Observation of Sulfur Ion Emissions in Io Plasma Torus: Decreasing Emission Intensities of [SII] and Neutral Sodium Cloud

Details Observation of Sulfur Ion Emissions in Io Plasma Torus: Decreasing Emission Intensities of [SII] and Neutral Sodium Cloud Observation of Sulfur Ion Emissions in Io Plasma Torus: Decreasing Emission Intensities of [SII] and Neutral Sodium Cloud

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.2303k&link_type=abstract

American Astronomical Society, DPS meeting #39, #23.03; Bulletin of the American Astronomical Society, Vol. 39, p.452

Astronomy and Astrophysics

Astronomy

Scientific paper

Timescle of change of emission intensity and structure of Io plasma torus is important to understand the supply, transport and loss mechanism of plasma in the Jovian magnetosphere. In order to monitor the variation of heavy ion density, temperature and mass-loading rate in the Io plasma torus (IPT), we made campaign observation of singly charged sulfur ion emissions of IPT ([SII] 673.1nm and 671.6nm) and Iogenic neutral sodium cloud from May 25th through June 21th, 2007. Observation of [SII] emission was made at Haleakala observatory, Maui using a high-dispersion Echelle spectrograph coupled to a 40-cm Schmidt-Cassegrain telescope. Based on the observation that produced 97 spectral dataset, average [SII] emission intensity around the Io's orbit decreased from 500 Rayleighs before June 1st to 200 Rayleighs after June 10th. Though decreasing change is correlated with the emission intensity of Iogenic sodium cloud, the decay timescale of [SII] emissions is much shorter than that predicted by radial diffusion. The result implies that S+ around Io's orbit was not only reduced by radial transport but also by enhancement of loss process of sulfur ions and/or increased ionization that made S+ to higher ionization sates. At the presentation, variation of mass-loading rate derived from the corotation deviation of IPT will also be given.

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