First THEMIS Results Concerning the Nature and the Role of the Electromagnetic Waves During Substorm Process Versus Radial Distance

Details First THEMIS Results Concerning the Nature and the Role of the Electromagnetic Waves During Substorm Process Versus Radial Distance First THEMIS Results Concerning the Nature and the Role of the Electromagnetic Waves During Substorm Process Versus Radial Distance

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm21c..04l&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM21C-04

Other

2744 Magnetotail, 2772 Plasma Waves And Instabilities (2471), 2790 Substorms, 7829 Kinetic Waves And Instabilities, 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

Current driven instabilities are thought to be the cause of electromagnetic waves with frequency around the proton gyrofrequency in the near-earth plasma sheet. It was suggested that they could be the substorm trigger. Lower hydrid drift instability in the near and mid magnetotail was invoked to provide the anomalous resistivity needed in order that resistive instabilities allow magnetic reconnection to develop in an otherwise collisionless regime. At smaller scale and higher frequencies, whistler mode waves are also expected to act as a dissipation mechanism in the electron diffusion region and/or are considered as signature of fast magnetic reconnection processes. Thus the nature and the role played by electromagnetic waves in the substorm process is still a matter of debate. Taking benefits of the radial distribution of the five THEMIS probes and of the comprehensive set of THEMIS instruments we present the first THEMIS analysis of electromagnetic wave activity during substorms as a function of the radial distance.

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