Recent developments in the radiation belt environment model |
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| Authors: | M-C Fok A Glocer Q Zheng RB Horne NP Meredith JM Albert T Nagai |
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| Institution: | 1. Geospace Physics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA;2. Department of Astronomy, University of Maryland, College Park, MD, USA;3. Physical Science Division, British Antarctic Survey, Cambridge, UK;4. Air Force Research Laboratory, Hanscom, MA, USA;5. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Tokyo, Japan;1. Embry-Riddle Aeronautical University, 600 S. Clyde Morris Blvd., Daytona Beach, FL 32114, United States;2. Geophysical Institute, University of Alaska Fairbanks, 903 Koyukuk Drive, Fairbanks, AK 99775, United States;1. Space Research Institute, Moscow, Russia;2. Polar Geophysical Institute, Apatity, Russia;3. Sodankylä Geophysical Observatory of the Oulu University, Finland;4. Institute of the Earth Physics, Moscow, Russia;5. Finnish Meteorological Institute, Helsinki, Finland;1. Space Research Institute of the Russian Academy of Sciences (IKI), Moscow, Russia;2. Moscow Institute of Physics and Technology (State University), Moscow, Russia;1. Science and Technology on Aerospace Flight Dynamics Laboratory, Beijing Aerospace Control Center, Beijing, China;2. Institute of Applied Mathematics, Morningside Center of Mathematics and LESC, Institute of Computational Mathematics, Academy of Mathematics and System Science, Chinese Academy of Sciences, Beijing, China;3. Department of Aerospace Guidance Navigation and Control, School of Astronautics, Beihang University, Beijing, China;4. Beijing Institute of Aerospace Control Devices, Beijing, China;5. National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China;6. University of Chinese Academy of Sciences, Beijing, China;1. Swedish Institute of Space Physics, Box 812, Kiruna 98128, Sweden;2. Physics Institute, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland;3. Max Planck Institute for Solar System Research, Justus-von-Liebig-Weg 3, 37077 Göttingen, Germany;4. The Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Rd., Laurel, MD, USA |
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| Abstract: | The fluxes of energetic particles in the radiation belts are found to be strongly controlled by the solar wind conditions. In order to understand and predict the radiation particle intensities, we have developed a physics-based Radiation Belt Environment (RBE) model that considers the influences from the solar wind, ring current and plasmasphere. Recently, an improved calculation of wave-particle interactions has been incorporated. In particular, the model now includes cross diffusion in energy and pitch-angle. We find that the exclusion of cross diffusion could cause significant overestimation of electron flux enhancement during storm recovery. The RBE model is also connected to MHD fields so that the response of the radiation belts to fast variations in the global magnetosphere can be studied. We are able to reproduce the rapid flux increase during a substorm dipolarization on 4 September 2008. The timing is much shorter than the time scale of wave associated acceleration. |
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