| タイトル | Coloration and darkening of methane clathrate and other ices by charged particle irradiation - Applications to the outer solar system |
| 著者（英） | Murray, B. G. J. P. T.; Sagan, Carl; Khare, B. N.; Thompson, W. Reid |
| 著者所属（英） | Cornell Univ. |
| 発行日 | 1987-12-30 |
| 言語 | eng |
| 内容記述 | The results of laboratory experiments simulating the irradiation of hydrocarbon-H2O or hydrocarbon-H2O/NH3 clathrates by charged particles in the outer solar system are reported. Ices produced by condensing and boiling liquid CH4 on an H2O frost surface at 100 K or by cocondensing frosts from gaseous mixtures were exposed to coronal-discharge electron irradiation at 77 K, and the spectral properties of the irradiated surfaces were determined. Significant darkening of the initially white ices was observed at doses of 1 Gerg/sq cm, corresponding to 8-500 yrs of irradiation by Uranian magnetospheric electrons on the surfaces of the principal Uranian satellites, or to total destruction of CH4 in the upper 1 mm of the satellite surfaces after 0.05-3.0 Myr. It is estimated that 10 m or more of icy satellite or comet surfaces would be radiation-hardened to a CH4-free ice-tholin mixture over 4 Gyr. |
| NASA分類 | LUNAR AND PLANETARY EXPLORATION |
| レポートNO | 88A26808 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/372414 |
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