Leakage of magnetospheric ions into the magnetosheath along reconnected field lines at the dayside magnetopause

Details Leakage of magnetospheric ions into the magnetosheath along reconnected field lines at the dayside magnetopause Leakage of magnetospheric ions into the magnetosheath along reconnected field lines at the dayside magnetopause

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.1299s&link_type=abstract

Journal of Geophysical Research, vol. 86, Mar. 1, 1981, p. 1299-1304. Bundesministerium für Forschung und Technologie

Computer Science

Sound

56

Energetic Particles, Magnetopause, Magnetosheath, Magnetospheric Ion Density, Particle Precipitation, Space Plasmas, Trapped Particles, Daytime, International Sun Earth Explorer 1, Lines Of Force, Satellite Sounding

Scientific paper

Strong evidence is presented for escape of magnetospheric particles along reconnected field lines into the magnetosheath, using observations of approximately 30 to approximately 120-keV/charge protons and alpha particles made by the Max-Planck-Institut/University of Maryland instrument on Isee 1. During three magnetopause crossings, which have been identified from tangential stress balance analysis as reconnection events, the magnetospheric particle distribution extends well into the magnetosheath, and the particles in the magnetosheath show a strong anisotropy along the magnetic field. The proton to alpha particle ratio in this layer as well as in distinct bursts within the magnetosheath is the same as this ratio within the magnetosphere (at equal energy per charge). It is concluded that the most likely explanation for these observations is that magnetospheric particles are escaping along reconnected field lines into the magnetosheath. It is argued that magnetospheric particles are seen in the magnetosheath up to the reconnection separatrix, and the magnetosheath bursts are interpreted as multiple encounters of this magnetosheath layer by the satellite due to boundary motions.

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