| タイトル | A review of observational evidence for short and long term ultraviolet flux variability of the Sun |
| 著者（英） | Heath, D. F. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 1980-01-01 |
| 言語 | eng |
| 内容記述 | Observation of the Sun in the 160 to 400 nm wavelength region reveals no significant broadband variation with solar flares, variability associated with the rotation of active regions, and a possible long term change which may be related to the 11 year sunspot cycle or longer. A continuing ultraviolet solar flux variability below 200 nm was observed from 1969 through the present from satellites, which is modulated at solar rotation rates. Recent observations from Nimbus-7 show the solar flux is varying by significant amounts also in the regions from 200 nm up to the Calcium 2 H-line at 396.8 nm. Typically the flux may vary over a solar rotation from about 10 percent at 160 nm to slightly less than 1 percent at the Ca2 K-line. Results of an evaluation of observations from rockets, satellites, and the ground measurements are discussed. |
| NASA分類 | METEOROLOGY AND CLIMATOLOGY |
| レポートNO | 81N31783 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/419220 |
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