On existence of the E-W asymmetry in the optical solar corona

The E-W asymmetry has been studied with the use of corona observation data in the green line within the period of 1946-2000. The data were obtained at the Kislovodsk station. Our main result is the following: on average, the positive E-W asymmetry is observed in the course of almost the entire given period except for 3 years (1994-1996). Temporal variations of the E-W asymmetry for certain periods coincide with those for flares. Seasonal variations of the E-W asymmetry revealed in previous papers have not been confirmed. We can conclude that if seasonal variations of the E-W asymmetry in corona exist, their amplitudes are smaller or comparable to instrumental errors, errors caused by atmospheric variations during the observation period and by difference in corona-intensity measuring system at different observatories.