Sven Wedemeyer

Førsteamanuensis - Rosseland senter for solfysikk

English version of this page

E-post sven.wedemeyer@astro.uio.no

Telefon +47 22856520

Rom 203

Brukernavn

Besøksadresse Sem Sælands vei 13 Svein Rosselands hus 0371 OSLO

Postadresse Postboks 1029 0315 OSLO

Pressebilde Last ned visittkort

Primary research fields

Solar and stellar physics with additional interests in extra-solar planets. Most of my individual projects can be summarized as realistic numerical simulations in comparison with space-borne and ground-based observations.

Main current positions and functions

Associate Professor (permanent staff) and among the PIs of the Rosseland Centre for Solar Physics (RoCS, since 2017), a centre of excellence funded by the Research Council of Norway
PI of the ERC-funded SolarALMA project (since 2016)
PI of the EMISSA project (funded by the Research Council of Norway)
PI of the ESO-funded ALMA Development Study High-Cadence Imaging of the Sun
Member of the European Scientific Advisory Committee (ESAC) for ALMA (ESO, since 2017)
Norwegian representative at the Observing Programme Committee (OPC) of the Nordic Optical Telescope (NOT)
Initiator and co-ordinator of the SSALMON research network with more than 80 researchers (since 2014)
External staff member of the ALMA Regional Center at Ondrejoy, Czech Republic

Current major research activities

Solar/Stellar Science with the Atacama Large Millimeter Array

The ERC-funded SolarALMA project runs from 2016 to 2021 and aims at utilizing ALMA for detailed studies of the solar chromosphere with particular focus on the coronal heating problem.
The ESO-funded ALMA Development Study aims at improving and developing solar observing modes.
The EMISSA project (funded by the Research Council of Norway) addresses solar and stellar activity as observed with ALMA, supported by numerical simulation.
International team for developing solar observing modes for ALMA, as combination of the previous project "Advanced Solar Observing Techniques" within the North American Study Plan for Development Upgrades of the ALMA (PI: T. Bastian, NRAO, USA) and the project "Solar Research with ALMA" carried out at the Czech node of the European ALMA Regional Center (EU ARC at Ondrejov, Czech Republic) in the frame of the ESO program "Enhancement of ALMA Capabilities/EoC" (PI: R. Brajsa, Hvar Observatory, Croatia).
SSALMON - The Solar Simulations for the Atacama Large Millimeter Observatory Network (since 2014).

Small-scale dynamics and energy balance of the solar atmosphere

International Team The nature and physics of vortex flows in solar plasmas (funded by the International Space Science Institute (ISSI) Bern, Switzerland, since 2018).

Host stars of extrasolar planets

Member of KOINet - Observations of extrasolar planets (Kepler Objects of Interest), amongst others with the Nordic Optical Telescope (since 2014)
Extreme Precision Radial Velocity group (EPRV, NASA/NSF, since 2019)
NASA’s EXOPAG SAG 21 on “The Effect of Stellar Contamination on Space-based Transmission Spectroscopy” (since 2020)

Previous research

After finishing my PhD studies at the University of Kiel, Germany, which includes a stay at the University of Glasgow, UK, I was a post-doctoral research fellow at the Kiepenheuer Institute in Freiburg i.Br., Germany (2003-06). After receiving a Marie Curie Intra-European Fellowship, I started working at the Institute of Theoretical Astrophysics at the University of Oslo. During the recent years, I have been the PI of the MDWARF project and the VORTEX project, both funded by the Research Council of Norway.

Recent research highlights include the discovery and explanation of so-called magnetic tornadoes on the Sun, featured on the front page of Nature in 2012, and the ongoing development of methods for observing the Sun with the Atacama Large Millimeter/submillimeter Array, an application with potentially high impact for our understanding of the outer layers of our Sun and other stars.

Previous major research activities (in part ongoing)

"Vortex flows and magnetic tornadoes on the Sun and cool stars"
Funded by the Research Council of Norway in the highly competitive FRIPRO/FRINATEK program for the period 2013-2017.
Click here for the official ITA project page.
"Magnetic Activity of the Atmospheres of M-type Dwarf Stars"
Funded by the Research Council of Norway in the Space Science for the period 2012-2014. Further work based on the project results still ongoing.
Click here for the official ITA project page.
"Magnetic Activity of M-type Dwarf Stars and the Influence on Habitable Extra-solar Planets"
International Team funded by the International Space Science Institute (ISSI) in Bern, Switzerland (since 2012).
Click here for the official team home page at ISSI, Bern.

Emneord: Astronomi og astrofysikk, Solfysikk, Atacama Large Millimeter/submillimeter Array (ALMA), Solens kromosfære, Simulering, Stjerner, Extrasolar Planets, Nordisk Optisk Teleskop

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 Fulltekst i vitenarkiv.
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 Fulltekst i vitenarkiv.
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 Fulltekst i vitenarkiv.
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 Fulltekst i vitenarkiv.
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 Fulltekst i vitenarkiv.
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
Wedemeyer, Sven; Szydlarski, Mikolaj Marcin; Jafarzadeh, Shahin; Eklund, Henrik; Guevara Gomez, Juan Camilo; Bastian, Tim; Fleck, Bernhard; de la Cruz Rodriguez, Jaime; Rodger, Andrew & Carlsson, Mats (2020). The Sun at millimeter wavelengths: I. Introduction to ALMA Band 3 observations. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 635 . doi: 10.1051/0004-6361/201937122 Fulltekst i vitenarkiv.
Freudenthal, J.; von Essen, Carolina; Ofir, A.; Dreizler, S.; Agol, E.; Wedemeyer, Sven; Morris, B. M.; Becker, A. C.; Deeg, H. J.; Hoyer, S.; Mallonn, M.; Poppenhaeger, K.; Herrero, E.; Ribas, I.; Boumis, P. & Liakos, A. (2019). Kepler Object of Interest Network: III. Kepler-82f: a new non-transiting 21 M⊕ planet from photodynamical modelling. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 628 . doi: 10.1051/0004-6361/201935879 Fulltekst i vitenarkiv.
Jafarzadeh, Shahin; Wedemeyer, Sven; Szydlarski, Mikolaj Marcin; De Pontieu, Bart Walter; Rezaei, Rezza & Carlsson, Mats (2019). The solar chromosphere at millimetre and ultraviolet wavelengths: I. Radiation temperatures and a detailed comparison. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 622 . doi: 10.1051/0004-6361/201834205 Fulltekst i vitenarkiv.
Rodger, Andrew S.; Labrosse, Nicolas; Wedemeyer, Sven; Szydlarski, Mikolaj Marcin; Simões, Paulo J. A. & Fletcher, Lyndsay (2019). First Spectral Analysis of a Solar Plasma Eruption Using ALMA. The Astrophysical Journal (ApJ). ISSN 0004-637X. 875(2) . doi: 10.3847/1538-4357/aafdfb Fulltekst i vitenarkiv.
Shetye, Juie; Verwichte, Erwin; Stangalini, Marco; Judge, Philip G.; Doyle, J. G.; Arber, Tony; Scullion, Eamon & Wedemeyer, Sven (2019). Multiwavelength High-resolution Observations of Chromospheric Swirls in the Quiet Sun. The Astrophysical Journal (ApJ). ISSN 0004-637X. 881(1) . doi: 10.3847/1538-4357/ab2bf9 Fulltekst i vitenarkiv.
von Essen, Carolina; Wedemeyer, Sven; Sosa, M. S.; Hjorth, M.; Parkash, V.; Freudenthal, J.; Mallonn, M.; Miculán, R. G.; Zibecchi, L.; Cellone, S. & Torres, A. F. (2019). Indications for transit-timing variations in the exo-Neptune HAT-P-26b. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 628 . doi: 10.1051/0004-6361/201731966 Fulltekst i vitenarkiv.
Bastian, Timothy; Barta, Miroslav; Brajša, Roman; Chen, Bin; De Pontieu, Bart Walter; Gary, D. E.; Fleishman, G.; Hales, Antonio; Iwai, K; Hudson, Hugh; Kim, S; Kobelski, A.; Loukitcheva, Maria; Shimojo, Masumi; Skokić, I.; Wedemeyer, Sven; White, Stephen & Yan, Y (2018). Exploring the Sun with ALMA. The Messenger. ISSN 0722-6691. 171, s 25- 30 Fulltekst i vitenarkiv.
Brajša, R.; Sudar, D.; Benz, A. O.; Skokić, I.; Bárta, M.; De Pontieu, Bart Walter; Kim, S.; Kobelski, A.; Kuhar, M.; Shimojo, M.; Wedemeyer, Sven; White, S.; Yagoubov, P. & Yan, Y. (2018). First analysis of solar structures in 1.21 mm full-disc ALMA image of the Sun. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 613 . doi: 10.1051/0004-6361/201730656 Fulltekst i vitenarkiv.
Freudenthal, Jantje; von Essen, Carolina; Dreizler, Stefan; Wedemeyer, Sven; Agol, Eric; Morris, Brett M.; Becker, Andrew C.; Mallonn, Matthias; Hoyer, Sergio; Ofir, Aviv; Tal-Or, Lev; Deeg, Hans Jörg; Herrero, Enrique; Ribas, Ignasi; Khalafinejad, Sara; Hernández, Jesús V. & Rodríguez, Silvio M.M. (2018). Kepler Object of Interest Network: II. Photodynamical modelling of Kepler-9 over 8 years of transit observations. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 618 . doi: 10.1051/0004-6361/201833436 Fulltekst i vitenarkiv.
Klevas, J.; Kučinskas, A.; Wedemeyer, Sven & Ludwig, H.-G. (2018). Impact of magnetic fields on the structure of convective atmospheres of red giant stars. Contributions of the Astronomical Observatory Skalnate Pleso. ISSN 1335-1842. 48(1), s 280- 281 Fulltekst i vitenarkiv.
Nindos, A.; Alissandrakis, C. E.; Bastian, T. S.; Patsourakos, S.; De Pontieu, Bart Walter; Warren, H.; Ayres, T.; Hudson, H. S.; Shimizu, T.; Vial, J.-C.; Wedemeyer, Sven & Yurchyshyn, V. (2018). First high-resolution look at the quiet Sun with ALMA at 3mm. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 619 . doi: 10.1051/0004-6361/201834113 Fulltekst i vitenarkiv.
von Essen, Carolina; Ofir, A.; Dreizler, S.; Agol, E.; Freudenthal, J.; Hernández, J.; Wedemeyer, Sven; Parkash, V.; Deeg, H. J.; Hoyer, S.; Morris, B. M.; Becker, A. C.; Sun, L.; Gu, S. H.; Herrero, E.; Tal-Or, L.; Poppenhaeger, K.; Mallonn, M.; Albrecht, S.; Khalafinejad, S.; Boumis, P.; Delgado-Correal, C.; Fabrycky, D. C.; Janulis, R.; Lalitha, S.; Liakos, A.; Mikolaitis, Š.; Moyano D’Angelo, M. L.; Sokov, E.; Pakštienė, E.; Popov, A.; Krushinsky, V.; Ribas, I.; Rodríguez S., M. M.; Rusov, S.; Sokova, I.; Tautvaišienė, G. & Wang, X. (2018). Kepler Object of Interest Network: I. First results combining ground- and space-based observations of Kepler systems with transit timing variations. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 615 . doi: 10.1051/0004-6361/201732483 Fulltekst i vitenarkiv.
Kato, Yoshiaki & Wedemeyer, Sven (2017). Vortex flows in the solar chromosphere: I. Automatic detection method. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 601 . doi: 10.1051/0004-6361/201630082 Fulltekst i vitenarkiv.
Klevas, Jonas; Wedemeyer, Sven; Kucinskas, Arunas & Ludwig, Hans-Günter (2017). 3D hydrodynamical COBOLD simulations of a chromosphere of a red giant. MEMORIE della Società Astronomica Italiana. ISSN 0037-8720. 88(1), s 100- 103 . doi: 10.1051/0004-6361/201730405
Shimojo, M.; Bastian, T. S.; Hales, A. S.; White, S. M.; Iwai, K.; Hills, R. E.; Hirota, A.; Phillips, N. M.; Sawada, T.; Yagoubov, P.; Siringo, G.; Asayama, S.; Sugimoto, M.; Brajša, Roman; Skokic, I.; Barta, M.; Kim, S.; de Gregorio-Monsalvo, I.; Corder, S. A.; Hudson, H. S.; Wedemeyer, Sven; Gary, D. E.; De Pontieu, Bart Walter; Loukitcheva, M.; Fleishman, G. D.; Chen, B.; Kobelski, A. & Yan, Y. (2017). Observing the Sun with the Atacama Large Millimeter/submillimeter Array (ALMA): High-Resolution Interferometric Imaging. Solar Physics. ISSN 0038-0938. 292(7) . doi: 10.1007/s11207-017-1095-2 Fulltekst i vitenarkiv.
Wedemeyer, Sven; Kučinskas, Arūnas; Klevas, Jonas & Ludwig, Hans-Günter (2017). Three-dimensional hydrodynamical CO5BOLD model atmospheres of red giant stars: VI. First chromosphere model of a late-type giant. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 606 . doi: 10.1051/0004-6361/201730405 Fulltekst i vitenarkiv.
White, S. M.; Iwai, K.; Phillips, N. M.; Hills, R. E.; Hirota, A.; Yagoubov, P.; Siringo, G.; Shimojo, M.; Bastian, T. S.; Hales, A. S.; Sawada, T.; Asayama, S.; Sugimoto, M.; Marson, R. G.; Kawasaki, W.; Muller, E.; Nakazato, T.; Sugimoto, K.; Brajša, Roman; Skokic, I.; Barta, M.; Kim, S.; Remijan, A.; de Gregorio, I.; Corder, S. A.; Hudson, H. S.; Loukitcheva, M.; Chen, B.; De Pontieu, Bart Walter; Fleishmann, G. D.; Gary, D. E.; Kobelski, A.; Wedemeyer, Sven & Yan, Y. (2017). Observing the Sun with the Atacama Large Millimeter/submillimeter Array (ALMA): Fast-Scan Single-Dish Mapping. Solar Physics. ISSN 0038-0938. 292(7) . doi: 10.1007/s11207-017-1123-2 Fulltekst i vitenarkiv.
Kato, Yoshiaki; Steiner, Oskar; Hansteen, Viggo; Gudiksen, Boris Vilhelm; Wedemeyer, Sven & Carlsson, Mats (2016). Chromospheric and Coronal Wave Generation in a Magnetic Flux Sheath. The Astrophysical Journal (ApJ). ISSN 0004-637X. 827(1) . doi: 10.3847/0004-637X/827/1/7
Scullion, Eamon; Rouppe, Van Der Voort Luc; Antolin, Patrick; Wedemeyer, Sven; Vissers, Gregal Joan Maria; Kontar, E. P. & Gallagher, P. T. (2016). Observing the Formation of Flare-Driven Coronal Rain. The Astrophysical Journal (ApJ). ISSN 0004-637X. 833(2) . doi: 10.3847/1538-4357/833/2/184
Wedemeyer, Sven; Bastian, T.; Brajsa, R.; Hudson, H.; Fleishman, G.; Loukitcheva, M.; Fleck, B.; Kontar, Eduard P.; De Pontieu, Bart Walter; Yagoubov, P.; Tiwari, S. K.; Soler, R.; Black, J. H.; Antolin, Patrick; Scullion, Eamon; Gunar, S.; Labrosse, N.; Ludwig, H.-G.; Benz, A. O.; White, S. M.; Hauschildt, P.; Doyle, J. G.; Nakariakov, V. M.; Ayres, T.; Heinzel, P.; Karlicky, M.; Van Doorsselaere, Tom; Gary, D.; Alissandrakis, C. E.; Nindos, A.; Solanki, S. K.; Rouppe, Van Der Voort Luc; Shimojo, M.; Kato, Yoshiaki; Zaqarashvili, T.; Perez, E.; Selhorst, C. L. & Barta, M. (2016). Solar Science with the Atacama Large Millimeter/Submillimeter Array—A New View of Our Sun. Space Science Reviews. ISSN 0038-6308. 200(1), s 1- 73 . doi: 10.1007/s11214-015-0229-9
Wedemeyer, Sven & Ludwig, Hans-Günter (2016). Synthetic activity indicators for M-type dwarf stars. Proceedings of the International Astronomical Union. ISSN 1743-9213. 11(S320), s 303- 308 . doi: 10.1017/S1743921316000077
Phillips, Neil; Hills, Richard; Bastian, Timothy; Hudson, Hugh; Marson, Ralph & Wedemeyer, Sven (2015). Fast single-dish scans of the Sun using ALMA. Astronomical Society of the Pacific Conference Series. ISSN 1050-3390. 499, s 347- 348
Tremblay, P. E.; Fontaine, G.; Freytag, B.; Steiner, O.; Ludwig, Hans-Günter; Steffen, M.; Wedemeyer, Sven & Brassard, P. (2015). ON the EVOLUTION of MAGNETIC WHITE DWARFS. The Astrophysical Journal (ApJ). ISSN 0004-637X. 812(1) . doi: 10.1088/0004-637X/812/1/19
Wedemeyer, Sven; Bastian, Timothy; Brajša, Roman; Barta, Miroslav; Hudson, Hugh; Fleishman, Gregory; Loukitcheva, Maria; Fleck, Bernhard; Kontar, Eduard P.; De Pontieu, Bart Walter; Tiwari, Sanjew; Kato, Yoshiaki; Soler, Roberto; Yagoubov, Pavel; Black, John; Antolin, Patrick; Gunar, Stanislav; Labrosse, Nicolas; Benz, Arnold; Nindos, Alexander; Steffen, Matthias; Scullion, Eamon Michael; Doyle, Gerry; Zaqarashvili, Teimuraz; Hanslmeier, Arnold; Nakariakov, Valery; Heinzel, Petr; Ayres, Thomas & Karlicky, Marian (2015). SSALMON - The Solar Simulations for the Atacama Large Millimeter Observatory Network. Advances in Space Research. ISSN 0273-1177. 56(12), s 2679- 2692 . doi: 10.1016/j.asr.2015.05.027
Wedemeyer, Sven; Bastian, Timothy; Brajša, Roman; Barta, Miroslav & Shimojo, Masumi (2015). Solar Simulations for the Atacama Large Millimeter Observatory Network. Astronomical Society of the Pacific Conference Series. ISSN 1050-3390. 499, s 341- 342
Wedemeyer, Sven; Bastian, Timothy; Brajša, Roman; Barta, Miroslav; Shimojo, Masumi; Hales, Antonio; Yagoubov, Pavel & Hudson, Hugh (2015). Solar ALMA Observations - A new view of our host star. Astronomical Society of the Pacific Conference Series. ISSN 1050-3390. 499, s 345- 346
Wedemeyer, Sven & Parmer, Asbjørn Lie (2015). ALMA's high-cadence imaging capabilities for solar observations. Astronomical Society of the Pacific Conference Series. ISSN 1050-3390. 499, s 343- 344
Freij, N.; Scullion, Eamon; Nelson, C. J.; Mumford, S.; Wedemeyer-Böhm, Sven & Erdélyi, R. (2014). The detection of upwardly propagating waves channeling energy from the chromosphere to the low corona. The Astrophysical Journal (ApJ). ISSN 0004-637X. 791(1) . doi: 10.1088/0004-637X/791/1/61 Fulltekst i vitenarkiv.
Scullion, Eamon; Rouppe, Van Der Voort Luc; Wedemeyer-Böhm, Sven & Antolin, Patrick (2014). Unresolved Fine-Scale Structure in Solar Coronal Loop-Tops. The Astrophysical Journal (ApJ). ISSN 0004-637X. 797(1) . doi: 10.1088/0004-637X/797/1/36 Fulltekst i vitenarkiv.
Wedemeyer-Böhm, Sven & Steiner, Oskar (2014). On the plasma flow inside magnetic tornadoes on the Sun. Publications of the Astronomical Society of Japan (PASJ). ISSN 0004-6264. 66(1) . doi: 10.1093/pasj/psu086
Wedemeyer-Böhm, Sven; Scullion, Eamon; Steiner, Oskar; de la Cruz Rodriguez, Jaime & Rouppe, Van Der Voort Luc (2013). Magnetic tornadoes and chromospheric swirls - Definition and classification. Journal of Physics: Conference Series (JPCS). ISSN 1742-6588. 440(1) . doi: 10.1088/1742-6596/440/1/012005
Ayres, T. R.; Lyons, J. R.; Ludwig, Hans-Günter; Caffau, E. & Wedemeyer-Böhm, Sven (2013). IS THE SUN LIGHTER THAN THE EARTH? ISOTOPIC CO IN THE PHOTOSPHERE, VIEWED THROUGH THE LENS OF THREE-DIMENSIONAL SPECTRUM SYNTHESIS. The Astrophysical Journal (ApJ). ISSN 0004-637X. 765(1) . doi: 10.1088/0004-637X/765/1/46
Ayres, T. R.; Lyons, J. R.; Ludwig, Hans-Günter; Caffau, E. & Wedemeyer-Böhm, Sven (2013). Solar carbon monoxide: poster child for 3D effects. Memorie della Societa Astronomica Italiana Supplement. ISSN 1824-0178. 24, s 85- 95
Wedemeyer-Böhm, Sven (2013). The CO5BOLD analysis tool. Memorie della Societa Astronomica Italiana Supplement. ISSN 1824-0178. 24, s 96- 99
Wedemeyer-Böhm, Sven; Ludwig, Hans-Günter & Steiner, Oskar (2013). Three-dimensional magnetohydrodynamic simulations of M-dwarf chromospheres. Astronomical Notes - Astronomische Nachrichten. ISSN 0004-6337. 334(1-2), s 137- 140 . doi: 10.1002/asna.201211741
Wedemeyer-Böhm, Sven; Scullion, Eamon; Rouppe, Van Der Voort Luc; Bosnjak, Antonija & Antolin, Patrick (2013). Are Giant Tornadoes the Legs of Solar Prominences?. The Astrophysical Journal (ApJ). ISSN 0004-637X. 774(2) . doi: 10.1088/0004-637X/774/2/123
Freytag, Bernd; Steffen, Matthias; Ludwig, Hans-Günter; Wedemeyer-Böhm, Sven; Schaffenberger, Werner & Steiner, Oskar (2012). Simulations of stellar convection with CO5BOLD. Journal of Computational Physics. ISSN 0021-9991. 231(3), s 919- 959 . doi: 10.1016/j.jcp.2011.09.026
Wedemeyer-Böhm, Sven; Scullion, Eamon; Steiner, O.; Rouppe, Van Der Voort Luc; de la Cruz Rodriguez, Jaime; Fedun, V. & Erdélyi, R. (2012). Magnetic tornadoes as energy channels into the solar corona. Nature. ISSN 0028-0836. 486(7404), s 505- 508 . doi: 10.1038/nature11202
Wedemeyer-Böhm, Sven & Carlsson, Mats (2011). Non-equilibrium calcium ionisation in the solar atmosphere. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 528 . doi: 10.1051/0004-6361/201016186
Haberreiter, Margit; Finsterle, W; McIntosh, S.W. & Wedemeyer-Böhm, Sven (2010). Toward the analysis of waves in the solar atmosphere based on NLTE spectral synthesis from 3D MHD simulations. MEMORIE della Società Astronomica Italiana. ISSN 0037-8720. 81, s 782- 785
Kjeldseth-Moe, Olav & Wedemeyer-Böhm, Sven (2010). Are there variations in Earth's global mean temperature related to the solar activity?. Proceedings of the International Astronomical Union. ISSN 1743-9213. 5, s 320- 325 . doi: 10.1017/S1743921309992869
Wedemeyer-Böhm, Sven (2010). Small-scale structure and dynamics of the chromospheric magnetic field. MEMORIE della Società Astronomica Italiana. ISSN 0037-8720. 81, s 693- 700
Wöger, Friedrich; Wedemeyer-Böhm, Sven; Uitenbroek, H. & Rimmele, T. R. (2010). Recovering the line-of-sight magnetic field in the chromosphere from Ca II IR spectra. MEMORIE della Società Astronomica Italiana. ISSN 0037-8720. 81, s 598- 603
Wedemeyer-Böhm, Sven; Lagg, Andreas & Nordlund, Åke (2009). Coupling from the Photosphere to the Chromosphere and the Corona. Space Science Reviews. ISSN 0038-6308. 144(1-4), s 317- 350 . doi: 10.1007/s11214-008-9447-8
Wedemeyer-Böhm, Sven & Rouppe, Van Der Voort Luc (2009). On the continuum intensity distribution of the solar photosphere. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 503(1), s 225- 239 . doi: 10.1051/0004-6361/200911983
Wedemeyer-Böhm, Sven & Rouppe, Van Der Voort Luc (2009). Small-scale swirl events in the quiet Sun chromosphere. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 507(1), s L9- L12 . doi: 10.1051/0004-6361/200913380
Wedemeyer-Böhm, Sven & Rouppe, Van Der Voort Luc (2009). The solar continuum intensity distribution. Settling the conflict between observations and simulations. MEMORIE della Società Astronomica Italiana. ISSN 0037-8720. 80
Wöger, Friedrich; Wedemeyer-Böhm, Sven; Uitenbroek, H. & Rimmele, T. R. (2009). MORPHOLOGY AND DYNAMICS OF THE LOW SOLAR CHROMOSPHERE. The Astrophysical Journal (ApJ). ISSN 0004-637X. 706(1), s 148- 157 . doi: 10.1088/0004-637X/706/1/148
Wedemeyer-Böhm, Sven & Wöger, Friedrich (2008). Small-scale structure and dynamics of the lower solar atmosphere, In R. Erdélyi & C. A. Mendoza-Briceno (ed.), Waves and Oscillations in the Solar Atmosphere: Heating and Magneto-Seismology. Cambridge University Press. ISBN 0-521-874696. Chapter. s 66 - 73
Steiner, Oskar; Rezaei, Rezza; Schaffenberger, Werner & Wedemeyer-Böhm, Sven (2008). The Horizontal Internetwork Magnetic Field: Numerical Simulations in Comparison to Observations with Hinode. The Astrophysical Journal (ApJ). ISSN 0004-637X. 680(1), s L85- L88
Wedemeyer-Böhm, Sven (2008). Point spread functions for the Solar optical telescope onboard Hinode. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 487, s 399- 412 . doi: 10.1051/0004-6361:200809819
Wedemeyer-Böhm, Sven; Lagg, Andreas & Nordlund, Åke (2008). Coupling from the photosphere to the chromosphere and the corona. Space Science Reviews. ISSN 0038-6308. OnlineFirst . doi: 10.1007/s11214-008-9447-8
Leenaarts, Jorrit; Wedemeyer-Böhm, Sven; Carlsson, Mats Per-Olof & Hansteen, Viggo (2007). Non-equilibrium Hydrogen Ionization in the Solar Atmosphere, In Petr Heinzel; Ivan Dorotovic & Robert Rutten (ed.), The Physics of Chromospheric Plasmas. Astronomical Society of the Pacific. ISBN 978-1-583812-36-5. 368. s 103 - 106
Rezaei, R.; Steiner, O.; Wedemeyer-Böhm, Sven; Schlichenmaier, R.; Schmidt, W. & Lites, B.W. (2007). Hinode observations reveal boundary layers of magnetic elements in the solar photosphere. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 476, s L33- L36 . doi: 10.1051/0004-6361:20078371
Steiner, O.; Vigeesh, G.; Krieger, L.; Wedemeyer-Böhm, Sven; Schaffenberger, W. & Freytag, B. (2007). First local helioseismic experiments with CO(5)BOLD. Astronomical Notes - Astronomische Nachrichten. ISSN 0004-6337. 328 . doi: 10.1002/asna.200610738
Wedemeyer-Böhm, Sven; Ludwig, HG; Steffen, M.; Leenaarts, J. & Freytag, B. (2007). Inter-network regions of the Sun at millimetre wavelengths. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 471, s 977- 991 . doi: 10.1051/0004-6361:20077588
Wedemeyer-Böhm, Sven & Steffen, M. (2007). Carbon monoxide in the solar atmosphere II. Radiative cooling by CO lines. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 462, s L31- L35 . doi: 10.1051/0004-6361:20066173
Wedemeyer-Böhm, Sven; Steiner, O.; Bruls, J. & Rammacher, W. (2007). What is Heating the Quiet-Sun Chromosphere?, In Petr Heinzel; Ivan Dorotovic & Robert Rutten (ed.), The Physics of Chromospheric Plasmas. Astronomical Society of the Pacific. ISBN 978-1-583812-36-5. 368. s 93 - 102
Leenaarts, Jorrit & Wedemeyer-Boehm, S. (2006). Time-dependent hydrogen ionisation in 3D simulations of the solar chromosphere - Methods and first results. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 460, s 301- 307

Se alle arbeider i Cristin

Guevara Gomez, Juan Camilo & Wedemeyer, Sven (2021). Dynamics of small-scale dark features observed by the Atacama Large Millimeter/submillimeter Array (ALMA).
Eklund, Henrik; Szydlarski, Mikolaj Marcin & Wedemeyer, Sven (2020). Image reconstruction of interferometric ALMA data.
Wedemeyer, Sven (2020). Development of tools for solar research with ALMA at RoCS.
Wedemeyer, Sven (2020). Magnetic Tornadoes on the Sun.
Wedemeyer, Sven (2020). Observing the Sun with ALMA – Challenges, scientific potential, and first results.
Eklund, Henrik; Szydlarski, Mikolaj Marcin & Wedemeyer, Sven (2019). Shock wave propagation with high cadence solar ALMA time series.
Gaudi, Scott; Blackwood, Gary; Howard, Andrew; Latham, David; Fischer, Debra & Wedemeyer, Sven (2019). Extreme Precision Radial Velocity (EPRV) Working Group.
Guevara Gomez, Juan Camilo; Wedemeyer, Sven; Jafarzadeh, Shahin & Szydlarski, Mikolaj Marcin (2019). Dynamics of solar isolated features observed by the Atacama Large Millimeter/submillimeter Array (ALMA).
Guevara Gomez, Juan Camilo; Wedemeyer, Sven; Jafarzadeh, Shahin & Szydlarski, Mikolaj Marcin (2019). Structure and dynamics of isolated features in the solar chromosphere observed with ALMA.
Jafarzadeh, Shahin; van der Voort, Luc H.M. Rouppe; Wedemeyer, Sven & Noda, Carlos Quintero (2019). Magnetic-field topology of fibrillar structures throughout the solar chromosphere.
Jafarzadeh, Shahin & Wedemeyer, Sven (2019). Observing Waves in the Lower Solar Atmosphere with ALMA.
Jafarzadeh, Shahin; Wedemeyer, Sven; Noda, Carlos Quintero; Wiegelmann, Thomas & Rouppe van der Voort, Luc (2019). Magnetic-field topology throughout the solar chromosphere.
Jafarzadeh, Shahin; Wedemeyer, Sven & Szydlarski, Mikolaj Marcin (2019). Temperature Fluctuations in the Solar Chromosphere with ALMA.
Jafarzadeh, Shahin; Wedemeyer, Sven; Szydlarski, Mikolaj Marcin & Fleck, Bernhard (2019). Wave heating of the lower solar atmosphere.
Jafarzadeh, Shahin; Wedemeyer, Sven; Szydlarski, Mikolaj Marcin; Fleck, Bernhard & Stangalini, Marco (2019). Wave heating of the solar chromosphere from observations with ALMA.
Wedemeyer, Sven (2019). High-cadence imaging of the Sun. Vis sammendrag
A challenge of observing the Sun with ALMA is that the primary beam covers only a small region on the Sun and is therefore filled with a complex radiation pattern, which evolves on extremely short time scales of only seconds and below. Fully exploiting ALMA's possibilities therefore requires imaging at very high cadence. Accordingly, there is much potential for improving the solar observing modes and post-processing of data. The development study "High-cadence imaging of the Sun", which started in 2018, aims at developing a high-cadence imaging capability by employing realistic test cases based on state-of-the-art numerical simulations, the Solar ALMA Simulator tool, and a solar simulation pipeline. Comparisons between the input and output of the simulation pipeline will reveal how well imaging at high cadence performs and how to optimize it. We present an overview of the study and its current state.
Wedemeyer, Sven (2019). High-tech and llamas.
Wedemeyer, Sven (2019). Magnetic Field Measurements with the Atacama Millimeter/submillimeter Array.
Wedemeyer, Sven (2019). Our Dynamic Sun.
Wedemeyer, Sven (2019). Solar Astronomy with ALMA. Vis sammendrag
Solar observing with ALMA is offered as a non-standard mode since Cycle 4. The requirements for such observations are different from many other observations with ALMA in the sense that the mapped atmospheric layers of the Sun evolve on very short timescales and the primary beam being filled with complex emission. High-cadence (snapshot) imaging is needed for such a dynamic target but is very challenging. The effort and time that went into developing the observing mode seems well justified given that ALMA provides a new complementary view at a part of the solar atmosphere that is still elusive in many aspects. The solar observing campaigns with ALMA are co-ordinated with a number of space-borne and ground-based telescopes covering the UV to IR range. Co-ordinating such strictly simultaneous multi-telescope observations adds another layer of complexity but results in rich data sets covering all layers of the solar atmosphere while probing different properties of the atmospheric gas. Since Cycle 4, the imaging procedures for solar ALMA observations have been significantly improved and science-ready data are being produced. I will give a brief overview over ALMA's diagnostic potential for the Sun and challenges with carrying out solar observations and post-processing the data. First examples for Band 3 and Band 6 data are presented and illustrate the dynamic nature of the solar atmosphere, featuring, among other things, the imprint of magnetic fields and propagating shock waves.
Wedemeyer, Sven (2019). Solar science with ALMA in Norway.
Eklund, Henrik; Szydlarski, Mikolaj Marcin & Wedemeyer, Sven (2018). Interferometric ALMA observations and data processing.
Wedemeyer, Sven (2018). Experiences from applying for an ERC Consolidator Grant.
Wedemeyer, Sven (2018). Oppvarming av solens atmosfære & solfysikkforskning i dag.
Wedemeyer, Sven (2018). Sola, din nærmeste stjerne.
Wedemeyer, Sven (2018). Solar Observations with ALMA.
Wedemeyer, Sven (2015). Rød sol og evig daggry: Leting etter liv på fjerne kloder, I: Jostein Riiser Kristiansen; Anna Kathinka Dalland Evans; Henrik Svensen; Bjørn Hallvard Samset & Hanne Sigrun Byhring (red.), Stjerneklart – siste nytt fra verdensrommet. Spartacus. ISBN 9788243009738. Kapittel 15. s 96 - 108
Ayres, T. R.; Lyons, J. R.; Ludwig, Hans-Günter; Caffau, E. & Wedemeyer-Böhm, Sven (2013). Isotopic CO in the Solar Photosphere, Viewed Through the Lens of 3D Spectrum Synthesis.
Wedemeyer-Böhm, Sven & van der Voort, Luc Rouppe (2010). The solar continuum intensity distribution. Proceedings of the International Astronomical Union. ISSN 1743-9213. 15, s 333- 334
Kjeldseth-Moe, Olav & Wedemeyer-Böhm, Sven (2009). Are there variations in Earth’s global mean temperature related to the solar activity?.
Rezaei, Rezza; Steiner, Oskar; Wedemeyer-Böhm, Sven; Schlichenmaier, Rolf & Lites, Bruce W. (2007). Variation of the Stokes-V area asymmetry across magnetic elements. Astronomical Notes - Astronomische Nachrichten. ISSN 0004-6337. 328(7), s 706
Wedemeyer-Böhm, Sven (2007). Small-scale structure and dynamics of the lower solar atmosphere.