The origin of Earth's foreshock waves

Details The origin of Earth's foreshock waves The origin of Earth's foreshock waves

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsm33b..03e&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #SM33B-03

Physics

2154 Planetary Bow Shocks, 2159 Plasma Waves And Turbulence, 2784 Solar Wind/Magnetosphere Interactions, 7829 Kinetic Waves And Instabilities, 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

In this work we make use of kinetic theory to study the origin of low frequency compressive waves (shocklets) and high frequency waves (~ 1 Hz) observed within the Earth's foreshock using Cluster data. Empirical dispersion points obtained with the Wave Telescope Technique are presented and compared with kinetic dispersion relations for the ion/ion RH and LH resonant instabilities. We also performed a detailed characterization of the observed waves and present ion distributions associated with the waves. A very good agreement was found between the data and the theoretical curves for RH and LH observed shocklets, which probes that these RH (LH) compressive waves are generated by ion/ion RH (LH) kinetic instabilities. In contrast, 1 Hz waves' properties did not fit any instability due to local ions, this clearly supports previous hypothesis that upstream whistler modes are generated at planetary shocks.

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