Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa31b..07l&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SA31B-07
Physics
2415 Equatorial Ionosphere, 2435 Ionospheric Disturbances, 2447 Modeling And Forecasting
Scientific paper
We use two chains of GPS receivers in the Asian (120\deg E) and American (70\deg W) sectors to simultaneously observe the variation of the low latitude ionosphere during the disturbance periods. 10 storm events with Dst drops to less than -200 nT during 2000 ˜ 2003 have been monitored by the two GPS receiver chains. Large expansion of the equatorial ionization anomaly (EIA) due to the penetrating electric field is seen during the initial phase in every storm event followed by the suppression of the EIA after the storm main phase. In some events, enhanced electron densities in the EIA peaks are seen during the recovery phase. Observations also show seasonal asymmetry of the EIA densities and locations during both expanding and suppression of the EIA. We compare the GPS TEC with simulation results from the Sheffield University Plasmasphere Ionosphere Model (SUPIM) to explain the change of the low-latitude plasma transport due to the storm time electric field, neutral wind, as well as effects of storm-time changes in neutral composition.
Bailey Graham J.
Lin Chaney
Liu Jinjie
Richmond Arthur D.
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