Outer Radiation Belt Response to Ring Current development
Abstract
Coupled dynamics of the ring current and the outer radiation belt particle populations during geomagnetic disturbances that occurred in 2014 and 2015 has been considered. The selected events were accompanied by different conditions in space like strong interplanetary magnetic field changes and extreme solar wind pressure pulses. Such interplanetary conditions produce dramatic responses in global magnetospheric dynamics, as well as in variations of both magnetospheric current systems and charged particle fluxes. Multi-point observations from Van Allen Probes, GOES, Electro-L, POES, and Meteor-M satellites allow to analyze and interpret coordinated changes in trapped particle populations. One can see that ring current response on solar wind variations depends on particle energy. For example, fast solar wind pressure pulse can provide non-adiabatical changes in the population of ring current particles with drift period longer than characteristic time of magnetospheric compression. Complicated dynamics of the ring current change magnetic field in the inner magnetosphere and provide conditions for a fast decrease or recovery of energetic electron fluxes. VAP' particle flux measurements demonstrate outer radiation belt adiabatic changes in response to ring current storm-time development. Simultaneous measurements of ring current proton fluxes and energetic electron fluxes demonstrate the coupled dynamics of these trapped particle populations and predominance of adiabatic mechanisms for the development of the outer Earth's radiation belt during the considered events. This research was supported by RScF grant No 16-17-00098
- Publication:
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43rd COSPAR Scientific Assembly. Held 28 January - 4 February
- Pub Date:
- January 2021
- Bibcode:
- 2021cosp...43E1149K