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Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Geophys+Res+Lett 2017 ; 44 (8): 3456-64 Nephropedia Template TP
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Global observations of magnetospheric high?m poloidal waves during the 22 June 2015 magnetic storm #MMPMID28713180
Le G; Chi PJ; Strangeway RJ; Russell CT; Slavin JA; Takahashi K; Singer HJ; Anderson BJ; Bromund K; Fischer D; Kepko EL; Magnes W; Nakamura R; Plaschke F; Torbert RB
Geophys Res Lett 2017[Apr]; 44 (8): 3456-64 PMID28713180show ga
We 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.