Other
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa52a03w&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SA52A-03
Other
2415 Equatorial Ionosphere, 2435 Ionospheric Disturbances, 6934 Ionospheric Propagation (2487)
Scientific paper
A very intense geomagnetic storm during 6-8, 2000 was recorded with a sudden commencement at 1640 UT April 6, a main phase lasting about 8 hours, and a recovery phase lasting 2-3 days. The Dst index decreases up to 300 nT. GPS TEC data, covering 10-50o geographical latitudes in Mainland China longitudes, together with digisonde data from two low latitude stations Wuhan (30.6oN; Mag. Lat. 20.0oN) and Chungli (25.0oN; Mag. Lat. 14.3oN) have been analyzed. It is found that (1) for latitudes >35o, TEC deviations to its reference appeared during the main and the early recovery phases, and propagated toward low latitudes. This typical behavior has been explained as the result of thermospheric circulation and composition changes related to the storm. (2) For latitudes <35o, TEC deviations appeared just after the sudden commencement, and the density deviations occurred negative at 200-450 km altitudes for the two stations. This prompt response may be produced by the increased ring electric current. (3) During the early recovery phase, there are negative TEC deviations at latitudes 20-30o. Electron density showed a relevant negative deviation at altitudes varying with latitude and likely linked with the L-shell, i.e., at 250-450 km for Wuhan and 300 km for Chungli. We speculate that the fountain effects have come into play and been modulated by the storm circulation equatorward. (4) Another negative TEC deviation followed at the same latitudes, density decreases, however, occurred at altitudes remaining unchanged for each stations. This storm behavior, different from that in (3), is likely related to the disturbed dynamo effect.
Liu Lin
Ning Bo
Wan Wenjie
Yuan Hu
Zhang Sheng
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