NEW RESULTS FOR THE SPACE RADIATION ENVIRONMENT OF MIR-SPACE-STATION OBTAINED BY LIULIN DOSIMETER-RADIOMETER - COMPARISON WITH LET SPECTROMETER NAUSICAA

Since 1988 high sensitivity semiconductor dosimeter-radiometer ''Liuli n'' worked on board of MLR space station. Device measured the absorbed dose rate and the flux of penetrating particles. The analysis of the data hows the following new results: In October 1989 and after March 2 4, 1991, two additional stable maximums in flux channel were observed in the southern-eastern part of South Atlantic Anomaly (SAA). These tw o maximums existed at least several months and seem to be due to trapp ed high energy electron and proton fluxes. In April 1991 additional ma ximums were localized in the following geographical coordinates region s: latitude = (-35 degrees)-(-50 degrees) longitude = 332 degrees-16 d egrees and lat.(-46 degrees)-(52 degrees) long. 360 degrees-60 degrees . Additional maximums diffusion occurs inside radiation belt. Appearan ce of these maximums seems to be closely connected with preceding powe rful solar proton events and associated geomagnetic dynamics of new be lt disturbances. After the series of solar proton events in June 1991 we observed significant enhancement of this new radiation belt formati on. To achieve sufficient accuracy of dose rate predictions in low Ear th orbits the structure and dynamics of new belt should be carefully a nalyzed to be included in a new environment model. From the inter comp arison of the data from ''Liulin'' and French developed tissue equival ent LET spectrometer NAUSICAA in the time period August-November 1992 we come to the following conclusions: Mainly there is good agreement b etween both data sets for absorbed dose in the region of SAA; Differen t situation of the instruments on the station can explain the cases wh en differences' up to 2 times are observed; At high latitudes usually the tissue equivalent absorbed dose observations are 2 times larger th an ''Liulin'' doses.