Van Allen Probe Observations of Periodic Rising Frequencies of the Fast Magnetosonic Mode

TitleVan Allen Probe Observations of Periodic Rising Frequencies of the Fast Magnetosonic Mode
Publication TypeJournal Article
Year of Publication2014
AuthorsBoardsen, SA, Hospodarsky, GB, Kletzing, CA, Pfaff, RF, Kurth, WS, Wygant, JR, MacDonald, EA
JournalGeophysical Research Letters
Volume41
Start Page8161
Issue23
Date Published12/2014
KeywordsFast Magnetosonic Waves; Inner Dayside Magnetosphere; Periodic-Dispersive Features; Van Allen Probes
AbstractNear simultaneous periodic dispersive features of fast magnetosonic mode emissions are observed by both Van Allen Probes spacecraft while separated in magnetic local time by ~5 hours: Probe A at 15 and Probe B at 9–11 hours. Both spacecraft see similar frequency features, characterized by a periodic repetition at ~180 s. Each repetition is characterized by a rising frequency. Since no modulation is observed in the proton shell distribution, the plasma density, or in the background magnetic field at either spacecraft we conclude that these waves are not generated near the spacecraft but external to both spacecraft locations. Probe A while outside the plasmapause sees the start of each repetition ~40 s before probe B while deep inside the plasmasphere. We can qualitatively reproduce the dispersive features, but not the quantitative details. The cause for this phenomena remains to be identified.
URLhttp://doi.wiley.com/10.1002/2014GL062020
DOI10.1002/2014GL062020
Short TitleGeophys. Res. Lett.


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