Photodesorption from low-temperature water ice in interstellar and circumsolar grains
Article Abstract:
The absolute ultraviolet photodesorption yield measurements of low-temperature water ice in the laboratory provide the rate of photodesorption of ice in the interstellar dust grains. Interstellar dust grains have a coating of water ice, the thickness of which is not accurately estimated by theoretical methods. The rate of photodesorption enables the determination of optical properties of dust grains in the interstellar medium. The fast rate of photodesorption accounts for the absence of icy mantles on grains in diffuse interstellar clouds.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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Detection of ozone on Saturn's satellites Rhea and Dione
Article Abstract:
Saturn's satellites Rhea and Dione are exposed to irradiation from trapped ions. The galilean moons Ganymede, Erupa and Callisto also experience a similar situation. Laboratory studies have found that the recent tenuous oxygen atmospheres discovered on Europa and Ganymede were predicted by the interaction of charged particle radiation with water ice. Detectable abundances of O3 accumulated within the surface ice. 03 has been identified in spectra of Rhea and Dione, indicating that 03 is no longer unique to Ganymede.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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Rough stuff at Saturn
Article Abstract:
Observations of the hydroxyl radical confirms that water molecules are being ejected from icy bodies in the vicinity of the inner satellites of Saturn. Micrometeorites or cosmic dust erode the main rings of Saturn and help in supplying water to the planet's atmosphere, limiting the lifetime of the rings.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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