Reflected and diffuse ions backstreaming from the earth's bow shock. I Basic properties

Details Reflected and diffuse ions backstreaming from the earth's bow shock. I Basic properties Reflected and diffuse ions backstreaming from the earth's bow shock. I Basic properties

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.4397b&link_type=abstract

(Upstream Wave and Particle Workshop, California Institute of Technology, Jet Propulsion Laboratory, Pasadena, CA, Apr. 15, 16,

Physics

73

Backscattering, Ion Motion, Magnetopause, Solar Wind, Bow Waves, Diffuse Radiation, Flux Density, International Sun Earth Explorer 2, Shock Waves

Scientific paper

Plasma data acquired by the ISEE-2 solar wind experiment are used to carry out the first extended statistical analysis of the basic moments of the ions backstreaming from the earth's bow shock. The analysis is based on 3253 ion spectra, corresponding to a total observation time of about 87 hours. The distinction between the reflected and diffuse populations is confirmed and put on a quantitative basis using the ratio between the bulk velocity and the rms thermal speed of the ions. It is found that the total energy density of the diffuse ions is about 30% larger than that of the reflected ions. It is also shown, on a statistical basis, that quasi-perpendicular shock structures generate beams of reflected ions which propagate along the IMF lines against the oncoming solar wind. Diffuse ions are at least in part originated by the disruption of the reflected beams due to some plasma instability, having a growth time of the order of a few tens of seconds.

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