Observation of the Corotation Deviation of The Io Plasma Torus

Details Observation of the Corotation Deviation of The Io Plasma Torus Observation of the Corotation Deviation of The Io Plasma Torus

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004dps....36.1618k&link_type=abstract

American Astronomical Society, DPS meeting #36, #16.18; Bulletin of the American Astronomical Society, Vol. 36, p.1101

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In order to monitor the mass loading in the Io plasma torus, ground-based Doppler resolved imaging observation of [SII] 671.6 nm emission was carried out using an Imaging Fabry-Perot Interferometer (λ /d λ ˜ 61,000) coupled to a 35 cm Schmitted-Cassaigrain telescope at Haleakala Observatory from February 15 to 20, 2004. Pontius and Hill [1982] showed that the mass loading rate, μ , can be derived by measuring the deviation of ion velocity from the corotation velocity, δ v, and the conductivity of Jovian ionosphere, Σ , with an equation; μ dL = a Σ δ v(L) dL. Based on our observation, maximum corotation deviation varied from 7 km/sec to 3 km/sec at the ribbon region of east side of Jupiter during several hours on February 17. The cororation deviations observed during the whole period appear to have no dependency on Io phase angle nor system III longitude of Io. It is possible that the corotation deviation is controlled by other physical condition(s).

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