Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p33a1561k&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #P33A-1561
Physics
Plasma Physics
[6213] Planetary Sciences: Solar System Objects / Dust, [6280] Planetary Sciences: Solar System Objects / Saturnian Satellites, [7800] Space Plasma Physics
Scientific paper
Enceladus resides deep within Saturn's magnetosphere. The magnetospheric plasma incident on the satellite is absorbed, forming a thermal plasma wake downstream of the moon, and a cavity extending north-south in higher energy populations. When the Cassini spacecraft crosses Enceladus's L-shell, these cavities are observed as brief dropouts in energetic particle fluxes, termed microsignatures. A survey of thermal plasma observations by the Cassini Plasma Spectrometer's Electron Spectrometer (CAPS-ELS) instrument has revealed the existence of various features in low energy electrons close to and sometimes during the traversal of microsignatures. These features vary in characteristics; some present themselves as a set of discrete spikes, covering electron energies of ~9-15eV and lasting, intermittently, up to tens of minutes. Others, dispersed in time according to energy, show evidence of injection events. We present the results of a survey of these perplexing features, suggest possible causes for their occurrence including important clues from close Enceladus flybys.
Arridge Christopher S.
Coates Andrew J.
Fazakerley Andrew N.
Jones Geraint H.
Kanani S. J.
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