Affiliation:
1. University of California, Los Angeles Los Angeles CA USA
2. Applied Physics Laboratory Johns Hopkins University Laurel MD USA
3. Department of Physics The University of Texas at Dallas Richardson TX USA
4. Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA
Abstract
AbstractSub‐auroral polarization streams (SAPS) are one of the most intense manifestations of magnetosphere‐ionosphere coupling. Magnetospheric energy transport to the ionosphere within SAPS is associated with Poynting flux and the precipitation of thermal energy (0.03–30 keV) plasma sheet particles. However, much less is known about the precipitation of high‐energy (≥50 keV) ions and electrons and their contribution to the low‐altitude SAPS physics. This study examines precipitation within one SAPS event using a combination of equatorial THEMIS and low‐altitude DMSP and ELFIN observations, which, jointly, cover from a few eV up to a few MeV energy range. Observed SAPS are embedding the ion isotropy boundary, which includes strong 300–1,000 keV ion precipitation. SAPS are associated with intense precipitation of relativistic electrons (≤3 MeV), well equatorward of the electron isotropy boundary. Such relativistic electron precipitation is likely due to electron scattering by electromagnetic ion cyclotron waves at the equator.
Funder
National Aeronautics and Space Administration
Budget Division
Publisher
American Geophysical Union (AGU)
Cited by
1 articles.
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