Themis Observations of Long-lived Regions of Large-Amplitude Whistler Waves in the Inner Magnetosphere

Details Themis Observations of Long-lived Regions of Large-Amplitude Whistler Waves in the Inner Magnetosphere Themis Observations of Long-lived Regions of Large-Amplitude Whistler Waves in the Inner Magnetosphere

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm42a..05c&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM42A-05

Mathematics

Probability

2712 Electric Fields (2411), 2730 Magnetosphere: Inner, 2772 Plasma Waves And Instabilities (2471), 2774 Radiation Belts, 7845 Particle Acceleration

Scientific paper

The Themis mission, with multiple satellites in near-equatorial orbits, offers an excellent opportunity to observe the large-amplitude whistler waves (>100 mV/m) that can exist in the radiation belts. We use data from the Electric Field Instrument (EFI) to assess several statistical properties of these waves, including the occurrence frequency, spatial extent and longevity of regions of large-amplitude whistlers. We show that the probability distribution of wave activity in the dawn-side radiation belts, especially near L-shells from 3.5 to 5.5, has a significant high-amplitude tail and is hence not well-described by long-term time averages. Regions of enhanced wave activity exhibit four-second averaged wave power above 1 mV/m and sub-second bursts up to several hundred mV/m. These regions are spatially localized to at most several hours of local time azimuthally, but can persist in the same location for several days. These observations of persistent, bursty, large-amplitude waves support the importance of the emerging nonlinear theories of electron acceleration in the radiation belts.

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