Abstract:

Auroral intensity ratios of different auroral lines happened in auroral substorm at Antarctic Zhongshan Station on April 8, 1999 was discussed together with the variety of penetrated electron energy. On this basis, it is concluded that the ratio range of I(557.7nm)/I(427.8nm) during quiet period varied from 5 to 22, as well as the range of I(630.0nm)/I(427.8 nm) from 1 to 2.76, and the cause of the change was not the atomic oxygen concentration variety, but maybe the penetrated electron energy variety or other mechanisms; the ratios decreased sharply during the auroral substorm, varied from 1.66 to 6.5 and 0.071 to 1 respectively, which mainly caused by the increase of penetrated electron energy. At the beginning of the auroral substorm, the ratio reached its minimum; means that the penetrated electron energy got its maximum, while auroral substorm wear off, the penetrated electron energy come back to the level of pre-substorm.

Key words: auroral substorm, intensity ratio, electron