Relativistic electron response to the combined magnetospheric impact of a coronal mass ejection overlapping with a high-speed stream: Van Allen Probes observations
Journal Article
·
· Journal of Geophysical Research. Space Physics
- NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
- Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Physics
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of California, Los Angeles, CA (United States). Dept. of Atmospheric and Oceanic Sciences
- Aerospace Corporation, Los Angeles, CA (United States)
- NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland, College Park, MD (United States). Dept. of Astronomy. Center for Research and Exploration in Space Science & Technology (CRESST)
- NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); The Catholic Univ. of America, Washington, DC (United States). Physics Dept.
- Univ. of New Hampshire, Durham, NH (United States). Inst. for Study of Earth, Oceans, and Space
- Univ. of Iowa, Iowa City, IA (United States). Dept. of Physics and Astronomy
During early November 2013, the magnetosphere experienced concurrent driving by a coronal mass ejection (CME) during an ongoing high-speed stream (HSS) event. The relativistic electron response to these two kinds of drivers, i.e., HSS and CME, is typically different, with the former often leading to a slower buildup of electrons at larger radial distances, while the latter energizing electrons rapidly with flux enhancements occurring closer to the Earth. In this paper, we present a detailed analysis of the relativistic electron response including radial profiles of phase space density as observed by both Magnetic Electron and Ion Sensor (MagEIS) and Relativistic Electron Proton Telescope instruments on the Van Allen Probes mission. Data from the MagEIS instrument establish the behavior of lower energy (<1 MeV) electrons which span both intermediary and seed populations during electron energization. Measurements characterizing the plasma waves and magnetospheric electric and magnetic fields during this period are obtained by the Electric and Magnetic Field Instrument Suite and Integrated Science instrument on board Van Allen Probes, Search Coil Magnetometer and Flux Gate Magnetometer instruments on board Time History of Events and Macroscale Interactions during Substorms, and the low-altitude Polar-orbiting Operational Environmental Satellites. These observations suggest that during this time period, both radial transport and local in situ processes are involved in the energization of electrons. Finally, the energization attributable to radial diffusion is most clearly evident for the lower energy (<1 MeV) electrons, while the effects of in situ energization by interaction of chorus waves are prominent in the higher-energy electrons.
- Research Organization:
- Aerospace Corporation, Los Angeles, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of California, Los Angeles, CA (United States); Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- National Aeronautics and Space Administration (NASA) (United States); National Science Foundation (NSF) (United States); USDOE
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1467364
- Report Number(s):
- LA-UR--15-28237
- Journal Information:
- Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 9 Vol. 120; ISSN 2169-9380
- Publisher:
- American Geophysical UnionCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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