Computer Science – Sound
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm21a0300g&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM21A-0300
Computer Science
Sound
2483 Wave/Particle Interactions (7867), 2716 Energetic Particles: Precipitating, 2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions (2431), 2768 Plasmasphere
Scientific paper
Near equatorial-plane plasmapause crossings (below 5.2 RE) were determined from Explorer-45 electric-field measurements [Maynard and Cauffman, JGR, 78, 4745, 1973]. The crossings were determined when the electric field detector went out of saturation outbound or into saturation inbound. A hard copy listing of these crossings was compiled by N. Maynard and was available to us. This information has now been converted to digital form and is available on-line from the National Space Science Data Center. We plan to use these data, in conjunction with ISIS-2 ion mass spectrometer and ISIS-1 and -2 topside-sounder measurements, to infer H+ dominance through the low-latitude trough boundaries in order to address the ambiguity in the literature as to the relationship between midlatitude trough structures and the plasmapause. Some studies have shown a close relationship between the electron-density trough and the plasmapause, e.g., the comparison of ionospheric tomographic imaging and EUV/IMAGE plasmapause determinations by Yizengaw and Moldwin [GRL, 32, L09105, 2005], while others show only a rough correlation, e.g., the comparison of Explorer-45 plasmapause crossings and Ariel-4 and ISIS-2 ionospheric data by Grebowsky et al. [Planet. Space Sci., 24, 1177, 1976]. The magnetic-field models in these databases were very simple, however, and didn't account for inflation of the equatorial fields. Explorer-45, ISIS-1 and ISIS-2 orbit data have been added to the GSFC Space Physics Data Facility SSCWeb orbits/conjunctions system so that we are now able to search for magnetic conjunction between these satellites, using up-to-date magnetic-field models, and then select cases where a plasmapause crossing is accompanied by ion density measurements and/or electron-density profiles on the same field line in the ionosphere.
Benson Robert F.
Bilitza Dieter
Grebowsky Joseph M.
Shah Sanket S.
Webb Phillip A.
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