Five years of investigation of whistler-mode chorus using the measurements of the Cluster spacefleet

0045556 - ÚFA 2007 RIV NL eng C - Conference Paper (international conference)
Santolík, Ondřej - Gurnett, D. A. - Pickett, J. S. - Parrot, M. - Cornilleau-Wehrlin, N.
Five years of investigation of whistler-mode chorus using the measurements of the Cluster spacefleet.
[Pět let výzkumu emisí typu chorus družicemi Cluster.]
Proceedings of "Cluster and Double Star symposium 5th Anniversary of Cluster in Space". Noordwijk: European Space Agency, 2006, s. 1-8. ISBN 92-9092-909-X.
[Cluster and Double Star Symposium - 5th anniversary of Cluster in space. Noordwijk (NL), 19.09.2005-23.09.2005]
R&D Projects: GA AV ČR IAA301120601; GA ČR GA205/06/1267
Institutional research plan: CEZ:AV0Z30420517
Keywords : Space physics * Waves in plasmas
Subject RIV: BL - Plasma and Gas Discharge Physics

We summarize results obtained during investigation of whistler-mode chorus emissions by the four Cluster pacecraft during their first five years of operation. The results can be divided into several broader categories. (i) Substructure of chorus wave packets have been observed at time scales of 1-40 ms, with decreasing occurrence rate for longer durations. Their growth rate is between 30 and 400 s-1, and amplitudes reach up to 30 mV/m or 300 nT in the disturbed times. Maximum amplitudes are inside the arger chorus wave packets which occur at time scales above 100 ms. (ii) Frequency differences have been observed for chorus wave packets which were simultaneously detected by different spacecraft. These differences have been interpreted as differential Doppler shift from rapidly moving elementary chorus sources at speeds comparable to the parallel velocity of counterstreaming resonant electrons.

Pět let výzkumu emisí typu chorus družicemi Cluster.
Permanent Link: http://hdl.handle.net/11104/0138038