Mathematics – Logic
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa42a08s&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SA42A-08
Mathematics
Logic
2415 Equatorial Ionosphere, 2431 Ionosphere/Magnetosphere Interactions (2736), 2435 Ionospheric Disturbances, 2439 Ionospheric Irregularities, 2481 Topside Ionosphere
Scientific paper
During intense (Dst < -150) geomagnetic disturbances, Defense Meteorological Satellite Program (DMSP) spacecraft orbiting near 840 km observe the behavior of topside ionosphere physical parameters (ion density and composition, plasma temperatures and drift velocities). Data are reviewed for equatorial crossings at local times near 06, 09, 18 and 21 LT from 1988 to 2000. Over 60 days are found when the Dst index is large, yielding over 1300 satellite passes. Large disruptions to the quiet ionosphere are observed, including several cases when the low-latitude ionosphere essentially vanished. A local-time and longitude dependence is observed, in which the later evening local times and certain longitude sectors appear to be more susceptible to these large-scale density disruptions. The relationship of the disturbance to the relative time of storm onset also is considered.
Burke William J.
Huang Chang-Yin
Rich Frederic J.
Sultan Peter J.
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