Action Team: Origins of the Spectral Irradiance and its Intermediate Timescale Variability

Team ID: S2-06

James Klimchuk (NASA/GSFC, USA),

Sherry Chhabra (GMU/NRL, USA),,

James Klimchuk (NASA/GSFC, USA),

Keywords (Impact):
Satellite/debris drag, Navigation and/or Communications

Keywords (Other):
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Keywords (Activity Type):
Understanding , Modeling, Forecasting , Roadmap

As a major energy input to the terrestrial upper atmosphere, the solar spectral irradiance is an important driver of space weather. Variability on timescales of one to several days affects the drag experienced by orbiting objects and the propagation of radio signals via scintillation and a changing plasma frequency altitude profile. Such variability is associated with the evolution of solar active regions and the rotation of active regions onto and off of the visible solar disk.

The goal of this action team is to provide physical models for improved forecasts of the spectral irradiance and accurate nowcasts of gaps in wavelength coverage. Understanding coronal heating is an important part of this effort that will greatly benefit other action teams. Our team will interact closely with S2-02 (solar indices) and G2A-02 and 03 (terrestrial impacts).

Action items:
1. Assess the current state of modeling of the solar spectral irradiance
2. Identify existing research models that could be used for this purpose
3. Evaluate how the models can be improved and transitioned to operations 
4. Determine how the model output depends on assumptions about coronal heating
5. Explore how new knowledge of coronal heating can be incorporated into the models

Action Topics:

  • Analysis, modeling and prediction of coronal structure and solar wind sources,
  • Understanding coronal heating and solar wind acceleration,
  • Quantifying and forecasting irradiance inputs to ionosphere/thermosphere models

Cluster with overlapping topics:

  • S2: Ambient solar magnetic field, heating and spectral irradiance,
  • H4: Solar System and beyond,
  • G2A: Atmosphere variability,
  • G2B: Ionosphere variability

Link to external website:

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Additional Affiliation
Spiro Antiochos (University of Michigan, USA)
Patrick Antolin (Northumbria University, UK)
Stephen Bradshaw (Rice University)
Michaela Brchnelova (KU Leuven, BELGIUM)
Cosima Breu (University of St. Andrews, UK)
Peter Cargill (University of St. Andrews, UK) Imperial College, London
Phillip Chamberlin (LASP (Laboratory for Atmospheric and Space Physics), USA)
Sherry Chhabra (GMU - George Mason University, USA) NRL - Naval Research Laboratory, USA
Gabriele Cozzo (Università degli Studi di Palermo, Italy)
Lars Daldorff (NASA/GSFC, USA)
Bart De Pontieu (LMSAL - Lockheed Martin Solar and Astrophysics Laboratory, USA)
Cooper Downs (Predictive Science Inc., USA)
Tamas Gombosi (University of Michigan, USA)
Gabriela Gonzalez (LASP (Laboratory for Atmospheric and Space Physics), USA)
Boris Gudiksen (University of Oslo, Norway)
Viggo Hansteen (LMSAL - Lockheed Martin Solar and Astrophysics Laboratory, USA)
Thomas Howson (University of St. Andrews, UK)
Craig Johnston (GMU - George Mason University, USA) NASA/GSFC, USA
Dylan Kee (NASA/GSFC, USA)
Irina Kitiashvili (NASA/AMES, USA)
James Klimchuk (NASA/GSFC, USA)
Kalman Knizhnik (NRL - Naval Research Laboratory, USA)
Terry Kucera (NASA/GSFC, USA)
Hidetaka Kuniyoshi (University of Tokyo, Japan)
Enrico Landi (University of Michigan, USA)
James Leake (NASA/GSFC, USA)
Jon Linker (Predictive Science Inc., USA)
Zekun Lu (Nanjing University, China)
Manuel Luna (Universitat de les Illes Balears)
Anna Malanushenko (UCAR HAO, USA)
Juan Martinez Sykora (LMSAL - Lockheed Martin Solar and Astrophysics Laboratory, USA)
Biswajit Mondal (NASA/MSFC, USA)
Ramon Oliver (Universitat de les Illes Balears)
Paolo Pagano (Università degli Studi di Palermo, Italy)
Susanna Parenti (IAS - Institut d'Astrophysique Spatiale, France)
Joeseph Plowman (Southwest Research Institute, USA)
Stefaan Poedts (KU Leuven, BELGIUM)
David Pontin (University of Newcastle, Australia)
Fabio Reale (Università degli Studi di Palermo, Italy)
Jeffrey Reep (University of Hawaii)
Jack Reid (University of St. Andrews, UK)
Mathias Rempel (UCAR HAO, USA)
Jenny Rodriguez Gomez (CUA - Catholic University of America, USA) NASA/GSFC, USA
Samuel Schonfeld (AFRL - Air Force Research Laboratory, USA)
Tong Shi (University of Michigan, USA)
Shanwlee Sow Mondal (NASA/GSFC, USA)
Judit Szente (University of Michigan, USA)
Will T. Barnes (NASA/GSFC, USA)
Paola Testa (Harvard-Smithsonian Center for Astrophysics)
John Unverferth (NRL - Naval Research Laboratory, USA) NRC
Vadim Uritsky (NASA/GSFC, USA)
Bart van der Holst (University of Michigan, USA)
Tom Van Doorsselaere (KU Leuven, BELGIUM)
Nicholeen Viall (NASA/GSFC, USA)
Angelos Vourlidas (JHU/APL, USA)
Quentin Wargnier (LMSAL - Lockheed Martin Solar and Astrophysics Laboratory, USA)
Amy Winebarger (NASA/MSFC, USA)