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Electron density dropout near Enceladus in the context of water-vapor and water-ice
- Farrell, W. M. (author)
- Kurth, W. S. (author)
- Gurnett, D. A. (author)
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- Johnson, R. E. (author)
- Kaiser, M. L. (author)
- Waite, J. H., Jr. (author)
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- (creator_code:org_t)
- 2009
- 2009
- English.
- In: Geophysical Research Letters. - 0094-8276 .- 1944-8007. ; 36:10, s. L10203-
- Journal article (peer-reviewed)
Abstract
Subject headings
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- On 12 March 2008, the Cassini spacecraft made a close encounter with the Saturnian moon Enceladus, passing within 52 km of the moon. The spacecraft trajectory was intentionally-oriented in a southerly direction to create a close alignment with the intense water-dominated plumes emitted from the south polar region. During the passage, the Cassini Radio and Plasma Wave System (RPWS) detected two distinct radio signatures: 1) Impulses associated with small water-ice dust grain impacts and 2) an upper hybrid (UH) resonance emission that both intensified and displayed a sharp frequency decrease in the near-vicinity of the moon. The frequency decrease of the UH emission is associated with an unexpectedly sharp decrease in electron density from similar to 90 cl/cm(3) to below 20 cl/cm(3) that occurs on a time scale of a minute near the closest encounter with the moon. In this work, we consider a number of scenarios to explain this sharp electron dropout, but surmise that electron absorption by ice grains is the most likely process.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- Physics
- Fysik
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Kurth, W. S.
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- Johnson, R. E.
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