Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm12a1200l&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM12A-1200
Physics
2451 Particle Acceleration, 2704 Auroral Phenomena (2407), 2724 Magnetopause, Cusp, And Boundary Layers, 2736 Magnetosphere/Ionosphere Interactions, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
As previously reported, the southern hemispheric outflow rates of 15-eV to 33-keV H+, O+ and He+ ions observed 1996-98 by the TIMAS instrument on the Polar satellite about two R E geocentric distance, near perigee, are significantly less than rates observed by instruments at somewhat higher altitudes, especially the H+ rates. In this paper a comparison is made with TIMAS observations in the northern hemisphere, at 4-9 R E, by scaling local flow densities along magnetic field lines in the combined IGRF-95 internal and Tsyganenko-95 external field models. The northern hemispheric outflow rates are indeed substantially greater within the given energy range, indicating continued acceleration of lower-energy ions above the Polar perigee altitude. Specifically, the northern rates for O+ and He+ ions are, respectively, about 3-5 and 6-10 times greater than their southern counterparts, the larger multiplier associated with summer season (April-September). In absolute numbers, in units of 1025 s-1, the northern outflow rates are in the range of 1-3 for the O+ and 0.3-1 for the He+, the larger numbers in the summer of 1998, about two years past solar minimum. The average Kp is about 2. The northern hemispheric outward flow rate of H+ ions is as much as 30-100 times greater than the southern counterpart, but that is largely due to solar origin ions with net flow away from the cusp region. Unlike the ionospheric H+ ions, the solar ions have much enhanced flow rate during the summer season (by almost a factor of three), presumably because the northern cusp is then tilted more toward the solar wind source.
Collin Henry L.
Lennartsson O. W.
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