| タイトル | Early evolution of an X-ray emitting solar active region |
| 著者（英） | Leibacher, J. W.; Acton, L. W.; Wolfson, C. J.; Roethig, D. T. |
| 著者所属（英） | Lockheed Missiles and Space Co. |
| 発行日 | 1977-11-01 |
| 言語 | eng |
| 内容記述 | The birth and early evolution of a solar active region has been investigated using X-ray observations from the mapping X-ray heliometer on board the OSO-8 spacecraft. X-ray emission is observed within three hours of the first detection of H-alpha plage. At that time, a plasma temperature of four million K in a region having a density on the order of 10 to the 10th power per cu cm is inferred. During the fifty hours following birth almost continuous flares or flare-like X-ray bursts are superimposed on a monotonically increasing base level of X-ray emission produced by the plasma. If the X-rays are assumed to result from heating due to dissipation of current systems or magnetic field reconnection, it may be concluded that flare-like X-ray emission soon after active region birth implies that the magnetic field probably emerges in a stressed or complex configuration. |
| NASA分類 | SOLAR PHYSICS |
| レポートNO | 78A23014 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/433879 |
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