| タイトル | Galileo ultraviolet spectrometer experiment - Initial Venus and interplanetary cruise results |
| 著者（英） | Thomas, G. E.; Stewart, A. I. F.; Barth, C. A.; Pryor, W. R.; Hord, C. W.; Simmons, K. E.; Esposito, L. W.; Mcclintock, W. E.; Lane, A. L.; Ajello, J. M. |
| 著者所属（英） | Colorado Univ.|Jet Propulsion Lab., California Inst. of Tech. |
| 発行日 | 1991-09-27 |
| 言語 | eng |
| 内容記述 | The Galileo Extreme Ultraviolet Spectrometer obtained a spectrum of Venus atmospheric emissions in the 55.0- to 125.0-nm wavelength region. Emissions of helium (58.4 nm), ionized atomic oxygen (83.4 nm), and atomic hydrogen (121.6 nm), as well as a blended spectral feature of atomic hydrogen (Lyman-beta) and atomic oxygen (102.5 nm), were observed at 3.5-nm resolution. During the Galileo spacecraft cruise from Venus to earth, Lyman-alpha emission from solar system atomic hydrogen (121.6 nm) was measured. The dominant source of the Lyman-alpha emission is atomic hydrogen from the interstellar medium. A model of Galileo observations at solar maximum indicates a decrease in the solar Lyman-alpha flux near the solar poles. A strong day-to-day variation also occurs with the 27-day periodicity of the rotation of the sun. |
| NASA分類 | LUNAR AND PLANETARY EXPLORATION |
| レポートNO | 91A54161 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/345392 |
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