STIS UV Imaging Spectroscopy of Io: First Results

Details STIS UV Imaging Spectroscopy of Io: First Results STIS UV Imaging Spectroscopy of Io: First Results

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.7003m&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #70.03; Bulletin of the American Astronomical Society, Vol. 29, p.1316

Astronomy and Astrophysics

Astronomy

Scientific paper

The Space Telescope Imaging Spectrograph (STIS) obtained quasi-monochromatic images of far-UV emissions from Io's atmosphere and surrounding torus gas on September 26, 1997, when the satellite was near western elongation. The observations were acquired using the 52''{x}2'' STIS aperture centered on Io's 1.1'' diameter disk and aligned 43(deg) to the east of Jovian north. With the field of view of the detectors limiting the useful slit length to 25'', the G140M and G230M medium-dispersion STIS gratings produced isolated 25''{x}2'' images for different spectral lines. For sufficiently narrow lines the images show the spatial distribution of emissions in the dispersion direction as well as along the slit. High quality images of the OI]1355.6 Angstroms/1358.5 Angstroms and SI]1900.3 Angstroms/1914.7 Angstroms doublets were obtained along with a fainter image of the SI1388.7 Angstroms multiplet. Preliminary analysis shows a thin layer of emission outlining Io's limb with a localized brightening near Io's equatorial limbs. This airglow pattern is qualitatively consistent with recent visible-band images obtained by the Galileo spacecraft's Solid State Imager (Belton et al., Science 274, 5286 (1996)) and OI6300.3 Angstroms emission images by the Wide Field and Planetary Camera 2 (Trauger et al 1997).

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