Multispacecraft Cluster observations of quasiperiodic emissions close to the geomagnetic equator

0441083 - ÚFA 2015 RIV US eng J - Journal Article
Němec, F. - Pickett, J. S. - Santolík, Ondřej
Multispacecraft Cluster observations of quasiperiodic emissions close to the geomagnetic equator.
Journal of Geophysical Research-Space Physics. Roč. 119, č. 11 (2014), s. 9101-9112. ISSN 2169-9380. E-ISSN 2169-9402
R&D Projects: GA ČR GAP205/10/2279; GA MŠMT(CZ) LH11122
Institutional support: RVO:68378289
Keywords : QP emissions * Cluster spacecraft
Subject RIV: BL - Plasma and Gas Discharge Physics
Impact factor: 3.426, year: 2014
http://onlinelibrary.wiley.com/doi/10.1002/2014JA020321/abstract

We present a detailed analysis of three electromagnetic wave events observed by the Cluster Wide-Band Data instruments at frequencies of a few kilohertz, which exhibit a periodic time modulation of the wave intensity (quasiperiodic emissions). The events were measured when crossing the geomagnetic equator at radial distances of about 3-4 R-E during the close separation campaign in July-October 2013. Coincident compressional magnetic field pulsations with the magnitude on the order of a few tenths of nanotesla were detected in two events. Their period corresponded to the modulation period of the quasiperiodic emissions in one event, while it was about double in the other. A possible explanation for this discrepancy between the two periods is given. Although Cluster 1, Cluster 3, and Cluster 4 were close to each other, Cluster 2 was located by more than 0.5 R-E closer to the Earth.
Permanent Link: http://hdl.handle.net/11104/0245308