The Mimas ghost revisited: an analysis of the electron flux and electron microsignatures observed in the vicinity of Mimas at Saturn

Details The Mimas ghost revisited: an analysis of the electron flux and electron microsignatures observed in the vicinity of Mimas at Saturn The Mimas ghost revisited: an analysis of the electron flux and electron microsignatures observed in the vicinity of Mimas at Saturn

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983stin...8413056c&link_type=abstract

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Physics

Electrons, Mimas, Signature Analysis, Absorption Spectra, Electrons, Radial Distribution

Scientific paper

An analysis of the electron absorption signature observed by the Cosmic Ray System (CRS) on Voyage 2 near the orbit of Mimas is presented. We find that these observations cannot be explained as the absorption signature of Mimas. Combing Pioneer 11 and Voyager 2 measurements of the electron flux at Mimas's orbit (L=3.1), we find an electron spectrum where most of the flux above approx 100 keV is concentrated near 1 to 3 MeV. The expected Mimas absorption signature is calculated from this spectrum neglecting radial diffusion. A lower limit on the diffusion coefficient for MeV electrons is obtained. With a diffusion coefficient this large, both the Voyager 2 and the Pioneer 11 small-scale electron absorption signature observations in Mimas's orbit are enigmatic. Thus we refer to the mechanism for producing these signatures as the Mimas ghost. A cloud of material in orbit with Mimas may account for the observed electron signature if the cloud is at least 1% opaque to electrons across a region extending over a few hundred kilometers.

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