Correlation between proton anisotropy and magnetic field direction in the distant geotail

Details Correlation between proton anisotropy and magnetic field direction in the distant geotail Correlation between proton anisotropy and magnetic field direction in the distant geotail

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11.1038k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 11, Oct. 1984, p. 1038-1041. Sponsorship: Bundesministerium für Forschung un

Physics

6

Anisotropic Media, Energetic Particles, Geomagnetic Tail, Magnetic Field Configurations, Protons, Neutral Sheets, Space Plasmas, Statistical Analysis

Scientific paper

A statistical analysis has been conducted of the anisotropy of suprathermal protons and the polarity of the magnetic field during April 10-16, 1983. At this time, ISEE-3 was at lunar distances in the geomagnetic tail of the earth, and well within the nominal magnetopause. The first-order anisotropy is presently correlated with the latitude angle and the z-component of the magnetic field. The anisotropy direction's frequency distribution is strongly peaked in the earthward and tailward direction, indicating fast earthward and tailward flows. For large anisotropies, and within 5 earth radii of the nominal neutral sheet position, a strong correlation is found between the earthward-streaming suprathermal protons and the northward polarity of the magnetic field; large tailward anisotropies are generally correlated with southward magnetic field polarity. This correlation is most simply interpreted in terms of a neutral line or reconnection model.

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