ROCSAT-1 Satellite Observations of Magnetic Anomaly Density Structures During the Great Magnetic Storm of July 15-16, 2000

Details ROCSAT-1 Satellite Observations of Magnetic Anomaly Density Structures During the Great Magnetic Storm of July 15-16, 2000 ROCSAT-1 Satellite Observations of Magnetic Anomaly Density Structures During the Great Magnetic Storm of July 15-16, 2000

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa21a..04l&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA21A-04

Other

2411 Electric Fields (2712), 2435 Ionospheric Disturbances, 2443 Midlatitude Ionosphere

Scientific paper

Large scale ion density structures were observed by ROCSAT-1 at 630 km altitude over the South Atlantic anomaly (SAA) region during the great magnetic storm of July 15-16, 2000. The observed density structures were confined within 30o in longitude east of the SAA, and co-rotated with the SAA for over 8 hours. The magnetic anomaly density structures (MADS) observed during several successive orbits in the nighttime sector, contained density holes and density pile-ups adjacent to each other. The density holes had a density drop of one to two orders of magnitude below the ambient level and a spatial size of 800 - 1800 km along the satellite path. The density pile-ups typically spanned a spatial size of 2000 ~ 3000 km were characterized with a density enhancement, large density fluctuations and upward drift velocity. In contrast to density pile-ups, density holes did not exhibit noticeable density fluctuations nor upward drift velocity. A common feature of large poleward drifts was noticeable inside both density hole and pile-up structures. The ion drift measurements thus indicate that ions inside the density holes drifted away in the poleward direction rather than the upward direction. The successive observations of density holes on six orbits suggest that the density hole might be initially created near the center of SAA region and then expanded equatorward. The interpretation of MADS is that the ionospheric F2 peak layer was raised to the satellite altitude inside the density pile-up region and stayed below the satellite inside the density hole region. The magnetic anomaly density structures were likely produced as a result of eastward electric fields enhanced by the great storm. The combination of localized polarization electric fields and storm time electric fields at low latitudes in the nightside might be responsible for the ion drifts and the associated anomalous density structures observed by ROCSAT-1 in the F region.

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