Conjugate observations of quasiperiodic emissions by the Cluster, Van Allen Probes, and THEMIS spacecraft

TitleConjugate observations of quasiperiodic emissions by the Cluster, Van Allen Probes, and THEMIS spacecraft
Publication TypeJournal Article
Year of Publication2016
Authorsěmec, F, Hospodarsky, G, Pickett, JS, ík, O, Kurth, WS, Kletzing, C
JournalJournal of Geophysical Research: Space Physics
Volume121
Issue8
Pagination7647 - 7663
Date Published08/2016
KeywordsQP emissions; quasiperiodic emissions; Van Allen Probes
AbstractWe present results of a detailed analysis of two electromagnetic wave events observed in the inner magnetosphere at frequencies of a few kilohertz, which exhibit a quasiperiodic (QP) time modulation of the wave intensity. The events were observed by the Cluster and Van Allen Probes spacecraft and in one event also by the THEMIS E spacecraft. The spacecraft were significantly separated in magnetic local time, demonstrating a huge azimuthal extent of the events. Geomagnetic conditions at the times of the observations were very quiet, and the events occurred inside the plasmasphere. The modulation period observed by the Van Allen Probes and THEMIS E spacecraft (duskside) was in both events about twice larger than the modulation period observed by the Cluster spacecraft (dawnside). Moreover, individual QP elements occur about 15 s earlier on THEMIS E than on Van Allen Probes, which might be related to a finite propagation speed of a modulating ULF wave.
URLhttp://doi.wiley.com/10.1002/2016JA022774
DOI10.1002/2016JA022774
Short TitleJ. Geophys. Res. Space Physics


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