Multi-Point Observations of Modulated Electron Precipitation
Abstract
While energetic electron precipitation modulated on the ultralow frequency (ULF) timescale has been shown in several previous observations, it remains unclear whether ULF waves are fully responsible for the electron precipitation or act as a complementary role in driving electron precipitation. In this work, we present simultaneous multi-point observations of waves observed by both Van Allen Probes, associated with conjugated energetic electron precipitation by BARREL and POES at around L ~ 6 from noon to dusk. We show that the correlation coefficient between whistler-mode wave and electron precipitation is high in several regions, including plasmaspheric plumes and plasma trough. In the plumes, an almost one-to-one correlation is observed between whistler-mode wave and energetic electron precipitation. ULF waves show a similar period to whistler-mode wave modulation albeit without one-to-one correlation. Some whistler-mode wave intensification is associated with plasma density enhancement. We will further quantify electron precipitation using theory and modeling based on the observed wave and plasma parameters to evaluate the accurate role of ULF waves and whistler-mode waves in energetic electron precipitation.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2020
- Bibcode:
- 2020AGUFMSM023..05Q
- Keywords:
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- 2455 Particle precipitation;
- IONOSPHERE;
- 2716 Energetic particles: precipitating;
- MAGNETOSPHERIC PHYSICS;
- 7867 Wave/particle interactions;
- SPACE PLASMA PHYSICS;
- 7999 General or miscellaneous;
- SPACE WEATHER