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James A. Van Allen lab journal, March 1958-September 1959
Page 100
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7/31/1958 General situation on data: Explorer IV (Satellite 1958 E) 1) All detectors working splendidly. 2) 1.4 g/cm 2 of Ph around the shielded counter reduces the counting rate only mildly at the higher altitudes i.e. ~factor of 2!! 3) Detector A (pulsescintillation channel) giving fluxes ~ (10 exponent 4)/((cm squared) second) sterad at E > 600 kev. ~1500 km altitude latitude ~ 12 degrees [North?]
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7/31/1958 General situation on data: Explorer IV (Satellite 1958 E) 1) All detectors working splendidly. 2) 1.4 g/cm 2 of Ph around the shielded counter reduces the counting rate only mildly at the higher altitudes i.e. ~factor of 2!! 3) Detector A (pulsescintillation channel) giving fluxes ~ (10 exponent 4)/((cm squared) second) sterad at E > 600 kev. ~1500 km altitude latitude ~ 12 degrees [North?]
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