Geomagnetic storm heating effects on the low-latitude dayside thermosphere from WINDII observations at equinox

Details Geomagnetic storm heating effects on the low-latitude dayside thermosphere from WINDII observations at equinox Geomagnetic storm heating effects on the low-latitude dayside thermosphere from WINDII observations at equinox

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jastp..64.1393w&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 64, Issue 12-14, p. 1393-1400.

Physics

1

Scientific paper

The response of the neutral thermosphere to geomagnetic storms is an important aspect of the study of ``space weather''. Yet, this response above the magnetic dip equator has rarely been measured on the dayside because a satellite-borne instrument is required. WINDII, the WIND Imaging Interferometer on board UARS, NASA's Upper Atmosphere Research Satellite, measured emission rates and apparent temperatures to altitudes as high as 270km using its O(1S)558nm green line channel several days each week during 1993. On 2 days close to equinox in 1993 the maximum Kp index exceeded 7, and these days were selected for comparison with surrounding days of lesser magnetic activity. Evidence for thermospheric heating is seen in the Doppler broadening increase of 100K, the green line volume emission rate increase of 30-78%, and the emission rate scale height increase of 5km, all measured at 250km in comparisons between storm and non-storm conditions.

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