Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa13a1887j&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA13A-1887
Physics
[5435] Planetary Sciences: Solid Surface Planets / Ionospheres, [6281] Planetary Sciences: Solar System Objects / Titan
Scientific paper
During numerous Titan encounters, when oriented in the local ram direction, the Cassini Plasma Spectrometer's electron sensor, ELS, has detected negatively charged ions in the moon's ionosphere. For many of these encounters, CAPS was actuating, i.e. the instrument was rocked back and forth across the local ram direction, and therefore only sensed ions periodically. During some encounters, it is clear that some negative ion populations do not arrive at the spacecraft from the direction anticipated for ions at rest with respect to Titan, implying motion of the ions within Titan's ionosphere. The relatively high rate at which CAPS-ELS scans across its energy range compared to the rate at which the sensor is actuated leads to oversampling, allowing more information to be extracted concerning the negative ion flow direction than is at first apparent. Here, we present an analysis for several encounters of the negative ion signatures observed during actuation, and report on our attempt to secure the negative ion flow direction from these signatures. The implications of the results for the determination of negative ion winds are discussed.
Coates Andrew J.
Jones Geraint H.
Wellbrock Anne
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