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Short Chorus Wave Packets: Generation Within Chorus Elements, Statistics, and Consequences on Energetic Electron
D Mourenas1,2, X-J Zhang3, D Nunn4
1CEA DAM DIF Arpajon France.
Journal of Geophysical Research. Space Physics
|July 22, 2022
Summary
Short chorus wave packets in Earth's radiation belt are generated by rising tones. These packets, unlike longer ones, enhance electron diffusion toward the loss cone, impacting space weather.
Area of Science:
- Space Physics
- Plasma Physics
- Computational Physics
Background:
- Chorus waves are common in Earth's outer radiation belt.
- Understanding chorus wave generation and effects is crucial for radiation belt dynamics.
Purpose of the Study:
- Investigate the generation of short chorus wave packets within long rising tones.
- Analyze the impact of short versus long chorus packets on electron precipitation.
Main Methods:
- Vlasov hybrid simulations with one or two triggering waves.
- Analysis of Van Allen Probes and ELFIN CubeSat data.
- Test particle simulations.
Main Results:
- Short chorus packets are generated consistently with resonance non-overlap criteria.
- Short packets enhance diffusive transport of 50-200 keV electrons.
- Long packets cause anomalous trapping, reducing precipitation below 150 keV.
Conclusions:
- Short chorus wave packets play a significant role in electron dynamics and loss.
- Wave packet duration and amplitude critically influence electron transport and precipitation in the radiation belt.
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