| タイトル | Variations of the semi-diurnal tidal wind in the meteor region with periods of about 27 and 13.5 days |
| 本文（外部サイト） | http://hdl.handle.net/2060/19880005134 |
| 著者（英） | Greisiger, K. M. |
| 著者所属（英） | Academy of Sciences |
| 発行日 | 1987-08-01 |
| 言語 | eng |
| 内容記述 | Daily values of sunspot number and solar radio emission at 10.7 cm wavelength show a well known strong modulation with a period of 27 days, the Sun's rotation period. Recent satellite measurements revealed the same modulation of the ultraviolet irradiance at wavelength below 300 nm. These UV variations can influence the thermal heating of the ozone layer by altering the chemical composition. Therefore, one can also expect a corresponding variation in the middle atmosphere of the semi-diurnal tide, which is thermally excited essentially by absorption of UV between 200 and 370 nm in the upper ozone layer. Results of radar meteor wind measurements were used to detect a presumable very weak 27 day modulation within the natural and artificial noise of the daily values of the semi-diurnal wind amplitude. The summer period was chosen because of its relatively steady conditions and the maximum amplitudes during the year. The results of this investigation are given and discussed. |
| NASA分類 | GEOPHYSICS |
| レポートNO | 88N14516 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/147858 |
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