Authors: Meier, R.R., H.P. Warren, A.C. Nicholas, J. Bishop, J.D. Huba, D.P. Drob, J.L. Lean, J.M.
Picone, J.T. Mariska, G. Joyce, D.L. Judge, S.E. Thonnard, K.F. Dymond, and S.A. Budzien
Reference: Geo. Res. Lett. 29, 10, 99-1, 2002.
Abstract:
The Sun’s Bastille Day flare on July 14, 2000 produced a variety of geoeffective events. This solar eruption
consisted of an X-class flare followed by a coronal mass ejection that produced a major geomagnetic storm. We have
undertaken a study of this even beginning with an analysis of the effects of the radiative phase of the flare on the
dayglow and the ionosphere. The key new enabling work is a novel method of evaluating the X-ray and extreme
ultraviolet (EUV) solar spectral irradiance changes associated with the flare. We find that the solar radiative
output enhancements modeled during the flare are consistent with measurements of both solar EUV irradiance and far
UV Earth thermospheric dayglow. We use the SAMI2 model to predict global ionospheric changes along a magnetic
meridian that show significantly different northern and southern effects, suggesting that flares can be used to
study ionospheric dynamics.