Van Allen Probes Bibliography is from August 2012 through September 2021


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Global observations of magnetospheric high- m poloidal waves during the 22 June 2015 magnetic storm

AuthorLe, G.; Chi, P.; Strangeway, R.; Russell, C.; Slavin, J.; Takahashi, K.; Singer, H.; Anderson, B.; Bromund, K.; Fischer, D.; Kepko, E.; Magnes, W.; Nakamura, R.; Plaschke, F.; Torbert, R.;
Keywordsfield line resonances; high-m poloidal waves; magnetic storm; magnetospheric multiscale mission; ULF waves; Van Allen Probes
AbstractWe report global observations of high-m poloidal waves during the recovery phase of the 22 June 2015 magnetic storm from a constellation of widely spaced satellites of five missions including Magnetospheric Multiscale (MMS), Van Allen Probes, Time History of Events and Macroscale Interactions during Substorm (THEMIS), Cluster, and Geostationary Operational Environmental Satellites (GOES). The combined observations demonstrate the global spatial extent of storm time poloidal waves. MMS observations confirm high azimuthal wave numbers (m ~ 100). Mode identification indicates the waves are associated with the second harmonic of field line resonances. The wave frequencies exhibit a decreasing trend as L increases, distinguishing them from the single-frequency global poloidal modes normally observed during quiet times. Detailed examination of the instantaneous frequency reveals discrete spatial structures with step-like frequency changes along L. Each discrete L shell has a steady wave frequency and spans about 1 RE, suggesting that there exist a discrete number of drift-bounce resonance regions across L shells during storm times.
Year of Publication2017
JournalGeophysical Research Letters
Number of Pages
Date Published04/2017