Multi-point Observations of the Waveform and Propagation of Lion Roars

Details Multi-point Observations of the Waveform and Propagation of Lion Roars Multi-point Observations of the Waveform and Propagation of Lion Roars

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm21b0366y&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM21B-0366

Physics

2728 Magnetosheath, 2772 Plasma Waves And Instabilities (2471)

Scientific paper

Lion roars are intense, short duration packets of whistler mode waves, observed in the magnetosheath. They are typically seen coincident with the magnetic field minima of mirror mode waves. In this study, lion roar activity was observed simultaneously on the four Cluster spacecraft and on the Double Star equatorial (TC1) spacecraft. The Cluster spacecraft were in a tetrahedron formation with approximately 1500km separation, whilst TC1 was 30000km from Cluster, all in the magnetosheath, allowing multi-scale observations of the waves within mirror mode structures. The propagation direction determined from the lion roar waveform measured by the STAFF tri-axial search coil magnetometer is compared to the background magnetic field, and the electron temperature anisotropy estimated from the lion roar frequency ratios is compared to PEACE electron measurements.

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