Variations of Total Cloudiness
during Solar Cosmic Ray Events

S. V. Veretenenko and M. I. Pudovkin

St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199164 Russia

Received December 5, 1994; in final form, May 29, 1995

Abstract—Variations in total cloudiness observed at a number of stations in different latitudinal zones during
flashes of solar cosmic rays (SCR) are investigated. A noticeable increase in cloudiness after the beginning of
a flash has been observed at a number of stations located at a higher latitude than the geomagnetic cutoff for
particles with energies of ~90 MeV. At middle latitudes, the increase in cloudiness precedes a burst of SCR and
may be connected with x-rays from the solar flashes.


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