| タイトル | The scattered solar X-ray background in low earth orbit |
| 著者（英） | Fink, H. H.; Schmitt, J. H. M. M.; Harnden, F. R., Jr. |
| 著者所属（英） | Harvard-Smithsonian Center for Astrophysics|Max-Planck-Inst. fuer Physik und Astrophysik |
| 発行日 | 1988-03-01 |
| 言語 | eng |
| 内容記述 | In order to interpret X-ray observations of the sun-lit earth obtained with the IPC, a detailed model is developed that treats the radiative transfer of solar X-rays in single scattering approximation and employs the relevant scattering processes (elastic Thomson scattering and inelastic fluorescent scattering). The X-ray-bright earth, one of the strongest soft X-ray sources seen by the IPC, can then be understood in terms of solar X-rays scattered in the upper atmosphere. Using the CIRA 1972 Reference Atmosphere, it is possible to account for the observed 'bright earth' X-ray light curves under a variety of different viewing geometries. It is argued that the observed changes in hardness ratio of the scattered radiation can be interpreted as an indication of a change in the ratio of Thomson and fluorescently scattered photons as a function of zenith angle. The relevance of bright earth X-ray observations is further discussed in the context of operating X-ray telescopes in low-earth orbit, as well as in a broader astrophysical context. |
| NASA分類 | ASTRONOMY |
| レポートNO | 88A35248 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/371078 |
|
