NEW RADIATION BELT DYNAMICS ACCORDING TO MEASUREMENTS MADE BY THE LYULIN DOSIMETER ON BOARD THE MIR-SPACE-STATION IN 1991

A high sensitivity ''Lyulin'' dosimeter was located on board the MIR S pace Station and has been in operation there since September 1989. Aft er 24 March 1991 two additional stable maxima in Aux channels were obs erved in the south-east part of the South Atlantic Anomaly. These two maxima existed for at least several months. In April additional maxima were localized in the following geographical coordinate regions: lati tude lambda = (-35)/(-50 degrees), longitude phi = 332/16 degrees and lambda = (-46)/(-52 degrees), phi = 360/60 degrees or in corresponding B, L-coordinates: L = 2.1/2.5, B = 0.24/0.27 Gs and L = 2.7/3.1, B = 0.27/0.29 Gs. Appearance of these maxima seems to be closely connected with preceding powerful solar flare events and associated geomagnetic disturbances. After the series of solar Rare events in June 1991 sign ificant enhancement of this new radiation belt formation was observed. Copyright (C) 1996 Published by Elsevier Science Ltd.