Statistical Occurrence and Distribution of High-Amplitude Whistler Mode Waves in the Outer Radiation Belt

E. Tyler, A. Breneman, C. Cattell, J. Wygant, S. Thaller, D. Malaspina

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

We present the first statistical analysis with continuous data coverage and nonaveraged 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 magnetic local time 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 predawn sector. These results have important implications for modeling radiation belt particle interactions with chorus, as large-amplitude waves interact nonlinearly with electrons. Results also may provide clues regarding the mechanisms which result in growth to large amplitudes.

Original languageEnglish (US)
Pages (from-to)2328-2336
Number of pages9
JournalGeophysical Research Letters
Volume46
Issue number5
DOIs
StatePublished - Mar 16 2019

Bibliographical note

Funding Information:
This study was supported by NASA contract NNN06AA01C at the University of Minnesota. Van Allen Probes EFW data may be accessed at http://www.space.umn.edu/rbspefw-data website. Van Allen Probes EMFISIS data may be accessed at https://emfisis.physics.uiowa.edu website. The Auroral Electrojet Index may be accessed at http://wdc.kugi. kyoto-u.ac.jp/aedir/index.html website.

Publisher Copyright:
©2019. American Geophysical Union. All Rights Reserved.

Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.

Keywords

  • Van Allen belt
  • chorus
  • radiation belt
  • whistler waves

Fingerprint Dive into the research topics of 'Statistical Occurrence and Distribution of High-Amplitude Whistler Mode Waves in the Outer Radiation Belt'. Together they form a unique fingerprint.

Cite this