Mathematics – Logic
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa12b0682k&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA12B-0682
Mathematics
Logic
2427 Ionosphere/Atmosphere Interactions (0335), 2435 Ionospheric Disturbances, 2437 Ionospheric Dynamics
Scientific paper
Magnetic storm effects on the ionosphere were investigated using the ion density measurements from the DMSP (Defense Meteorological Satellite Program) F13, 14, and 15 spacecrafts and using total electron content (TEC) maps for a selected interval - the Bastille Day storm of July 15, 2000. During the expansion phase of the storm the negative storm effects developed from the high-latitude region in the northern (summer) hemisphere and then expanded equatorward as far as to the low-latitude region in the southern (winter) hemisphere. At the same time, the positive storm effects were observed in the broad range of middle-latitude region in the southern hemisphere during nighttime. Several hours later a stronger negative storm developed near the south magnetic pole, and its equatorward expansion confined the positive storm extent to a narrow middle-latitude region. The strong summer-to-winter hemisphere neutral wind surge on the nightside expanded the molecule-rich atmosphere to a broad latitude region in the northern hemisphere. On the other hand, owing to the weak equatorward wind surge in the southern hemisphere, the molecule-rich atmosphere expanded vertically producing stronger negative storm effects at narrow high- and middle-latitude regions. The nighttime equatorward neutral wind surge converged and downwelled in the middle-latitude region in the southern hemisphere. The downwelling of molecule-rich atmosphere reduces the recombination rate of the O+ ions with molecular gases causing an increase of O+ density and consequently the total ion density. The observation of positive storm effects in the winter hemisphere and their long duration even after the storm cessation imply that the positive storm is controlled by the change of molecular composition rather than by the change of F layer heights. We will present the results of the analysis of DMSP and TEC observations and show that, for this particular event, the data support this interpretation.
Hariston M. R.
Kil Hyosub
Paxton Larry J.
Pi Xiaoqing
Zhang Yajing
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