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

Le, G.; Chi, P. J.; Strangeway, R. J.; Russell, C. T.; Slavin, J. A.; Takahashi, K.; Singer, H. J.; Anderson, B. J.; Bromund, K.; Fischer, D.; Kepko, E. L.; Magnes, W.; Nakamura, R.; Plaschke, F.; Torbert, R. B.

doi:10.1002/2017GL073048

i

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

2017
By Le, G. ; Chi, P. J. ; Strangeway, R. J. ; ...

Details

Journal Title:

Geophysical Research Letters
Personal Author:

Le, G. ; Chi, P. J. ; Strangeway, R. J. ; Russell, C. T. ; Slavin, J. A. ; Takahashi, K. ; Singer, H. J. ; Anderson, B. J. ; Bromund, K. ; Fischer, D. ; Kepko, E. L. ; Magnes, W. ; Nakamura, R. ; Plaschke, F. ; Torbert, R. B.
NOAA Program & Office:

NWS (National Weather Service) ; SWPC (Space Weather Prediction Center)
Description:

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.
Keywords:

Magnetic storms
Source:

Geophysical Research Letters 44(8): 3456-3464, 2017
DOI:

https://doi.org/10.1002/2017GL073048
Pubmed Central ID:

PMC28713180
Document Type:

Journal Article
Rights Information:

CC BY-NC-ND
Compliance:

PMC
Main Document Checksum:

urn:sha256:7bf98a994137edd630727e405eac2a3a34dbd5a63e171d253a1013fbd1c6335c
Download URL:

https://repository.library.noaa.gov/view/noaa/28619/noaa_28619_DS1.pdf
File Type:

[PDF - 1.88 MB ]

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