Abstract
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 270 km using its O( 1 S) 558 nm green line channel several days each week during 1993. On 2 days close to equinox in 1993 the maximum K p 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 100 K , the green line volume emission rate increase of 30–78%, and the emission rate scale height increase of 5 km , all measured at 250 km in comparisons between storm and non-storm conditions.
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