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

F Němec; G Hospodarsky; J. S Pickett; O Santolík; W. S Kurth; C Kletzing

doi:10.1002/2016JA022774

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

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

F Němec, G Hospodarsky, J. S Pickett, O Santolík, W. S Kurth and C Kletzing

Journal of geophysical research. Space physics, Vol.121(8), pp.7647-7663

08/2016

DOI: 10.1002/2016JA022774

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Abstract

We 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. Key Points Multispacecraft (Cluster, Van Allen Probes, and THEMIS) observations of quasiperiodic emissions Huge azimuthal extent of the events, noticeable time delay (about 15 s) between individual spacecraft Modulation period on the duskside about twice larger than on the dawnside

QP emissions

quasiperiodic emissions

Details

Title: Subtitle: Conjugate observations of quasiperiodic emissions by the Cluster, Van Allen Probes, and THEMIS spacecraft
Creators: F Němec - Charles University
G Hospodarsky - University of Iowa
J. S Pickett - University of Iowa
O Santolík - Charles University
W. S Kurth - University of Iowa
C Kletzing - University of Iowa
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.121(8), pp.7647-7663
DOI: 10.1002/2016JA022774
ISSN: 2169-9380
eISSN: 2169-9402
Number of pages: 17
Grant note: NASA (NNX14AB10G) JHU/APL (921647) NASA Prime (NAS5-01072; Canadian Space Agency) MSMT (LH 14010; 15304) GACR (15-01775Y)
Language: English
Date published: 08/2016
Academic Unit: Physics and Astronomy
Record Identifier: 9984199775102771

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