INVESTIGATION OF ABSORPTION OF SOLAR EUV-RADIATION IN THE EARTH'S ATMOSPHERE AT ALTITUDES OF 100-500 KM USING SOLAR IMAGES IN THE EXPERIMENTS TEREK-C (CORONAS-Ⅰ) AND SPIRIT (CORONAS-F)

摘要

The results of measurements of absorption of solar EUV-radiation in the Earth's high atmosphere (100-500 km) using solar images obtained in occultation mode with the TEREK-C telescope on-board the Coronas-Ⅰ satellite (1994) and with the SPIRIT telescope/ spectroheliograph on-board the Coronas-F satellite (launched in 2001) are presented. Use of high resolution attenuated solar EUV images recorded in presence of absorption instead of a total flux from the whole Sun allows to determine attenuation height profiles with an accuracy better than 1 km. Possible effects of geomagnetic activity on EUV-absorption data are discussed.