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  • 1
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    The First Six Months of Iapetus Observations by the Cassini ISS Camera (2005)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Since Saturn arrival in June 2004, Iapetus has been studied intensively by the Cassini ISS camera [1] at various ranges. The first of two relatively close flybys in the primary mission occurred on Dec 31, 2004 at an altitude of approx.123,400 km over the northern leading hemisphere, resulting in images with a minimum pixel scale of 740 m. Detailed results of this flyby are given in [2], while this abstract covers the observations obtained earlier. Among the most important discoveries are: (a) Four giant impact basins with diameters between 390 and 550 km were detected, three of them are located in the dark terrain [3]. (b) Data revealed a 〉1300 km long ridge that marks exactly Iapetus' equator within the dark terrain. Individual mountains within the western part of the ridge reach heights of approx.20 km over surrounding terrain [3]. (c) Impact craters were confirmed to be the main geological feature within the dark terrain and at high southern latitudes. (d) There are numerous craters with dark walls roughly facing towards the central parts of the dark hemisphere [3]. (e) Almost all parts of Iapetus have been imaged at least at low resolution (〈 60 km/pxl).
    Keywords: Geophysics
    Type: Lunar and Planetary Science XXXVI, Part 4; LPI-Contrib-1234-Pt-4
    Format: application/pdf
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  • 2
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    Thermal signature, eruption style, and eruption evolution at Pele and Pillan on Io (2001)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: The Galileo spacecraft has been periodically monitoring volcanic activity on Io since June 1996, making it possible to chart the evolution of individual eruptions.
    Keywords: Geophysics
    Type: Journal of Geophysical Research; Volume 106; no. E12; 33079-33103
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  • 3
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    Volcanic Activity at Tvashtar Catena, Io (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-11
    Description: Tvashtar Catena (63 N, 120 W) is one of the most interesting features on Io. This chain of large paterae (caldera-like depressions) has exhibited highly variable volcanic activity in a series of observations. Tvashtar is the type example of a style of volcanism seen only at high latitudes, with short-lived Pele-type plumes and short-lived by intense thermal events. Evidence for a hot spot at Tvashtar was first detected in an eclipse observation in April 1997 (orbit G7) by the Solid State Imager (SSI) on the Galileo Spacecraft. Tvashtar was originally targeted for observation at higher resolution in the close flyby in November 1999 (I25) because of its interesting large-scale topography. There are relatively few but generally larger paterae at high latitudes on Io. I25 images revealed a 25 km long, 1-2 km high lava curtain via a pattern of saturation and bleeding in the CCD image, which requires very high temperatures.
    Keywords: Geophysics
    Type: Lunar and Planetary Science XXXV: Io, with a Dash of Titan; LPI-Contrib-1197
    Format: text
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  • 4
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    Relationships Between Paterae, Mountains, and Hotspots on Io from a Global Database (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-11
    Description: Now that the Galileo spacecraft s tour of the Jupiter system is over, we seek to integrate all available datasets in the hopes of understanding Io as completely as possible. We have compiled information about the morphologies and locations of paterae (volcano-tectonic depressions), mountains, and hotspots on Io in a single database. It is our hope that an analysis of the spatial and temporal relationships between these features will provide more indications of the nature of the crust of Io and the mechanisms leading to these features formation. Since Io s tidal heat escapes through its crust, more knowledge about the crust will lead to an understanding of internal processes, such as magma generation and delivery to the surface, and magnitude and orientation of internal stresses.
    Keywords: Geophysics
    Type: Lunar and Planetary Science XXXV: Io, with a Dash of Titan; LPI-Contrib-1197
    Format: text
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  • 5
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    Clementine Global Geodetic/Cartographic Accuracy (1994)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Keywords: Geophysics
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  • 6
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    Polar Cap Disturbances: Mesosphere and Thermosphere-Ionosphere Response to Solar-Terrestrial Interactions (2003)
    In:  Other Sources
    Details
    Publication Date: 2019-07-10
    Description: The Polar Cap is the Upper-Atmosphere cum Mag-netosphere region which is enclosed by the poleward boundary of the Auroral Oval and is threaded by open geomagnetic tield lines. In this region, there is normally a steady precipition (Polar "drizzle") of low energy (w 300eV) electrons that excite optical emissions from the ionosphere. At times, enhanced ionization patches are formed near the Dayside Cusp regions that drift across the Polar Cap towards the Night Sector of the Auroral Oval. Discrete auroral arcs and auroras formed during Solar Magnetic Cloud (SMC)/Coronal Mass Ejection (CME) events are also observed in the Polar Cap. Spectrophotometric observations of all these Polar Cap phenomena provide a measure of the average energy as well a energy flux of the electrons precipitating in the Polar Cap region during these disturbances. Such measurements also point to modulations of the Polar Cap Mesosphere-Lower Thermosphere (MLT) air density and temperature by zonally symmetric tides whose Hough functions peak in the Polar region. MLT cooling during Stratospheric Warming events and their relation to Polar Vortex and associated Gravity wave activities are also observed at the Polar Cap sites.
    Keywords: Geophysics
    Type: Proceedings of the 28th Annual European Meeting on Atmospheric Studies by Optical Methods; 69-72; Rept-92
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