Propagation of the Hard Solar X-Rays in the Atmosphere (f. Polar Ionosphere) (Proceedings of the Second Symposium on Coordinated Observations of the Ionosphere and the Magnetosphere in the Polar Regions : Part II)

• Main Authors: Koichi OGURA, Masahiro KODAMA
• Format: Article
• Language: English
• Published: National Institute of Polar Research 1980-03-01
• Series: Antarctic Record
• Online Access: https://doi.org/10.15094/00008162

This report briefly summarizes preliminary results of the Monte Carlo calculations in order to simulate the propagation of the hard solar X-rays in the atmosphere. The simulated results were compared quantitatively with the data of the hard solar X-ray event of February 11,1970, which was observed simultaneously at balloon and satellite altitudes. According to these comparisons, the results simulated from the satellite data are well consistent with the balloon data at the time of peak intensity, but show higher fluxes by factor of 7 at maximum in the decaying phase of the event about 1 minute before the sunset for the satellite. These suggest that the satellite-borne X-ray detector recorded a considerable amount of atmospheric scattered photons with primary solar X-rays at a time just before the sunset.