Unequal optical emissions between the east and the west part of the solar corona

Abstract We extent the results of previous studies where the east part of the solar corona had been found brighter than the west in most of the cases. In the present article, conclusions which have been derived by data obtained by the Kislovodsk observatory, support very well the aspects which have been stated by previous studies based on the Pic-du-Midi data. It is very hopeful that two data sets obtained by two observatories located far each other and operating in quite different time spans have driven towards the same results. Perhaps this fact gives the right to think seriously on the possibility the east part of the solar corona to be brighter than the west, in most of the cases.