<title>Variations of 557.7 nm and 630 nm atmospheric emissions in the 23rd solar cycle</title>

Abstract

We present preliminary analysis of experimental data of the nightglow observation of the atomic oxygen 557.7 nm (emitting layer height is 85-115 km) and 630 nm (180-250 km) lines emissions in the 23-rd solar cycle. The experimental data were obtained at ISTP Geophysical observatory near Irkutsk (52° N, 103° E). The 557.7 nm and 630 nm emissions observational data are compared with atmospheric, solar and geophysical parameters. Generally, the 630 nm emission intensity in the 23-rd solar cycle changed in a phase with the solar cycle, increasing from the period of low solar activity to the period of high solar activity. The difference of correlation coefficient between green line intensity and F_10.7 solar radio flux in various phases of the 23-rd solar cycle was marked. During the increasing and maximum phases of the solar cycle the negative correlation between monthly mean values of the 557.7 nm emission intensity and the F_10.7 was revealed. The correlation became positive during the descending phase. Broken phase synchronism of 557.7 nm emission behavior and F_10.7 during the growth and maximum phase of the 23-rd solar cycle is preliminary interpreted by high sensitivity of the atmospheric parameters determining 557.7 nm emission intensity to atmospheric dynamics and various disturbances including the effects from lower atmospheric layers.