The distribution of reconnection geometry in flux transfer events using energetic ion, plasma and magnetic data

Details The distribution of reconnection geometry in flux transfer events using energetic ion, plasma and magnetic data The distribution of reconnection geometry in flux transfer events using energetic ion, plasma and magnetic data

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.3843d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, June 1, 1984, p. 3843-3854. Research supported by the Max-Planck-Gese

Physics

84

Geomagnetism, Ion Currents, Magnetopause, Magnetospheric Ion Density, Space Plasmas, Anisotropy, Daytime, International Sun Earth Explorer 2, Magnetic Equator, Magnetic Signatures, Magnetohydrodynamic Flow, Magnetosheath

Scientific paper

The distribution of energetic ion anisotropies in flux transfer events (FTEs) about the dayside magnetopause has been determined for ISEE 2 crossings of the boundary in 1977 and 1978. When the events are sorted according to the sign of the east-west component of the magnetic field in the magnetosphere, a clear correlation is observed on the northern morningside. When the field is eastward, particles flow antiparallel to the field, implying field line connection to the Northern Hemisphere; when the field is westward, the opposite is true. On the afternoonside, the particle anisotropies are correlated with latitude. Explanations for this pattern are discussed which involve FTE formation at low latitudes with subsequent motion at a velocity given by the vector superposition of the Alfven velocity from the release of magnetic tension and the magnetosheath bulk flow velocity. Evidence that the geomagnetic and not the geocentric solar magnetospheric equator is the source of FTEs is considered.

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