Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh12a0414h&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SH12A-0414
Physics
2139 Interplanetary Shocks, 2159 Plasma Waves And Turbulence, 7851 Shock Waves, 7871 Waves And Instabilities
Scientific paper
To date Polar has made several traversals of Earth's bow shock. With Polar's apogee being at 9 RE, these bow shock crossings tend to be extreme. We present electric and magnetic fields from DC to 8000 Hz observed at Earth's bow shock. Polar provides the first 3-axis measurements of electric fields across the shock layer proper, allowing for a better evaluation of the electric field properties than previous missions. Preliminary analysis of shock electric and magnetic fields indicate large amplitude (as large as 20-100 mV/m) electromagnetic waves from the ion cyclotron frequency and above. Large amplitude solitary-like electrostatic waveforms are also seen in the magnetic ramp and into the shock overshoot region. We discuss the characteristics of the electric fields across these shocks, including orientation, polarization, wavelength, parallel electric fields, and relation to fine structure in the magnetic fields. These results provide new insights on shock structure and its relation to plasma energization and thermalization across collisionless shocks.
Bale Stuart D.
Hull Arthur J.
Larson Davin E.
Mozer Forrest S.
Scudder Jack D.
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