Cluster inner magnetosphere close separation campaign: quasiperiodic emissions

0452305 - ÚFA 2016 IT eng A - Abstract
Němec, F. - Pickett, J. S. - Santolík, Ondřej - Hospodarsky, G. - Kurth, W. - Kletzing, C.
Cluster inner magnetosphere close separation campaign: quasiperiodic emissions.
Cluster 15th and Double Star 10th anniversary workshop. Venice: CAA - ESA, 2015. s. 42-43.
[Cluster Workshop /25./. 12.10.2015–16.10.2015, Venice]
Institutional support: RVO:68378289
Keywords : inner magnetosphere electromagnetic waves * cluster WBD instruments
Subject RIV: BL - Plasma and Gas Discharge Physics
http://caa.estec.esa.int/images/cluster_workshops/25/Cluster25_abstract_book4.pdf

We present an analysis of three electromagnetic wave events observed by the Cluster WBD 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 Earth radii during the close separation campaign in July-October 2013. Coincident compressional magnetic field pulsations with the magnitude on the order of a few 43 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. Finally, it is shown that the EMFISIS wave instruments onboard the Van Allen Probes spacecraft observe a similar quasi-periodic modulation of the wave intensity for some of the events detected by Cluster.
Permanent Link: http://hdl.handle.net/11104/0253389