Properties of low frequency waves inside hot flow anomaly cavities

Details Properties of low frequency waves inside hot flow anomaly cavities Properties of low frequency waves inside hot flow anomaly cavities

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm53a1648t&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM53A-1648

Physics

2109 Discontinuities (7811), 2154 Planetary Bow Shocks, 2159 Plasma Waves And Turbulence

Scientific paper

Hot flow anomalies (HFAs) are regions of hot and highly deflected ion flow near the bow shock. They are believed to come from interaction between the bow shock and tangential discontinuities in the interplanetary magnetic field. This study is focused on the low frequency wave properties inside two HFAs at different stages of evolution, observed by the Cluster spacecraft on 2. April 2002. The k-filtering technique could applied in this study thanks to the simultaneous multi-point measurements of the Cluster satellites. In the HFA that was in an early stage of its evolution, the observed wave activity was interpreted as a combination of inherent fluctuation in the solar wind and those of a plasma component that had been specularly reflected at the Earth's bow shock. The amplitude of these fluctuations had been increased which probably was the effect of a plasma beam instability. In the more evolved HFA, the wave field was found to be less complex in terms of the number of wave modes. Instead a periodicity was found in the wave number distribution, and it had a period that suggests that it came from the geometrical properties of the HFA cavity.

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