Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa12b0683d&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA12B-0683
Physics
0355 Thermosphere: Composition And Chemistry, 2427 Ionosphere/Atmosphere Interactions (0335), 2435 Ionospheric Disturbances, 2443 Midlatitude Ionosphere, 2447 Modeling And Forecasting
Scientific paper
A major ionospheric storm occurred over Europe and Asia on October 14, 1981, as a consequence of a geomagnetic storm that began with an SSC at 2240 UT on October 13. The maximum negative excursion of Dst (-133 nT) occurred at 0600 UT on October 14. Using an algorithm developed by Strickland et al. [J. Geophys. Res., vol. 104, no. 3, pp. 4251-4266, 1999] and DE-1 FUV images taken near 0540 UT on October 14, Strickland, Daniell, and Craven [J. Geophys. Res., in press, 2001] observed a large region of reduced thermospheric O/N2, which correlated well with the negative ionospheric storm observed in ground based ionosonde data obtained from NGDC. A preliminary report on modeling the fo}F{2 data from Podkamennaya, Russia, during the ionospheric storm was presented at the Fall 2000 AGU meeting and has been accepted for publication [Daniell and Strickland, J. Geophys. Res., in press, 2001]. Here, a more complete analysis of fo}F{2 data and hm}F{2 data (estimated from M3000 using the Dudeny algorithm) from all available ionosonde stations in the region of reduced O/N2 using a first principles ionospheric model coupled to a modified version of the MSIS-86 thermospheric model and the HWM-90 wind model will be presented. We will quantitatively characterize the spatial extent and temporal evolution of the thermospheric and ionospheric disturbances during the storm. Limitations of our modeling approach will also be discussed as well as how they might be overcome using a coupled thermosphere-ionosphere model. Implications for monitoring ionospheric storms using satellite-based FUV imaging techniques will also be addressed.
Daniell Robert E.
Strickland Douglas J.
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