Abstract
Following the first satellite observations of enhanced particle flux in the region of the Brazilian Magnetic Anomaly1,2, various attempts have been made to detect effects associated with the precipitation of radiation belt particles over the region of this anomaly at balloon altitudes3. Since 1968 balloon observations of charged particles and X-rays have been made periodically at the Instituto de Pesquisas Espaciais at Sao Jose dos Campos, Brazil. During one of the flights on December 17, 1971, a moderate geomagnetic storm occurred when the balloon was floating at a ceiling altitude of ∼3 mbar. Marked changes in the measured particle flux were observed in association with the changes in the magnetic field. As well as pointing out this correspondence we discuss the observational results in relation to observations made on April 6, 1972, during a magnetically quiet period. To our knowledge this is the first direct detection of particle precipitation in the magnetic anomaly at balloon altitudes.
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