Delayed entry of solar protons (E/p/ over 0.3 MeV) into the earth's magnetotail

Details Delayed entry of solar protons (E/p/ over 0.3 MeV) into the earth's magnetotail Delayed entry of solar protons (E/p/ over 0.3 MeV) into the earth's magnetotail

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9212115v&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Nov. 1, 1987, p. 12115-12125.

Computer Science

Numerical Analysis

2

Geomagnetic Tail, Magnetopause, Perturbation Theory, Planetary Magnetic Fields, Solar Protons, Magnetosheath, Numerical Analysis, Polar Caps, Polar Orbits

Scientific paper

The delayed entry of solar protons into the earth's magnetotail is studied using simultaneous observations from three earth-orbiting spacecraft of a number of interplanetary proton events which exhibited abrupt and relatively large discontinuities in intensity associated with magnetic field discontinuities. It is found that such protons have immediate access to the magnetosheath and that delay times increase discontinuously from essentially zero in the magnetosheath to tens of minutes as an observing point moves inward across the magnetopause. Well-defined delay times from 30 to 160 min occur for points interior to the magnetotail. The inferred entry points lie at downstream distances of 80-500 R(E). No discernible relationship is found between the direction and sense of the interplanetary magnetic field and the entry times in the northern and southern lobes of the magnetotail or the entry tiems at various distances from its central axis. These results favor some form of an open model of the magnetotail.

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