Ground-based optical observations of daytime auroral emissions from Antarctica

Abstract

First results obtained from ground-based observations on daytime amoral emission intensities from the Indian station, Maitri, in Antarctica, are presented and discussed. These results show striking increases in intensities in all the emissions (viz. low-and high-energy electron-induced and proton-induced emissions), during noon hours in a latitudinal region near the plasmapause and far from the conventional cusp zone. Wave-like disturbances are seen on moderately disturbed days in proton-induced emissions. Plausible causes for such enhancements and disturbances are discussed.