Sven Wedemeyer

Associate Professor - Rosseland Centre for Solar Physics
Image of Sven Wedemeyer
Norwegian version of this page
Phone +47 22856520
Room 203
Visiting address Sem Sælands vei 13 Svein Rosselands hus 0371 OSLO
Postal address Postboks 1029 0315 OSLO

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

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 

Stellar physics 

  • ChETEC-INFRA (Chemical Elements as Tracers of the Evolution of the Cosmos - Infrastructures for Nuclear Astrophysics), JRA3-WP5 „Astronuclear Abundances 2040“, associate partner.

Extrasolar planets and their host stars

  • 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)
  • ARIEL (Atmospheric Remote-sensing Infrared Exoplanet Large-survey, ESA exoplanet detection mission), Consortium Supporting Member (since 2021)

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)

Tags: Astronomy and Astrophysics, Solar Physics, Observations, Simulations, Computational Astrophysics, Solar Chromosphere, Stars, Extrasolar Planets, Atacama Large Millimeter/submillimeter Array (ALMA), Nordic Optical Telescope


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  • 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.
  • White, Stephen; Barta, Miroslav; Bastian, Timothy; Shimojo, Masumi & Wedemeyer, Sven (2020). Correlator Desiderata for Solar Radiophysics at ALMA.
  • 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. Show summary
  • 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. Show summary
  • 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

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Published Nov. 3, 2010 3:21 PM - Last modified May 12, 2021 4:56 PM