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Quantifying the Size and Duration of a Microburst-Producing Chorus Region on 5 December 2017
S S Elliott1, A W Breneman2, C Colpitts1
1The University of Minnesota Minneapolis MN USA.
Geophysical Research Letters
|October 17, 2022
Summary
Microbursts, caused by chorus waves, are significant electron loss events in Earth's outer radiation belt. This study quantifies the source region size, revealing microbursts as a major contributor to electron loss.
Area of Science:
- Space physics
- Plasma physics
- Atmospheric science
Background:
- Microbursts are rapid electron injections into the atmosphere, linked to chorus waves.
- Quantifying microbursts' impact on outer radiation belt electron loss is challenging due to uncertainties in source region size.
Purpose of the Study:
- To determine the spatial extent of the chorus wave source region responsible for microburst precipitation.
- To assess the contribution of microbursts to outer radiation belt electron loss.
Main Methods:
- Combined data from Van Allen Probes (RBSP), Arase, and ground-based VLF stations for chorus waves.
- Utilized FIREBIRD II, AC6 CubeSats, and POES for microburst precipitation data (>30 keV).
- Analyzed a specific event beginning December 5, 2017.
Main Results:
- Estimated the microburst-producing chorus source region to be approximately 4-8 magnetic local time (MLT) and 2-5 Earth radii (L-shell).
- The source region persisted for about 30 hours.
Conclusions:
- Microburst precipitation, driven by chorus waves, is a significant mechanism for outer radiation belt electron loss.
- Accurate characterization of the source region is crucial for understanding radiation belt dynamics.
Keywords:
chorus waveselectron precipitationmicroburst precipitationradiation beltwave‐particle interactionsMore Related Videos
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