TIME-DEPENDENT STRUCTURE OF THE UPPER ATMOSPHERE

摘要: Abstract The physical properties of the upper atmosphere are determined mainly by heat conduction, sources and barometric law. An analysis integro-differential equation which describes these processes has been carried out. It is found that heating thermosphere due to absorption solar extreme ultraviolet (EUV) radiation alone cannot explain observed diurnal variation density temperature, since it would yield a maximum at about 17h local time, instead 14h where observed. Secondly, if EUV flux adjusted give average then in be much too large compared with amplitude. Thirdly, require an extremely high efficiency for conversion into heat, we compare required Hinteregger's measurements flux. Thus, necessary have another source addition EU...