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  • 1
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    Seasonal changes in Titan's meteorology (2011)
    Wiley
    Details
    Publication Date: 2011-02-08
    Description: The Cassini Imaging Science Subsystem has observed Titan for ∼1/4 Titan year, and we report here the first evidence of seasonal shifts in preferred locations of tropospheric methane clouds. South-polar convective cloud activity, common in late southern summer, has become rare. North-polar and northern mid-latitude clouds appeared during the approach to the northern spring equinox in August 2009. Recent observations have shown extensive cloud systems at low latitudes. In contrast, southern mid-latitude and subtropical clouds have appeared sporadically throughout the mission, exhibiting little seasonality to date. These differences in behavior suggest that Titan's clouds, and thus its general circulation, are influenced by both the rapid temperature response of a low-thermal-inertia surface and the much longer radiative timescale of Titan's cold thick troposphere. North-polar clouds are often seen near lakes and seas, suggesting that local increases in methane concentration and/or lifting generated by surface roughness gradients may promote cloud formation.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 2
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    The Morphology of Small Fresh Craters on Mars and the Moon (2014)
    Wiley
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    Publication Date: 2014-11-11
    Description: The depth/diameter ratio for new meter- to decameter-scale martian craters formed in the last ~20 years averages 0.23, only slightly deeper than that expected for simple primary craters on rocky surfaces. Large variations in d/D between impact sites indicate that differences between the sites such as target material properties, impact velocity, angle, and physical state of the bolide(s) are important in determining the depth of small craters in the strength regime. On the Moon, the d/D of random fresh small craters with similar diameters averages only 0.10, indicating that either the majority of them are unrecognized secondaries, or some proportion are degraded primaries. Older craters such as these may be shallower due to erosional infilling, which is probably not linear over time but more effective over recently-disturbed and steeper surfaces, processes that are not yet acting on the new martian craters. Brand new meter- to decameter-scale craters such as the martian ones studied here are statistically easily distinguishable as primaries, but the origins of older craters of the same size, such as the lunar ones in this study, are ambiguous.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 3
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    Io's thermal emission from the Galileo photopolarimeter-radiometer (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-05-20
    Description: Galileo's photopolarimeter-radiometer instrument mapped Io's thermal emission during the I24, I25, and I27 flybys with a spatial resolution of 2.2 to 300 kilometers. Mapping of Loki in I24 shows uniform temperatures for most of Loki Patera and high temperatures in the southwest corner, probably resulting from an eruption that began 1 month before the observation. Most of Loki Patera was resurfaced before I27. Pele's caldera floor has a low temperature of 160 kelvin, whereas flows at Pillan and Zamama have temperatures of up to 200 kelvin. Global maps of nighttime temperatures provide a means for estimating global heat flow.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Spencer, J R -- Rathbun, J A -- Travis, L D -- Tamppari, L K -- Barnard, L -- Martin, T Z -- McEwen, A S -- New York, N.Y. -- Science. 2000 May 19;288(5469):1198-201.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10817987" target="_blank"〉PubMed〈/a〉
    Keywords: Darkness ; Extraterrestrial Environment ; Filtration ; *Hot Temperature ; *Jupiter ; Photometry ; *Space Flight ; Sunlight ; *Volcanic Eruptions
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Galileo at Io: results from high-resolution imaging (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-05-20
    Description: During late 1999/early 2000, the solid state imaging experiment on the Galileo spacecraft returned more than 100 high-resolution (5 to 500 meters per pixel) images of volcanically active Io. We observed an active lava lake, an active curtain of lava, active lava flows, calderas, mountains, plateaus, and plains. Several of the sulfur dioxide-rich plumes are erupting from distal flows, rather than from the source of silicate lava (caldera or fissure, often with red pyroclastic deposits). Most of the active flows in equatorial regions are being emplaced slowly beneath insulated crust, but rapidly emplaced channelized flows are also found at all latitudes. There is no evidence for high-viscosity lava, but some bright flows may consist of sulfur rather than mafic silicates. The mountains, plateaus, and calderas are strongly influenced by tectonics and gravitational collapse. Sapping channels and scarps suggest that many portions of the upper approximately 1 kilometer are rich in volatiles.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McEwen, A S -- Belton, M J -- Breneman, H H -- Fagents, S A -- Geissler, P -- Greeley, R -- Head, J W -- Hoppa, G -- Jaeger, W L -- Johnson, T V -- Keszthelyi, L -- Klaasen, K P -- Lopes-Gautier, R -- Magee, K P -- Milazzo, M P -- Moore, J M -- Pappalardo, R T -- Phillips, C B -- Radebaugh, J -- Schubert, G -- Schuster, P -- Simonelli, D P -- Sullivan, R -- Thomas, P C -- Turtle, E P -- Williams, D A -- New York, N.Y. -- Science. 2000 May 19;288(5469):1193-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10817986" target="_blank"〉PubMed〈/a〉
    Keywords: *Extraterrestrial Environment ; Geological Phenomena ; Geology ; Image Enhancement ; *Jupiter ; *Space Flight ; Spectrophotometry, Infrared ; *Volcanic Eruptions
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
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    Planetary science. Active volcanism on Io (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-09-28
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McEwen, Alfred S -- New York, N.Y. -- Science. 2002 Sep 27;297(5590):2220-1.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA. mcewen@lpl.arizona.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12351777" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    Galileo imaging of atmospheric emissions from Io (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-08-07
    Description: The Galileo spacecraft has detected diffuse optical emissions from Io in high-resolution images acquired while the satellite was eclipsed by Jupiter. Three distinct components make up Io's visible emissions. Bright blue glows of more than 300 kilorayleighs emanate from volcanic plumes, probably due to electron impact on molecular sulfur dioxide. Weaker red emissions, possibly due to atomic oxygen, are seen along the limbs, brighter on the pole closest to the plasma torus. A faint green glow appears concentrated on the night side of Io, possibly produced by atomic sodium. Io's disk-averaged emission diminishes with time after entering eclipse, whereas the localized blue glows brighten instead.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Geissler, P E -- McEwen, A S -- Ip, W -- Belton, M J -- Johnson, T V -- Smyth, W H -- Ingersoll, A P -- New York, N.Y. -- Science. 1999 Aug 6;285(5429):870-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85711, USA. geissler@lpl.arizona.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10436151" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; *Extraterrestrial Environment ; *Jupiter ; *Oxygen ; Sodium ; *Sulfur Dioxide
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    A close-up look at Io from Galileo's near-infrared mapping spectrometer (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-05-20
    Description: Infrared spectral images of Jupiter's volcanic moon Io, acquired during the October and November 1999 and February 2000 flybys of the Galileo spacecraft, were used to study the thermal structure and sulfur dioxide distribution of active volcanoes. Loki Patera, the solar system's most powerful known volcano, exhibits large expanses of dark, cooling lava on its caldera floor. Prometheus, the site of long-lived plume activity, has two major areas of thermal emission, which support ideas of plume migration. Sulfur dioxide deposits were mapped at local scales and show a more complex relationship to surface colors than previously thought, indicating the presence of other sulfur compounds.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lopes-Gautier, R -- Doute, S -- Smythe, W D -- Kamp, L W -- Carlson, R W -- Davies, A G -- Leader, F E -- McEwen, A S -- Geissler, P E -- Kieffer, S W -- Keszthelyi, L -- Barbinis, E -- Mehlman, R -- Segura, M -- Shirley, J -- Soderblom, L A -- New York, N.Y. -- Science. 2000 May 19;288(5469):1201-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10817988" target="_blank"〉PubMed〈/a〉
    Keywords: Extraterrestrial Environment ; Hot Temperature ; *Jupiter ; *Spacecraft ; Spectroscopy, Near-Infrared/methods ; Sunlight ; Temperature ; *Volcanic Eruptions
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    Early views of the martian surface from the Mars Orbiter Camera of Mars Global Surveyor (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-03-28
    Description: High-resolution images of the martian surface at scales of a few meters show ubiquitous erosional and depositional eolian landforms. Dunes, sandsheets, and drifts are prevalent and exhibit a range of morphology, composition (inferred from albedo), and age (as seen in occurrences of different dune orientations at the same location). Steep walls of topographic depressions such as canyons, valleys, and impact craters show the martian crust to be stratified at scales of a few tens of meters. The south polar layered terrain and superposed permanent ice cap display diverse surface textures that may reflect the complex interplay of volatile and non-volatile components. Low resolution regional views of the planet provide synoptic observations of polar cap retreat, condensate clouds, and the lifecycle of local and regional dust storms.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Malin, M C -- Carr, M H -- Danielson, G E -- Davies, M E -- Hartmann, W K -- Ingersoll, A P -- James, P B -- Masursky, H -- McEwen, A S -- Soderblom, L A -- Thomas, P -- Veverka, J -- Caplinger, M A -- Ravine, M A -- Soulanille, T A -- Warren, J L -- New York, N.Y. -- Science. 1998 Mar 13;279(5357):1681-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Malin Space Science Systems, Post Office Box 910148, San Diego, CA 92191-0148, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9497280" target="_blank"〉PubMed〈/a〉
    Keywords: Carbon Dioxide ; *Extraterrestrial Environment ; Ice ; *Mars ; Spacecraft
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    Surface and airborne evidence for plumes and winds on triton (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-10-19
    Description: Aeolian features on Triton that were imaged during the Voyager Mission have been grouped. The term "aeolian feature" is broadly defined as features produced by or blown by the wind, including surface and airborne materials. Observations of the latitudinal distributions of the features probably associated with current activity (known plumes, crescent streaks, fixed terminator clouds, and limb haze with overshoot) all occur from latitude -37 degrees to latitude -62 degrees . Likely indicators of previous activity (dark surface streaks) occur from latitude -5 degrees to -70 degrees , but are most abundant from -15 degrees to -45 degrees , generally north of currently active features. Those indicators which give information on wind direction and speed have been measured. Wind direction is a function of altitude. The predominant direction of the surface wind streaks is found to be between 40 degrees and 80 degrees measured clockwise from north. The average orientation of streaks in the northeast quadrant is 59 degrees . Winds at 1- to 3- kilometer altitude are eastward, while those at &8 kilometers blow west.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hansen, C J -- McEwen, A S -- Ingersoll, A P -- Terrile, R J -- New York, N.Y. -- Science. 1990 Oct 19;250(4979):421-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17793018" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    Lunar impact basins and crustal heterogeneity: new Western limb and far side data from galileo (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-01-31
    Description: Multispectral images of the lunar western limb and far side obtained from Galileo reveal the compositional nature of several prominent lunar features and provide new information on lunar evolution. The data reveal that the ejecta from the Orientale impact basin (900 kilometers in diameter) lying outside the Cordillera Mountains was excavated from the crust, not the mantle, and covers pre-Orientale terrain that consisted of both highland materials and relatively large expanses of ancient mare basalts. The inside of the far side South Pole-Aitken basin (〉2000 kilometers in diameter) has low albedo, red color, and a relatively high abundance of iron- and magnesium-rich materials. These features suggest that the impact may have penetrated into the deep crust or lunar mantle or that the basin contains ancient mare basalts that were later covered by highlands ejecta.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Belton, M J -- Head, J W 3rd -- Pieters, C M -- Greeley, R -- McEwen, A S -- Neukum, G -- Klaasen, K P -- Anger, C D -- Carr, M H -- Chapman, C R -- Davies, M E -- Fanale, F P -- Gierasch, P J -- Greenberg, R -- Ingersoll, A P -- Johnson, T -- Paczkowski, B -- Pilcher, C B -- Veverka, J -- New York, N.Y. -- Science. 1992 Jan 31;255(5044):570-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17792379" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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