Physics
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.1508o&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Feb. 1, 1989, p. 1508-1514.
Physics
4
Auroral Zones, Balloon-Borne Instruments, X Ray Sources, Atmospheric Diffusion, Collimators, Monte Carlo Method, Radiation Detectors, Radiation Distribution
Scientific paper
Diffusion characteristics of auroral X-rays propagating through the atmosphere have been investigated by means of a Monte Carlo simulation. The results are used to estimate the defocusing effect of multiple photon scatterings on auroral X-ray images detected at balloon altitudes. It is predicted that the auroral X-ray image at an atmospheric depth of 6-14 g/sq cm is occasionally accompanied by a spurious ghost image in the zenith when an auroral X-ray source near the zenith is viewed by a collimated detector inclined with respect to the zenith. The ghost image is enhanced with increasing zenith angle of the collimator axis. The maximum spurious contribution occurs for a collimator with +/- 20-deg opening angle and 40-deg zenith angle. The magnitude of the spurious contribution also depends on the atmospheric depth and the threshold energy of the detector.
Kodama Masahiro
Ogura Koichi
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