Observation of a solar bremsstrahlung bust of 1926 UT, August 11, 1960

An observation has been made with balloon detectors of a radiation increase that can be identified with certainty as a burst of bremsstrahlung originating on the sun during a class 2+ flare. The observation was made simultaneously with identical detectors on a balloon at Minneapolis, Minnesota, at 45° geographic latitude, and at Fort Churchill, Manitoba, Canada, at 58.5° geographic latitude and essentially at the same longitude of 95°W. The instruments consisted of an aluminum-walled ionization chamber filled with argon gas operating on the pulsing electrometer system, an aluminum Geiger counter, and a copper Geiger counter. The two counters were also electronically connected to form a vertical coincidence train.