Osaka Shin-Ai Jogakuin
College of Science, Rikkyo University
Faculty of Science, Osaka City University
Faculty of Science, Osaka City University
College of Science, Rikkyo University
Riken
Faculty of Engineering, University of Miyazaki
Institute of Space and Astronautical Science (ISAS)
Dependence of the atmospheric hard X-rays observed by The Polar Patrol Balloon (PPB#6) on Magnetic Local Time have been studied. The atmospheric hard X-rays showed the maximum counting rate and a relatively soft spectrum in the vicinity of midnight. These results support that the cut-off rigidity will disappear at night side in the high Invariant Latitude region. The atmospheric hard X-ray observations also show an excess emission the low energy band above a simple extrapolation from the high energy band. The maximum excess rate was seen at about six in MLT.
南極域での大気硬X線の磁気地方時依存性
SA0200097.pdf
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