Unexpected features of the ion precipitation in the so-called cleft/low-latitude boundary layer region - Association with sunward convection and occurrence on open field lines

Details Unexpected features of the ion precipitation in the so-called cleft/low-latitude boundary layer region - Association with sunward convection and occurrence on open field lines Unexpected features of the ion precipitation in the so-called cleft/low-latitude boundary layer region - Association with sunward convection and occurrence on open field lines

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9811161n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A7, p. 11,161-11,176.

Physics

25

Boundary Layer Plasmas, Geomagnetism, Ion Distribution, Lines Of Force, Particle Precipitation, Polar Caps, Energy Spectra, Exos-D Satellite, Plasma Dynamics

Scientific paper

The Akebono (EXOS D) observations of plasma, electric field, and magnetic field during the dawn-dusk crossings across the dayside polar cap at altitudes of 7500 to 10,000 km are used to study ion precipitations along the boundary of the polar cap. The ion precipitations in morning and evening sectors along the polar cap boundary are found to be associated with the sunward convection at these heights; judging from the presence of the polar rain the high-latitude part of these precipitations occur in the region of open field lines. Association with the sunward convection and occurrence on open field lines contradicts the view that these ions originate from the low-latitude boundary layer on closed field lines. It is proposed that these ions be designated as circumpolar ion precipitation in order to avoid questionable presumptions on their source region.

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