THEMIS Observations of A Series of Hot Flow Anomaly Events

Details THEMIS Observations of A Series of Hot Flow Anomaly Events THEMIS Observations of A Series of Hot Flow Anomaly Events

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm31b1523z&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM31B-1523

Physics

Plasma Physics

[2772] Magnetospheric Physics / Plasma Waves And Instabilities, [7811] Space Plasma Physics / Discontinuities, [7845] Space Plasma Physics / Particle Acceleration, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

A series of 7 Hot Flow Anomaly Events (HFAs) has been observed by THEMIS spacecraft upstream in 12 hours on August 19, 2008. Both young HFAs (no shocks at edges, two population in ion distribution) and mature HFAs (strong shocks at edges, one hot population in ion distribution) have been observed. All 7 HFAs are associated with strong (0.1mV/m) electrostatic waves at two frequency bands, i.e., 128-256 HZ and 0.5-1KHZ. For young HFAs, electrostatic waves were observed throughout the events. However these waves were only observed at edges of mature HFAs and strongly damped at the center. The two possible electrostatic waves at these frequencies are ion acoustic waves and lower hybrid waves and they are possible source of ion and electron heating inside HFAs.

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