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Statistical occurrence and distribution of high amplitude whistler-mode waves in the outer radiation belt


AuthorTyler, E.; Breneman, A.; Cattell, C.; Wygant, J.; Thaller, S.; Malaspina, D.;
KeywordsChorus; Radiation belt; Van Allen belt; Van Allen Probes; Whistler waves
AbstractWe present the first statistical analysis with continuous data coverage and non-averaged amplitudes of the prevalence and distribution of high-amplitude (> 5 mV/m) whistler-mode waves in the outer radiation belt using 5 years of Van Allen Probes data. These waves are most common above L=3.5 and between MLT of 0-7 where they are present 1-4\% of the time. During high geomagnetic activity, high-amplitude whistler-mode wave occurrence rises above 30\% in some regions. During these active times the plasmasphere erodes to lower L and high-amplitude waves are observed at all L outside of it, with the highest occurrence at low L (3.5-4) in the pre-dawn sector. These results have important implications for modeling radiation belt particle interactions with chorus, as large-amplitude waves interact non-linearly with electrons. Results also may provide clues regarding the mechanisms which result in growth to large amplitudes.
Year of Publication2019
JournalGeophysical Research Letters
Volume
Number of Pages
Section
Date Published02/2019
ISBN
URLhttps://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019GL082292
DOI10.1029/2019GL082292