Vertical Structure of Negative Ionospheric Storms Studied Using DE-1 Images and ISIS Topside Ionograms

Details Vertical Structure of Negative Ionospheric Storms Studied Using DE-1 Images and ISIS Topside Ionograms Vertical Structure of Negative Ionospheric Storms Studied Using DE-1 Images and ISIS Topside Ionograms

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa22b..05d&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SA22B-05

Physics

0355 Thermosphere: Composition And Chemistry, 2419 Ion Chemistry And Composition (0335), 2435 Ionospheric Disturbances, 2443 Midlatitude Ionosphere, 2481 Topside Ionosphere

Scientific paper

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 during the period of October 19-23, 1981, we have produced images of O/N2 column density ratios. As a result of a large geomagnetic storm that began on October 20, a large region of greatly reduced O/N2 was produced over North America and is evident in several of the O/N2 images for October 22. During the same period there were several overflights of North America by the ISIS-1 satellite with its topside ionograms recorded at the Ottawa receiving station. We have obtained digital copies of these ionograms from the National Space Science Data Center and, with the kind assistance of R. F. Benson at NASA/Goddard Space Flight Center, we have reduced a number of them to topside electron density profiles (EDPs). We have also attempted to model the storm by modifying the neutral density profiles in the Naval Research Laboratory (NRL) MSIS2000 model and using these in conjunction with the SAMI2 ionospheric model, also obtained from NRL. By adjusting the neutral density profiles until the modeled topside EDPs approximately match the ISIS-1 derived topside EDPs we are able to obtain an approximation to the disturbed thermospheric vertical structure associated with a negative ionospheric storm.

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