Latest publications

• dos santos, Luiz F.G; Bose, Souvik; Salvatelli, Valentina; Neuberg, Brad; Cheung, M. C. M.; Janvier, Miho; Jin, Meng; Gal, Yarin; Boerner, Paul & Baydin, Atilim, Günes (2021). Multichannel autocalibration for the Atmospheric Imaging Assembly using machine learning. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  648(53) . doi: 10.1051/0004-6361/202040051 Full text in Research Archive.
• Rouppe van der Voort, L. H. M.; Joshi, Jayant; Henriques, V. M. J. & Bose, Souvik (2021). Signatures of ubiquitous magnetic reconnection in the deep atmosphere of sunspot penumbrae. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  648(54) . doi: 10.1051/0004-6361/202040171
• Bose, Souvik; Joshi, Jayant; Henriques, V. M. J. & Rouppe van der Voort, L. H. M. (2021). Spicules and downflows in the solar chromosphere. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  647(147) . doi: 10.1051/0004-6361/202040014
• Jafarzadeh, Shahin (2020). Waves in Slender Chromospheric Fibrils, In  The Science of EST.  Instituto de Astrofisica de Andalucia.  ISBN 978-84-09-20021-4.  Chapter.  s 72 - 72
• Jess, David B.; Keys, Peter H.; Stangalini, Marco & Jafarzadeh, Shahin (2020). High-resolution wave dynamics in the lower solar atmosphere. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.  ISSN 1364-503X.  379(20200169) . doi: 10.1098/rsta.2020.0169 Full text in Research Archive. Show summary

  The magnetic and convective nature of the Sun's photosphere provides a unique platform from which generated waves can be modelled, observed, and interpreted across a wide breadth of spatial and temporal scales. As oscillations are generated in-situ or emerge through the photospheric layers, the interplay between the rapidly evolving densities, temperatures, and magnetic field strengths provides dynamic evolution of the embedded wave modes as they propagate into the tenuous solar chromosphere. A focused science team was assembled to discuss the current challenges faced in wave studies in the lower solar atmosphere, including those related to spectropolarimetry and radiative transfer in the optically thick regions. Following the Theo Murphy international scientific meeting held at Chicheley Hall during February 2020, the scientific team worked collaboratively to produce 15 independent publications for the current Special Issue, which are introduced here. Implications from the current research efforts are discussed in terms of upcoming next-generation observing and high performance computing facilities.

• Rouppe van der Voort, Luc (2020). Spicules, In  The Science of EST.  Instituto de Astrofisica de Andalucia.  ISBN 978-84-09-20021-4.  4.
• Robinson, Rebecca Anne (2020). The Quiet Sun Magnetic Field, In  The Science of EST.  Instituto de Astrofisica de Andalucia.  ISBN 978-84-09-20021-4.  68.
• Nóbrega Siverio, Daniel Elias (2020). High-speed coronal jets, In  The Science of EST.  Instituto de Astrofisica de Andalucia.  ISBN 978-84-09-20021-4.  74.
• Armstrong, John A. & Fletcher, Lyndsay (2020). A machine-learning approach to correcting atmospheric seeing in solar flare observations. Monthly notices of the Royal Astronomical Society.  ISSN 0035-8711.  501(2), s 2647- 2658 . doi: 10.1093/mnras/staa3742 Full text in Research Archive.
• Hudson, Hugh S.; Simões, Paulo J. A.; Fletcher, Lyndsay; Hayes, Laura A. & Hannah, Iain G. (2020). Hot X-ray onsets of solar flares. Monthly notices of the Royal Astronomical Society.  ISSN 0035-8711.  501(1), s 1273- 1281 . doi: 10.1093/mnras/staa3664 Full text in Research Archive.
• Van Doorsselaere, Tom; Srivastava, Abhishek; Antolin, Patrick; Magyar, Norbert; Vasheghani Farahani, Soheil; Tian, Hui; Kolotkov, Dmitrii; Ofman, Leon; Guo, Mingzhe; Arregui, Iñigo; de Moortel, Ineke & Pascoe, David D. (2020). Coronal Heating by MHD Waves. Space Science Reviews.  ISSN 0038-6308.  216 . doi: 10.1007/s11214-020-00770-y Full text in Research Archive.
• Fyfe, L. E.; Howson, Thomas A. & de Moortel, Ineke (2020). Forward modelling of MHD waves in braided magnetic fields. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  643 . doi: 10.1051/0004-6361/202038945 Full text in Research Archive.
• Howson, Thomas A.; de Moortel, Ineke & Fyfe, L. E. (2020). The effects of driving time scales on heating in a coronal arcade. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  643 . doi: 10.1051/0004-6361/202038869 Full text in Research Archive.
• Pagano, P.; de Moortel, Ineke & Morton, R. J. (2020). Effect of coronal loop structure on wave heating through phase mixing. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  643 . doi: 10.1051/0004-6361/202039209 Full text in Research Archive.
• Howson, Thomas A.; de Moortel, Ineke & Reid, J. (2020). Phase mixing and wave heating in a complex coronal plasma. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  636 . doi: 10.1051/0004-6361/201937332 Full text in Research Archive.
• Van Damme, H. J.; de Moortel, Ineke; Pagano, P. & Johnston, Craig D. (2020). Chromospheric evaporation and phase mixing of Alfvén waves in coronal loops. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  635 . doi: 10.1051/0004-6361/201937266 Full text in Research Archive.
• Johnston, Craig D.; Cargill, P. J.; Hood, A. W.; de Moortel, Ineke; Bradshaw, S. J. & Vassekar, A. C. (2020). Modelling the solar transition region using an adaptive conduction method. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  635 . doi: 10.1051/0004-6361/201936979 Full text in Research Archive.
• Patel, Ritesh; Pant, Vaibhav; Kalugodu, Chandrashekhar & Banerjee, Dipankar (2020). A statistical study of plasmoids associated with a post-CME current sheet. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  644 . doi: 10.1051/0004-6361/202039000 Full text in Research Archive.
• Murabito, Mariarita; Ermolli, I.; Giorgi, F.; Stangalini, Marco; Guglielmino, S. L.; Jafarzadeh, Shahin; Socas-Navarro, Hector; Romano, Paolo & Zuccarello, Francesca (2020). The 3D structure of the penumbra at high resolution from the bottom of the photosphere to the middle chromosphere. Proceedings of the International Astronomical Union.  ISSN 1743-9213.  15(S354), s 448- 451 . doi: 10.1017/S1743921319010032 Full text in Research Archive.
• Houston, Scott J.; Jess, David B.; Keppens, Rony; Stangalini, Marco; Keys, Peter H.; Grant, Samuel D. T.; Jafarzadeh, Shahin; McFetridge, L. M.; Murabito, Mariarita; Ermolli, I. & Giorgi, F. (2020). Magnetohydrodynamic Nonlinearities in Sunspot Atmospheres: Chromospheric Detections of Intermediate Shocks. The Astrophysical Journal (ApJ).  ISSN 0004-637X.  892(1) . doi: 10.3847/1538-4357/ab7a90 Full text in Research Archive.
• Murabito, Mariarita; Ermolli, I.; Giorgi, F.; Stangalini, M.; Guglielmino, S. L.; Jafarzadeh, Shahin; Socas-Navarro, H.; Romano, P. & Zuccarello, F. (2020). The penumbral solar filaments from the photosphere to the chromosphere. Journal of Physics: Conference Series (JPCS).  ISSN 1742-6588.  1548 . doi: 10.1088/1742-6596/1548/1/012017 Full text in Research Archive.
• Jess, David B.; Snow, Ben; Fleck, Bernhard; Stangalini, Marco & Jafarzadeh, Shahin (2020). Reply to: Signatures of sunspot oscillations and the case for chromospheric resonances. Nature Astronomy.  ISSN 2397-3366.  5(1), s 5- 8 . doi: 10.1038/s41550-020-1158-4 Full text in Research Archive.
• Barnes, Will T.; Bobra, Monica G; Christe, Steven D; Freij, N.; Hayes, Laura A.; Ireland, Jack; Mumford, Stuart; Pérez-Suárez, David; Ryan, Daniel F.; Shih, Albert Y.; Chanda, Prateek; Glogowski, Kolja; Hewett, Russell J; Hughitt, V. Keith; Hill, Andrew; Hiware, Kaustubh; Inglis, Andrew; Kirk, Michael S. F.; Konge, Sudarshan; Mason, James Paul; Maloney, Shane Anthony; Murray, Sophie A.; Panda, Asish; Park, Jongyeob; Mendes Domingos Pereira, Tiago; Reardon, K.; Savage, Sabrina L.; Sipocz, Brigitta M.; Stansby, David; Jain, Yash; Taylor, Garrison; Yadav, Tannmay; Rajul, . & Dang, Trung Kien (2020). The SunPy Project: Open Source Development and Status of the Version 1.0 Core Package. The Astrophysical Journal (ApJ).  ISSN 0004-637X.  890(1) . doi: 10.3847/1538-4357/ab4f7a Full text in Research Archive.
• Criscuoli, Serena; Rempel, Matthias; Haberreiter, Margit; Mendes Domingos Pereira, Tiago; Uitenbroek, Han & Fabbian, Damian (2020). Comparing Radiative Transfer Codes and Opacity Samplings for Solar Irradiance Reconstructions. Solar Physics.  ISSN 0038-0938.  295(3) . doi: 10.1007/s11207-020-01614-2
• de Jorge Henriques, Vasco Manuel; Nelson, Chris J.; Rouppe van der Voort, Luc & Mathioudakis, Mihalis (2020). Umbral chromospheric fine structure and umbral flashes modelled as one: The corrugated umbra. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  642 . doi: 10.1051/0004-6361/202038538 Full text in Research Archive.
• Morton, Richard J.; Mooroogen, K & de Jorge Henriques, Vasco Manuel (2020). Transverse motions in sunspot super-penumbral fibrils. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.  ISSN 1364-503X.  379(2190) . doi: 10.1098/rsta.2020.0183 Full text in Research Archive.
• Stangalini, Marco; Baker, D.; Valori, G.; Jess, David B.; Jafarzadeh, Shahin; Murabito, M.; To, A. S. H.; Brooks, D. H.; Ermolli, I.; Giorgi, F. & MacBride, C. D. (2020). Spectropolarimetric fluctuations in a sunspot chromosphere. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.  ISSN 1364-503X.  379(2190) . doi: 10.1098/rsta.2020.0216 Full text in Research Archive.
• Gilchrist-Millar, Caitlin A.; Jess, David B.; Grant, Samuel D. T.; Keys, Peter H.; Beck, Christian; Jafarzadeh, Shahin; Riedl, Julia M.; Van Doorsselaere, Tom & Ruiz Cobo, Basilio (2020). Magnetoacoustic wave energy dissipation in the atmosphere of solar pores. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.  ISSN 1364-503X.  379(2190) . doi: 10.1098/rsta.2020.0172 Full text in Research Archive.
• Guevara Gomez, Juan Camilo; Jafarzadeh, Shahin; Wedemeyer, Sven; Szydlarski, Mikolaj Marcin; Stangalini, M.; Fleck, Bernhard & Keys, Peter H. (2020). High-frequency oscillations in small chromospheric bright features observed with Atacama Large Millimetre/Submillimetre Array. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.  ISSN 1364-503X.  379(2190) . doi: 10.1098/rsta.2020.0184 Full text in Research Archive.
• Eklund, Henrik; Wedemeyer, Sven; Snow, Ben; Jess, David B.; Jafarzadeh, Shahin; Grant, Samuel D. T.; Carlsson, Mats & Szydlarski, Mikolaj Marcin (2020). Characterization of shock wave signatures at millimetre wavelengths from Bifrost simulations. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.  ISSN 1364-503X.  379(2190) . doi: 10.1098/rsta.2020.0185 Full text in Research Archive.
• Fleck, Bernhard; Carlsson, Mats; Khomenko, Elena; Rempel, M.; Steiner, Oskar & Vigeesh, G. (2020). Acoustic-gravity wave propagation characteristics in three-dimensional radiation hydrodynamic simulations of the solar atmosphere. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.  ISSN 1364-503X.  379(2190) . doi: 10.1098/rsta.2020.0170 Full text in Research Archive.
• Jafarzadeh, Shahin; Wedemeyer, Sven; Fleck, Bernhard; Stangalini, M.; Jess, D. B.; Morton, R. J.; Szydlarski, Mikolaj Marcin; de Jorge Henriques, Vasco Manuel; Zhu, X.; Wiegelmann, T.; Guevara Gomez, Juan Camilo; Grant, Samuel D. T.; Chen, B.; Reardon, K. & White, S. M. (2020). An overall view of temperature oscillations in the solar chromosphere with ALMA. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.  ISSN 1364-503X.  379(2190) . doi: 10.1098/rsta.2020.0174 Full text in Research Archive.
• Eklund, Henrik; Wedemeyer, Sven; Szydlarski, Mikolaj Marcin; Jafarzadeh, Shahin & Guevara Gomez, Juan Camilo (2020). The Sun at millimeter wavelengths: II. Small-scale dynamic events in ALMA Band 3. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  644 . doi: 10.1051/0004-6361/202038250 Full text in Research Archive.
• Bryans, Paul; McIntosh, Scott W.; Brooks, David H. & De Pontieu, Bart Walter (2020). Investigating the Chromospheric Footpoints of the Solar Wind. Astrophysical Journal Letters.  ISSN 2041-8205.  905 . doi: 10.3847/2041-8213/abce69
• Guo, L.-J.; De Pontieu, Bart Walter; Huang, Y.-M.; Peter, Hardi & Bhattacharjee, A. (2020). Observations and Modeling of the Onset of Fast Reconnection in the Solar Transition Region. The Astrophysical Journal (ApJ).  ISSN 0004-637X.  901 . doi: 10.3847/1538-4357/abb2a7
• Warren, Harry P.; Reep, Jeffrey W.; Crump, Nicholas A.; Ugarte-Urra, Ignacio; Brooks, David H.; Winebarger, Amy R.; Savage, Sabrina L.; De Pontieu, Bart Walter; Peter, Hardi; Cirtain, Jonathan W.; Golub, Leon; Kobayashi, Ken; McKenzie, David; Morton, Richard; Rachmeler, Laurel A.; Testa, Paola; Tiwari, Sanjiv & Walsh, Robert (2020). Observation and Modeling of High-temperature Solar Active Region Emission during the High-resolution Coronal Imager Flight of 2018 May 29. The Astrophysical Journal (ApJ).  ISSN 0004-637X.  896(1) . doi: 10.3847/1538-4357/ab917c
• Brooks, David H.; Winebarger, Amy R.; Savage, Sabrina L.; Warren, Harry P.; De Pontieu, Bart Walter; Peter, Hardi; Cirtain, Jonathan W.; Golub, Leon; Kobayashi, Ken; McIntosh, Scott W.; McKenzie, David; Morton, Richard; Rachmeler, Laurel A.; Testa, Paola; Tiwari, Sanjiv & Walsh, Robert (2020). The Drivers of Active Region Outflows into the Slow Solar Wind. The Astrophysical Journal (ApJ).  ISSN 0004-637X.  894(2) . doi: 10.3847/1538-4357/ab8a4c
• Testa, Paola; Polito, Vanessa & De Pontieu, Bart Walter (2020). IRIS Observations of Short-term Variability in Moss Associated with Transient Hot Coronal Loops. The Astrophysical Journal (ApJ).  ISSN 0004-637X.  889(2) . doi: 10.3847/1538-4357/ab63cf
• da Silva Santos, João Manuel; de la Cruz Rodriguez, Jaime; White, S. M.; Leenaarts, Jorrit; Vissers, Gregal Joan Maria & Hansteen, Viggo (2020). ALMA observations of transient heating in a solar active region. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  643 . doi: 10.1051/0004-6361/202038755 Full text in Research Archive.
• Martinez-Sykora, Juan; Szydlarski, Mikolaj Marcin; Hansteen, Viggo & De Pontieu, Bart Walter (2020). On the Velocity Drift between Ions in the Solar Atmosphere. The Astrophysical Journal (ApJ).  ISSN 0004-637X.  900(2) . doi: 10.3847/1538-4357/ababa3
• Auchère, Frédéric; Andretta, V.; Antonucci, E.; Bach, N.; Battaglia, M.; Bemporad, Alberto; Berghmans, D.; Buchlin, Éric; Caminade, S.; Carlsson, Mats; Carlyle, J.; Cerullo, J. J.; Chamberlin, P. C.; Colaninno, R. C.; Davila, J. M.; De Groof, A.; Etesi, L.; Fahmy, S.; Fineschi, S.; Fludra, A.; Gilbert, Holly R.; Giunta, A.; Grundy, T.; Haberreiter, M.; Harra, Louise K.; Hassler, D. M.; Hirzberger, J.; Howard, R. A.; Hurford, G.; Kleint, L.; Kolleck, M.; Krucker, S.; Lagg, A.; Landini, F.; Long, D. M.; Lefort, J.; Lodiot, S.; Mampaey, B.; Maloney, S.; Marliani, F.; Martinez-Pillet, V.; McMullin, D. R.; Müller, Daniel; Nicolini, G.; Orozco Suarez, D.; Pacros, A.; Pancrazzi, M.; Parenti, S.; Peter, Hardi; Philippon, A.; Plunkett, S.; Rich, N.; Rochus, P.; Rouillard, A.; Romoli, M.; Sanchez, L.; Schüle, U.; Sidher, S.; Solanki, Sami K.; Spadaro, D.; St. Cyr, O. C.; Straus, T.; Tanco, I.; Teriaca, L.; Thompson, W. T.; del Toro Iniesta, J. C.; Verbeeck, C.; Vourlidas, A.; Watson, C.; Wiegelmann, T.; Williams, D.; Woch, J.; Zhukov, A. N. & Zouganelis, Iannis (2020). Coordination within the remote sensing payload on the Solar Orbiter mission. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  642 . doi: 10.1051/0004-6361/201937032 Full text in Research Archive.
• Anderson, Mark; Appourchaux, T.; Auchère, Frédéric; Aznar Cuadrado, R.; Barbay, J.; Baudin, F.; Beardsley, S.; Bocchialini, Karine; Borgo, B.; Bruzzi, D.; Buchlin, E.; Burton, G.; Büchel, V.; Caldwell, M.; Caminade, S.; Carlsson, Mats; Curdt, W.; Davenne, J.; Davila, J.; DeForest, C. E.; Del Zanna, Giulio; Drummond, D.; Dubau, J.; Dumesnil, C.; Dunn, G.; Eccleston, P.; Fludra, A.; Fredvik, Terje; Gabriel, A.; Giunta, A.; Gottwald, A.; Griffin, D.; Grundy, T.; Guest, S.; Gyo, M.; Haberreiter, M.; Hansteen, Viggo; Harrison, R.; Hassler, D. M.; Haugan, Stein Vidar Hagfors; Howe, C.; Janvier, M.; Klein, R.; Koller, S.; Kucera, T. A.; Kouliche, D.; Marsch, E.; Marshall, A.; Marshall, G.; Matthews, Sharon A.; McQuirk, C.; Meining, S.; Mercier, C.; Morris, N.; Morse, T.; Munro, G.; Parenti, S.; Pastor-Santos, C.; Peter, H.; Pfiffner, D.; Phelan, P.; Philippon, A.; Richards, A.; Rogers, K.; Sawyer, C.; Schlatter, P.; Schmutz, W.; Schüle, U.; Shaughnessy, B.; Sidher, S.; Solanki, Sami K.; Speight, R.; Spescha, M.; Szwec, N.; Tamiatto, C.; Teriaca, L.; Thompson, W.; Tosh, I.; Tustain, S.; Vial, J.-C.; Walls, B.; Waltham, N.; Wimmer-Schweingruber, Robert F.; Woodward, S.; Young, P.; De Groof, A.; Pacros, A.; Williams, D. & Müller, Daniel (2020). The Solar Orbiter SPICE instrument: An extreme UV imaging spectrometer. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  642 . doi: 10.1051/0004-6361/201935574 Full text in Research Archive.
• Frogner, Lars; Gudiksen, Boris Vilhelm & Bakke, Helle (2020). Accelerated particle beams in a 3D simulation of the quiet Sun. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  643 . doi: 10.1051/0004-6361/202038529 Full text in Research Archive. Show summary

  Context. Observational and theoretical evidence suggest that beams of accelerated particles are produced in flaring events of all sizes in the solar atmosphere, from X-class flares to nanoflares. Current models of these types of particles in flaring loops assume an isolated 1D atmosphere. Aims. A more realistic environment for modelling accelerated particles can be provided by 3D radiative magnetohydrodynamics codes. Here, we present a simple model for particle acceleration and propagation in the context of a 3D simulation of the quiet solar atmosphere, spanning from the convection zone to the corona. We then examine the additional transport of energy introduced by the particle beams. Methods. The locations of particle acceleration associated with magnetic reconnection were identified by detecting changes in magnetic topology. At each location, the parameters of the accelerated particle distribution were estimated from local conditions. The particle distributions were then propagated along the magnetic field, and the energy deposition due to Coulomb collisions with the ambient plasma was computed. Results. We find that particle beams originate in extended acceleration regions that are distributed across the corona. Upon reaching the transition region, they converge and produce strands of intense heating that penetrate the chromosphere. Within these strands, beam heating consistently dominates conductive heating below the bottom of the transition region. This indicates that particle beams qualitatively alter the energy transport even outside of active regions.

• Wedemeyer, Sven; Szydlarski, Mikolaj Marcin; de la Cruz Rodriguez, Jaime & Jafarzadeh, Shahin (2020). Observing the Sun with the Atacama Large Millimeter/submillimeter Array-from continuum to magnetic fields. Proceedings of the International Astronomical Union.  ISSN 1743-9213.  15(S354), s 24- 37 . doi: 10.1017/S1743921319009906
• de Moortel, Ineke; Falconer, Isobel & Stack, Robert (2020). Alfvén on heating by waves. Astronomy & Geophysics.  ISSN 1366-8781.  61(2), s 2.34- 2.39 . doi: 10.1093/astrogeo/ataa031 Full text in Research Archive.
• Müller, Daniel; St. Cyr, O. C.; Zouganelis, Ioannis; Gilbert, Holly R.; Marsden, R.; Nieves-Chinchilla, T.; Antonucci, E.; Auchère, Frédéric; Berghmans, D.; Horbury, T. S.; Howard, R. A.; Krucker, S.; Maksimovic, M.; Owen, Christopher J.; Rochus, P.; Rodriguez-Pacheco, J.; Romoli, M.; Solanki, Sami K.; Bruno, R.; Carlsson, Mats; Fludra, A.; Harra, Louise K.; Hassler, D.M.; Livi, S.; Louarn, Philippe; Peter, Hardi; Schüle, U.; Teriaca, L.; del Toro Iniesta, J. C.; Wimmer-Schweingruber, Robert F.; Marsch, E.; Velli, M.; De Groof, A.; Walsh, A. & Williams, D. (2020). The Solar Orbiter mission: Science overview. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  642 . doi: 10.1051/0004-6361/202038467 Full text in Research Archive.
• Hasegawa, Takahiro; Noda, Carlos Quintero; Shimizu, Toshifumi & Carlsson, Mats (2020). On the Formation of Lyman β and the O I 1027 and 1028 Å Spectral Lines. The Astrophysical Journal (ApJ).  ISSN 0004-637X.  900(1) . doi: 10.3847/1538-4357/aba95c
• Polito, Vanessa; De Pontieu, Bart Walter; Testa, Paola; Brooks, David H. & Hansteen, Viggo (2020). IRIS Observations of the Low-atmosphere Counterparts of Active Region Outflows. The Astrophysical Journal (ApJ).  ISSN 0004-637X.  903(1) . doi: 10.3847/1538-4357/abba1d
• González Manrique, Sergio Javier; Quintero Noda, Carlos; Kuckein, Christoph; Ruiz Cobo, Basilio & Carlsson, Mats (2020). Capabilities of bisector analysis of the Si I 10 827 Å line for estimating line-of-sight velocities in the quiet Sun. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  634 . doi: 10.1051/0004-6361/201937274 Full text in Research Archive.
• Bharti, L.; Sobha, B.; Quintero Noda, Carlos; Joshi, C. & Pandya, U. (2020). Chromospheric plasma ejection above a pore. Monthly notices of the Royal Astronomical Society.  ISSN 0035-8711.  493(2), s 3036- 3044 . doi: 10.1093/mnras/staa434 Full text in Research Archive.
• Rouppe van der Voort, Luc; De Pontieu, Bart Walter; Carlsson, Mats; de la Cruz Rodriguez, Jaime; Bose, Souvik; Chintzoglou, Georgios; Drews, Ainar; Froment, Clara; Gošić, Milan; Graham, David R.; Hansteen, Viggo; de Jorge Henriques, Vasco Manuel; Jafarzadeh, Shahin; Joshi, Jayant; Kleint, Lucia; Kohutova, Petra; Leifsen, Torben; Martinez-Sykora, Juan; Nóbrega Siverio, Daniel Elias; Ortiz, Ada; Mendes Domingos Pereira, Tiago; Popovas, Andrius; Quintero Noda, Carlos; Sainz Dalda, Alberto; Scharmer, Göran B.; Schmit, Donald; Scullion, Eamon; Skogsrud, Håkon; Szydlarski, Mikolaj Marcin; Timmons, R.; Vissers, Gregal Joan Maria; Woods, M. M. & Zacharias, Pia (2020). High-resolution observations of the solar photosphere, chromosphere, and transition region: A database of coordinated IRIS and SST observations. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  641 . doi: 10.1051/0004-6361/202038732 Full text in Research Archive.
• Joshi, Jayant; Rouppe van der Voort, Luc & de la Cruz Rodriguez, Jaime (2020). Signatures of ubiquitous magnetic reconnection in the lower solar atmosphere. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  641 . doi: 10.1051/0004-6361/202038769 Full text in Research Archive.
• Mondal, Surajit; Oberoi, Divya & Mohan, Atul (2020). First Radio Evidence for Impulsive Heating Contribution to the Quiet Solar Corona. Astrophysical Journal Letters.  ISSN 2041-8205.  895(2) . doi: 10.3847/2041-8213/ab8817
• Martinez-Sykora, Juan; De Pontieu, Bart Walter; de la Cruz Rodriguez, Jaime & Chintzoglou, Georgios (2020). The Formation Height of Millimeter-wavelength Emission in the Solar Chromosphere. Astrophysical Journal Letters.  ISSN 2041-8205.  891(1) . doi: 10.3847/2041-8213/ab75ac
• Schmit, Donald; De Pontieu, Bart Walter; Winebarger, Amy R.; Rachmeler, Laurel A. & Daw, A. (2020). Understanding the Structure of Rapid Intensity Fluctuations in the Chromosphere with IRIS. The Astrophysical Journal (ApJ).  ISSN 0004-637X.  889(2) . doi: 10.3847/1538-4357/ab5f6b
• Keys, Peter H.; Reid, Aaron L.; Mathioudakis, Mihalis; Shelyag, Sergey I.; de Jorge Henriques, Vasco Manuel; Hewitt, Rebecca L.; del Moro, Dario; Jafarzadeh, Shahin; Jess, David B. & Stangalini, Marco (2020). High-resolution spectropolarimetric observations of the temporal evolution of magnetic fields in photospheric bright points. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  633 . doi: 10.1051/0004-6361/201936545 Full text in Research Archive.
• Drews, Ainar & Rouppe van der Voort, Luc (2020). A multi-diagnostic spectral analysis of penumbral microjets. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  638 . doi: 10.1051/0004-6361/202037911 Full text in Research Archive.
• Gallagher, Andrew J.; Bergemann, Maria; Collet, Remo; Plez, Bertrand; Leenaarts, Jorrit; Carlsson, Mats; Yakovleva, Svetlana A. & Belyaev, Andrey K. (2020). Observational constraints on the origin of the elements: II. 3D non-LTE formation of Ba II lines in the solar atmosphere. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  634 . doi: 10.1051/0004-6361/201936104 Full text in Research Archive.
• da Silva Santos, João Manuel; de la Cruz Rodriguez, Jaime; Leenaarts, Jorrit; Chintzoglou, Georgios; De Pontieu, Bart Walter; Wedemeyer, Sven & Szydlarski, Mikolaj Marcin (2020). The multi-thermal chromosphere: Inversions of ALMA and IRIS data. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  634 . doi: 10.1051/0004-6361/201937117 Full text in Research Archive.
• Saberi, Maryam; Olofsson, Hans; Vlemmings, Wouter H.T.; de Beck, Elivire; Khouri, Theo & Ramstedt, Sofia (2020). CO and HCN isotopologue ratios in the outflows of AGB stars. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  638 . doi: 10.1051/0004-6361/202037668 Full text in Research Archive.
• Joshi, Reetika; Chandra, Ramesh; Schmieder, Brigitte; Moreno-Insertis, Fernando; Aulanier, Guillaume; Nóbrega Siverio, Daniel Elias & Devi, Pooja (2020). Case study of multi-temperature coronal jets for emerging flux MHD models. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  639 . doi: 10.1051/0004-6361/202037806 Full text in Research Archive.
• Reid, Aaron; Zhigulin, B.; Carlsson, Mats & Mathioudakis, Mihalis (2020). Chromospheric Bubbles in Solar Flares. Astrophysical Journal Letters.  ISSN 2041-8205.  894(2) . doi: 10.3847/2041-8213/ab8d1e
• Nóbrega Siverio, Daniel Elias; Martinez-Sykora, Juan; Moreno-Insertis, Fernando & Carlsson, Mats (2020). Ambipolar diffusion in the Bifrost code. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  638 . doi: 10.1051/0004-6361/202037809 Full text in Research Archive.
• Kohutova, Petra; Antolin, Patrick; Popovas, Andrius; Szydlarski, Mikolaj Marcin & Hansteen, Viggo (2020). Self-consistent 3D radiative magnetohydrodynamic simulations of coronal rain formation and evolution. Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  639 . doi: 10.1051/0004-6361/202037899 Full text in Research Archive.

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• de Jorge Henriques, Vasco Manuel (2021). The corrugated umbra model. Show summary

  The chromosphere of the umbra of sunspots is a remarkably dynamic layer featuring extremely fine sub-arcsec structure. Such structures appear dark against enveloping umbral flashes, but also bright before or after a flash, other features still are bright throughout. Only recently did we start understanding such fine features and semi-empirical modelling is converging with simulations to provide insight, not only into such fine structure, but also into the umbral flash phenomenon itself. The observational evidence weighs overwhelmingly towards a strong corrugation of the umbra where the material in short dynamic fibrils over-extends in a column of upflowing material while the adjacent areas flash. The delayed small-scale umbral brightenings at the bottom of such columns are an out-of-phase flash where the late-stage downflowing column meets the upflowing under-layers. Recent inversions using NICOLE at both umbral flashes and small-scale brightenings result in a downflow over upflow stratification perfectly bridging the transition of downflowing fibrils to upflowing fibrils as well as red-shifted absorption cores to blue-shifted absorption cores in the broader surroundings. Locally, each inverted column is remarkably similar in velocity profile to those from forward modelling, provided the formation height of the observed Ca II 8542 line is slightly lower in the Sun than in the simulations. Conspicuously, resonant cavities naturally cause the upper downflowing layers to become visible in forward modelling and the top-layer downflows to last longer than otherwise. Open questions, and how these can be addressed by future observations, are briefly discussed.

• Mohan, Atul (2021). Discovery of Correlated Evolution in Solar Noise Storm Source Parameters: Insights on Magnetic Field Dynamics during a Microflare. Astrophysical Journal Letters.  ISSN 2041-8205.  909(1), s L1 . doi: 10.3847/2041-8213/abe70a
• Mohan, Atul; McCauley, Patrick; Oberoi, Divya & Mastrano, Alpha (2021). Quasi-periodic particle acceleration episodes during a microflare.
• de Moortel, Ineke (2021). Our Dynamic Sun.
• Guevara Gomez, Juan Camilo & Wedemeyer, Sven (2021). Dynamics of small-scale dark features observed by the Atacama Large Millimeter/submillimeter Array (ALMA).
• White, Stephen; Barta, Miroslav; Bastian, Timothy; Shimojo, Masumi & Wedemeyer, Sven (2020). Correlator Desiderata for Solar Radiophysics at ALMA.
• Bose, Souvik; de Jorge Henriques, Vasco Manuel; Joshi, Jayant & Rouppe van der Voort, Luc (2020). Rapid Downflows in the solar chromosphere.
• Bose, Souvik (2020). Characterization of spicules in high resolution observations and simulations.
• Bose, Souvik; de Jorge Henriques, Vasco Manuel; Joshi, Jayant & Rouppe van der Voort, Luc (2020). Characterization and formation of on-disk spicules in the Ca II K and Mg II k spectral lines (Corrigendum). Astronomy and Astrophysics (A & A).  ISSN 0004-6361.  637 . doi: https://doi.org/10.1051/0004-6361/201936617e
• Nordlund, Åke (2020). The DISPATCH Code Framework; Tutorial / HandsOn.
• Nordlund, Åke (2020). DISPATCH: A Code Framework for Exascale Computing.
• Saberi, Maryam (2020). UV chemistry in the circumstellar envelopes around evolved stars.
• Jafarzadeh, Shahin (2020). Magneto-acoustic Waves in the Lower Solar Atmosphere at High Resolution.
• Mohan, Atul; McCauley, Patrick; Oberoi, Divya; Mondal, Surajit & Mastrano, Alpha (2020). New insights on weak coronal events from HDR snapshot spectroscopic imaging at meter-wavebands.
• Jafarzadeh, Shahin (2020). Observing Waves in the Lower Solar Atmosphere with ALMA.
• Jafarzadeh, Shahin (2020). Waves in the Lower Solar Atmosphere.
• Eklund, Henrik; Szydlarski, Mikolaj Marcin & Wedemeyer, Sven (2020). Image reconstruction of interferometric ALMA data.
• de Moortel, Ineke; Howson, Tom; Pagano, Paolo & Van Damme, Hendrik-Jan (2020). Aspects of MHD wave heating in the complex solar atmosphere.
• de Moortel, Ineke (2020). Our 21st Century Sun.
• de Moortel, Ineke; Howson, Tom; Pagano, Paolo; Morton, Richard & Reid, Jack (2020). Aspects of MHD wave heating in the complex solar atmosphere.
• de Moortel, Ineke (2020). Our Dynamic Sun, Solar Storms and Atmospheric Effects on Earth's Communities.
• Hansteen, Viggo (2020). IRIS: heating of the solar chromosphere, Ellerman Bombs and UV bursts.
• Narang, Nancy (2020). What causes high-frequency oscillations in active region moss: Waves or/and Reconnection?. Show summary

  The high temporal, spatial and spectral resolution of Interface Region Imaging Spectrograph (IRIS) has provided new insights into the understanding of different small-scale processes occurring at the chromospheric and transition region heights. I will present a study of the dynamics of high-frequency oscillations of an active region (AR 2376) moss as recorded by simultaneous imaging and spectral data of IRIS. Wavelet transformations and power maps from slit-jaw images in Si IV 1400 Å passband, and sit-and-stare spectroscopic observations of Si IV 1403 Å spectral line reveal the presence of high-frequency oscillations with ~1-2 minutes periods in the bright moss regions. The presence of such low periodicities is further confirmed by intrinsic mode functions (IMFs) as obtained by empirical mode decomposition (EMD) technique. I will show the evidence of the presence of slow waves and reconnection-like events, and that together they cause the high-frequency oscillations in the bright moss regions.

• de Jorge Henriques, Vasco Manuel (2020). Vamos conhecer melhor o Sol.
• Nóbrega Siverio, Daniel Elias (2020). Surges: a fundamental piece in the solar atmosphere puzzle.
• Nóbrega Siverio, Daniel Elias (2020). MHD simulations of jets and surges in the solar atmosphere.
• Nóbrega Siverio, Daniel Elias (2020). Solar surges related to UV bursts: characterization through density diagnostics, k-means, and inversions.
• Carlsson, Mats (2020). Solar storms: wildest weather in the solar system.
• Carlsson, Mats (2020). Solen, din nærmeste stjerne.
• Carlsson, Mats (2020). Solar storms: wildest weather in the solar system.
• Carlsson, Mats (2020). Radyn.
• Gudiksen, Boris Vilhelm; Frogner, Lars; Bakke, Helle & Clemmensen, Frederik (2020). Accelerated particles in the solar atmosphere.
• Gudiksen, Boris Vilhelm; Frogner, Lars & Bakke, Helle (2020). Accelerated particles in the solar atmosphere.
• Gudiksen, Boris Vilhelm (2020). Our active Sun.
• Frogner, Lars (2020). Accelerated particles in the solar atmosphere.
• Wedemeyer, Sven (2020). Development of tools for solar research with ALMA at RoCS.

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