Sven Wedemeyer

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Phone +47 22856520
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Visiting address Sem Sælands vei 13 Svein Rosselands hus 0371 OSLO
Postal address Postboks 1029 0315 Oslo

Primary research fields Main positions and functions Current major research activities
Previous research activities Publications Information on other platforms

Information on other platforms

ORCID (Open Researcher and Contributor ID) 0000-0002-5006-7540
ADS (NASA's Astrophysics Data System) Publications
Cristin (Current Research Information System in Norway) Profile, projects, and publications
ResearchGate Profile page 
LinkedIn Profile page

Primary research fields

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


Current main positions and functions


Current major research activities

Solar/Stellar Science at (sub-)millimeter and radio wavelengths

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)
  • COST Action "The birth of solar systems" (PLANETS, CA22133), WG4 "Emerging habitable environments" (since 2023)

Previous research (in part ongoing)

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. 

  • PI of the EMISSA project (funded by the Research Council of Norway, 2019-2023)
  • 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).
  • Norwegian representative at the Observing Programme Committee (OPC) of the Nordic Optical Telescope (NOT, until 2023) 
  • PI of the ESO-funded ALMA Development Study  High-Cadence Imaging of the Sun (2018-2023)
  • The ERC-funded SolarALMA project ran from 2016 to 2021 and aimed at utilizing ALMA for detailed studies of the solar chromosphere with particular focus on the coronal heating problem.
  • Initiator and co-ordinator of the SSALMON research network with more than 80 researchers (since 2014)  
  • "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.

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

Publications

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  • Pandit, Sneha; Wedemeyer, Sven & Carlsson, Mats (2023). Comparison of activity indicators in a 3D model atmosphere.
  • Wedemeyer, Sven & Szydlarski, Mikolaj (2023). Artificial observations of the Sun – The scientific potential of optimizing future solar observatories.
  • Wedemeyer, Sven (2023). Radio and millimeter observations of the Sun - Recent advances and future opportunities .
  • Wedemeyer, Sven & Kirkaune, Mats (2023). Observing the Sun with AtLAST - Prospects and Challenges.
  • Pandit, Sneha; Wedemeyer, Sven & Carlsson, Mats (2023). Comparison of activity indicators in a 3D model atmosphere .
  • Wedemeyer, Sven; Sand, Mats Ola; Øyre, Eilif Sommer & D`Angelo, Martina (2022). På jakt etter eksoplaneter .
  • Guevara Gomez, Juan Camilo; Jafarzadeh, Shahin & Wedemeyer, Sven (2022). Characterisation of bright chromospheric and oscillating small-scale features observed with ALMA.
  • Mohan, Atul; Wedemeyer, Sven; Oberoi, Divya; Hauschildt, Peter, H.; McCauley, Patrick & Mondal, Surajit [Show all 9 contributors for this article] (2022). New insights on solar/stellar activity using the tomographic potential of mm & radio spectroscopic imaging.
  • Pandit, Sneha; Wedemeyer, Sven & Mohan, Atul (2022). Formation of Activity Indicators in a 3D model atmosphere.
  • Mohan, Atul; Wedemeyer, Sven; Hauschildt, Peter, H.; Pandit, Sneha & Saberi, Maryam (2022). Stellar atmospheric tomography with mm - cm spectroscopic imaging.
  • Mohan, Atul; Wedemeyer, Sven; Pandit, Sneha; Saberi, Maryam & Hauschildt, Peter, H. (2022). A potential robust millimeter activity index & its links to atmospheric structure and physical parameters.
  • Mohan, Atul; Oberoi, Divya; Wedemeyer, Sven; Mondal, Surajit; McCauley, Patrick & Mastrano, Alpha [Show all 9 contributors for this article] (2022). Tomographic exploration of solar/stellar activity with modern radio & mm arrays.
  • Pandit, Sneha; Wedemeyer, Sven & Mohan, Atul (2022). The Formation of Activity Indicators in 3D Model Atmosphere.
  • Pandit, Sneha; Wedemeyer, Sven & Mohan, Atul (2022). Formation of Activity Indicators in a 3D model Atmosphere.
  • Pandit, Sneha; Wedemeyer, Sven & Carlsson, Mats (2022). Formation of Activity Indicators in a 3D Model Atmosphere.
  • Saberi, Maryam; Khouri, T.; Velilla-Prieto, L.; Fonfria, J. P.; Vlemmings, W. & Wedemeyer, Sven (2022). Tracing the role of AGB stars in the Galactic Fluorine budget .
  • Guevara Gomez, Juan Camilo; Jafarzadeh, Shahin & Wedemeyer, Sven (2021). Oscillations in chromospheric small-scale bright features observed with ALMA.
  • Saberi, Maryam; Khouri, Theo; Velilla-Prieto, L.; Fonfria, . P.; Vlemmings, W. & Wedemeyer, Sven (2021). Tracing the role of AGB stars in the Galactic Fluorine budget .
  • Wedemeyer, Sven; Szydlarski, Mikolaj; Jafarzadeh, Shahin; Henriques, Vasco; Guevara Gomez, Juan Camilo & Eklund, Henrik [Show all 10 contributors for this article] (2021). Lessons learned from 5 years of solar observing with ALMA.
  • Wedemeyer, Sven; Szydlarski, Mikolaj; Jafarzadeh, Shahin; Henriques, Vasco; Eklund, Henrik & Guevara Gomez, Juan Camilo [Show all 11 contributors for this article] (2021). A brief introduction to solar observing with ALMA .
  • Wedemeyer, Sven; Szydlarski, Mikolaj; Jafarzadeh, Shahin; Henriques, Vasco; Eklund, Henrik & Guevara Gomez, Juan Camilo [Show all 10 contributors for this article] (2021). Five years observing the solar chromosphere with ALMA - First results and future opportunities.
  • Guevara Gomez, Juan Camilo; Jafarzadeh, Shahin & Wedemeyer, Sven (2021). Oscillations in small-scale bright features observed with ALMA.
  • Guevara Gomez, Juan Camilo & Wedemeyer, Sven (2021). Dynamics of small-scale dark features observed by the Atacama Large Millimeter/Submillimeter Array (ALMA).
  • Saberi, Maryam; Jafarzadeh, Shahin; Gafeira, Ricardo; Wedemeyer, Sven & Szydlarski, Mikolaj (2021). MHD waves in chromospheric fibrillar structures as observed with ALMA.
  • Wedemeyer, Sven (2021). Sola over Atacama-ørkenen. Astronomi. ISSN 0802-7587. 2, p. 36–39.
  • Jafarzadeh, Shahin; Gafeira, Ricardo; Wedemeyer, Sven & Szydlarski, Mikolaj (2021). MHD waves in chromospheric fibrillar structures as observed with ALMA.
  • Pandit, Sneha & Wedemeyer, Sven (2021). The sun as a star: new insights from the full disk observations with ALMA.
  • Wedemeyer, Sven; Szydlarski, Mikolaj; Jafarzadeh, Shahin; de Jorge Henriques, Vasco Manuel; Eklund, Henrik & Guevara Gomez, Juan Camilo [Show all 10 contributors for this article] (2021). Observing the Sun with ALMA - First results and future opportunities.
  • Wedemeyer, Sven; Szydlarski, Mikolaj; Jafarzadeh, Shahin; de Jorge Henriques, Vasco Manuel; Eklund, Henrik & Guevara Gomez, Juan Camilo [Show all 10 contributors for this article] (2021). Five years observing the solar chromosphere with ALMA - First results and future opportunities.
  • 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.
  • 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). Observing the Sun with ALMA – Challenges, scientific potential, and first results.
  • Wedemeyer, Sven (2020). Magnetic Tornadoes on the Sun.
  • Wedemeyer, Sven (2019). Magnetic Field Measurements with the Atacama Millimeter/submillimeter Array.
  • Wedemeyer, Sven (2019). Solar science with ALMA in Norway.
  • Wedemeyer, Sven (2019). High-tech and llamas.
  • Wedemeyer, Sven (2019). High-cadence imaging of the Sun .
  • Wedemeyer, Sven (2019). Solar Astronomy 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; Fleck, Bernhard & Stangalini, Marco (2019). Wave heating of the solar chromosphere from observations with ALMA.
  • Jafarzadeh, Shahin; Wedemeyer, Sven; Szydlarski, Mikolaj Marcin & Fleck, Bernhard (2019). Wave heating of the lower solar atmosphere.
  • 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 & Szydlarski, Mikolaj Marcin (2019). Temperature Fluctuations in the Solar Chromosphere with ALMA.
  • Jafarzadeh, Shahin & Wedemeyer, Sven (2019). Observing Waves in the Lower Solar Atmosphere with ALMA.
  • Eklund, Henrik; Szydlarski, Mikolaj Marcin & Wedemeyer, Sven (2019). Shock wave propagation with high cadence solar ALMA time series.
  • 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.
  • Wedemeyer, Sven (2019). Our Dynamic Sun.
  • 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. In Kristiansen, Jostein Riiser; Evans, Anna Kathinka Dalland; Svensen, Henrik; Samset, Bjørn Hallvard & Byhring, Hanne Sigrun (Ed.), Stjerneklart – siste nytt fra verdensrommet. Spartacus. ISSN 9788243009738. p. 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, p. 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).
  • Wedemeyer-Böhm, Sven (2007). Small-scale structure and dynamics of the lower solar atmosphere.
  • Pandit, Sneha & Wedemeyer, Sven (2023). A new look at Solar-Stellar Activity with the Atacama Large Millmeter/submillimeter Array. Faculty of Mathematics and Natural Sciences. ISSN 1501-7710.
  • Guevara Gomez, Juan Camilo; Wedemeyer, Sven & Rouppe van der Voort, Luc (2022). Observations of the dynamics and structure of the solar atmosphere with ALMA . Universitetet i Oslo. ISSN 1501-7710.
  • Eklund, Henrik & Wedemeyer, Sven (2021). Investigating dynamic small-scale events in the Sun with the Atacama Large Millimeter/sub-millimeter Array. Faculty of Mathematics and Natural Sciences. ISSN 1501-7710.
  • Gaudi, Scott; Blackwood, Gary; Howard, Andrew; Latham, David; Fischer, Debra & Wedemeyer, Sven (2019). Extreme Precision Radial Velocity (EPRV) Working Group. Bulletin of the American Astronomical Society.

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Published Apr. 23, 2024 2:40 PM - Last modified Apr. 29, 2024 1:08 PM