Response of the Equatorial Ionosphere in the South Atlantic Region to the Great Magnetic Storm of July 15, 2000

Details Response of the Equatorial Ionosphere in the South Atlantic Region to the Great Magnetic Storm of July 15, 2000 Response of the Equatorial Ionosphere in the South Atlantic Region to the Great Magnetic Storm of July 15, 2000

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa61a11b&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SA61A-11

Physics

2415 Equatorial Ionosphere, 2435 Ionospheric Disturbances, 2439 Ionospheric Irregularities

Scientific paper

The effects of the great magnetic storm of July 15, 2000 on the equatorial ionosphere have been studied by ground-based GPS and geostationary satellite measurements of ionospheric total electron content (TEC) and scintillations and in-situ measurements of ion density and ion drift by sun-synchronous polar orbiting DMSP satellites and the recently launched ROCSAT-1 satellite in a low inclination orbit. It is shown that the magnetic storm was associated with a large westward plasma drift in the evening equatorial ionosphere presumably due to the effects of the ionospheric disturbance dynamo. In the presence of the sustained effects of the disturbance dynamo, the Dst index decreased abruptly at the rate of 130 nT/hour for two hours, and became associated with the onset of 250 MHz and L-band scintillations at Ascension Island (150 W) and precipitous TEC decrease at Fortaleza, Brazil (380 W), bounding the narrow longitude region in the South Atlantic. It probably indicates that the abrupt change of the Dst index caused a prompt penetration of the eastward electric field over this limited longitude interval. The DMSP F-14 and F-15 in-situ measurements showed the presence of a severe ion density bite-out extending over  100 latitude around the magnetic equator in the South Atlantic Magnetic Anomaly region. The ROCSAT-1 satellite measured upward and large southward ion drifts in the same sector indicating the ionospheric plasma transport away from this region. At Ascension Island to the east of this region, the ground-based and satellite in-situ measurements showed the presence of plasma bubbles, TEC fluctuations, and amplitude scintillations at 250 MHz and at L-band.

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