Global Enhancements in O/N2 Recorded by the DE-1 FUV Imager During Geomagnetically Disturbed Periods

Details Global Enhancements in O/N2 Recorded by the DE-1 FUV Imager During Geomagnetically Disturbed Periods Global Enhancements in O/N2 Recorded by the DE-1 FUV Imager During Geomagnetically Disturbed Periods

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa62a02s&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SA62A-02

Physics

0310 Airglow And Aurora, 0355 Thermosphere--Composition And Chemistry

Scientific paper

The reported investigation extends one presented at the Fall 2000 AGU meeting that concentrated on substorm-related reductions in O/N2 and coincident ionospheric behavior using measurements of Nmax (maximum electron density designated by NmF2 provided an F2 region is present) obtained by ground-based ionosondes. The period of interest is six consecutive days starting on September 24, 1981 within which a geomagnetic storm occurred with onset on the 26th. In addition to numerous thermospheric disturbances characterized by reductions in O/N2 (sub-auroral to middle latitudes), mid-to-low latitude enhancements in O/N2 are also observed that are more global and less structured. Percentage changes in the enhancement from quiet-time values are typically less than 20% in contrast to much larger changes in well-developed regions of reduced O/N2. Several instances of positive ionospheric effects are observed that are in phase with coincident O/N2 enhancements, but the coupling is less convincing than that between negative ionospheric effects and O/N2 reductions. It is, nevertheless, seen often enough in this work to argue that compositional effects in addition to dynamical effects must be considered in addressing the causes of long-duration positive ionospheric storm behavior.

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