Night-time behavior of 630 nm emission in mid-latitude auroras during strong magnetic storms

Abstract

ABSTRACT Using experimental observations of the airglow in upper atmosphere over East Siberia (52 N, 104 E), an analysis is made of the night behavior of the oxygen line OI 630 nm emission in mid-latitude auroras during severe magnetic storms. Two types of the night behavior of the OI 630 nm emission are found out in mid-latitude auroras during severe magnetic storms, which correspond to different phases of the magnetic storm. It is pointed out that mid-latitude auroras and 630 nm maximum emission perturbations during severe magnetic storms in the above-indicated longitudinal sector are mostly observed in the second half of night. A comparative analysis is made of the daily mean distributions of the Dst –indices (for years 1957-2000) as a functions of the universal time UT at different levels of geomagnetic disturbances, and the time of mid-latitude auroras observed over East Siberia.