Abstract
The behaviour of the oxygen emission at 6300 Å and the heating of the upper atmosphere during geomagnetic storms are compared. If the stability and the lowest value of the time lag are taken for the main criterion, the heating of the upper atmosphere is more clearly associated with D st than with a p indices. During very strong geomagnetic storms the energy, lost by the upper atmosphere due to thermal conductivity downward, is lower than that due to oxygen emission at 6300 Å.
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