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Detailed Reference Information |
Ogura, K. and Kodama, M. (1989). Ghost images of auroral X ray sources observed by directional balloon-borne detectors. Journal of Geophysical Research 94: doi: 10.1029/88JA03843. issn: 0148-0227. |
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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/cm2 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 collimator axis. The maximum spurious contribution occurs for a collimator with ¿20¿ opening angle and 40¿ zenigh angle. The magnitude of the spurious contribution also depends on the atmospheric depth and the threshold energy of the detector. |
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BACKGROUND DATA FILES |
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Abstract |
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Keywords
Atmospheric Composition and Structure, Transmission and scattering of radiation, Solar Physics, Astrophysics, and Astronomy, X rays, gamma rays, and neutrinos, Magnetospheric Physics, Auroral phenomena, Magnetospheric Physics, Energetic particles, precipitating |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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