Astrogeology Science Center

Publications

Filter Total Items: 890
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Year Published: 2000

Central Valles Marineris: uncontrolled Mars Global Surveyor (MGS) Mars Orbital Camera (MOC) digital context photomosaic (250 megapixel resolution)

These images were processed from a raw format using Integrated Software for Images and Spectrometers (ISIS) to perform radiometric corrections and projection. All the images were projected in sinusoidal using a center longitude of 70 degrees. There are two versions of the mosaic, one unfiltered (vallesmos.tif), and one produced with all images...

Noreen, Eric
Central Valles Marineris: uncontrolled Mars Global Surveyor (MGS) Mars Orbital Camera (MOC) digital context photomosaic (250 megapixel resolution); 2000; OFR; 2000-374; Noreen, Eric

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Year Published: 2000

Sinus Meridiani: uncontrolled Mars Global Surveyor (MGS) Mars Orbital Camera (MOC): digital context photomosaic (250 megapixel resolution)

These images were processed from a raw format using Integrated Software for Images and Spectrometers (ISIS) to perform radiometric corrections and projection. All the images were projected in sinusoidal using a center longitude of 0 degrees. There are two versions of the mosaic, one unfiltered (sinusmos.tif), and one produced with all images...

Noreen, Eric
Sinus Meridiani: uncontrolled Mars Global Surveyor (MGS) Mars Orbital Camera (MOC): digital context photomosaic (250 megapixel resolution); 2000; OFR; 2000-375; Noreen, Eric

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Year Published: 2000

Geologic map of the Sappho Patera Quadrangle (V-20), Venus

The Sappho Patera quadrangle (V–20) of Venus is bounded by 0° and 30° East longitude, 0° and 25° North latitude. It is one of 62 quadrangles covering the entire planet at a scale of 1:5,000,000. The quadrangle derives its name from Sappho Patera, a large rimmed depression (diameter about 225 km) lying on top of a shield-shaped mountain named...

McGill, George E.
Geologic map of the Sappho Patera Quadrangle (V-20), Venus; 2000; I; 2637; McGill, George E.

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Year Published: 2000

Lunar Transient Phenomena: What do the Clementine Images Reveal?

Lunar Transient Phenomena (LTP) have been reported for at least 450 years. The events range from bright flashes, to reddish or bluish glows, to obscurations. Gaseous spectra and photometric measurements of the events have been obtained. Several theories have been offered as explanations for LTP, including residual volcanic activity or outgassing,...

Buratti, Bonnie J.; McConnochie, Timothy H.; Calkins, Sascha B.; Hillier, John K.; Herkenhoff, Kenneth E.

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Year Published: 2000

Recent planetary topographic mapping at the USGS, Flagstaff: Moon, Mars, Venus, and beyond

We are currently using stereophotogrammetric techniques to compile digital topographic models of parts of the Moon, Mars, Venus, and the asteroid Eros in support of the NASA program of planetary exploration. This work requires the synergistic use of the USGS digital cartographic software system ISIS for data ingestion and calibration steps, along...

Kirk, Randolph L.; Howington-Kraus, Elpitha; Rosiek, Mark R.

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Year Published: 2000

Geologic map of the Carson Quadrangle (V-43), Venus

The Magellan spacecraft orbited Venus from August 10, 1990, until it plunged into the venusian atmosphere on October 12, 1994. Magellan had the objectives of (1) improving knowledge of the geologic processes, surface properties, and geologic history of Venus by analysis of surface radar characteristics, topography, and morphology and (2) improving...

Bender, Kelly C.; Senske, David A.; Greeley, Ronald
Geologic map of the Carson Quadrangle (V-43), Venus; 2000; I; 2620; Bender, Kelly C.; Senske, David A.; Greeley, Ronald

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Year Published: 2000

Digital elevation models derived from small format lunar images

No abstract available.

Rosiek, Mark R.; Kirk, Randolph L.; Howington-Kraus, Elpitha

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Year Published: 2000

Results of the Galileo solid state imaging (SSI) experiment

We present a brief synopsis of the nature of SSI data that was taken during the nominal Galileo mission. Significant results are briefly described. These include evidence for geologic activity on Europa that supports the hypothesis of liquid water under a thin ice shell; a demonstration of the ubiquitous presence of a thick crust and high...

Belton, Michael J.S.; Anger, C.D.; Carr, M.H.; Chapman, C.R.; Davies, M. E.; Greeley, R.; Greenberg, R.J.; Head, J.W.; Klaasen, K.P.; Neukum, G.; Pilcher, C.B.; Thomas, P.C.; Veverka, J.; Gierasch, P.J.; Ingersoll, A.P.; Fanale, F. P.; McEwen, Alfred S.; Morrison, D.; Schubert, G.; Beebe, R.F.; Burns, J.A.; Johnson, T. V.; West, R.A.; Ip, W.; McElroy, Michael; Orton, G.S.

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Year Published: 2000

Compositional analyses of small lunar pyroclastic deposits using Clementine multispectral data

Clementine ultraviolet-visible (UVVIS) data are used to examine the compositions of 18 pyroclastic deposits (15 small, three large) at 13 sites on the Moon. Compositional variations among pyroclastic deposits largely result from differing amounts of new basaltic (or juvenile) material and reworked local material entrained in their ejecta upon...

Gaddis, Lisa R.; Hawke, Bernard Ray; Robinson, Mark S.; Coombs, Cassandra

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Year Published: 2000

Volcanism and ice interactions on Earth and Mars

Volcano/ice interactions produce meltwater. Meltwater can enter the groundwater cycle and under the influence of hydrothermal systems, it can be later discharged to form channels and valleys or cycled upward to melt permafrost. Water or ice-saturated ground can erupt into phreatic craters when covered by lava. Violent mixing of meltwater and...

Chapman, Mary G.; Allen, Carlton C.; Gudmundsson, Magnus T.; Gulick, Virginia C.; Jakobsson, Sveinn P.; Lucchitta, Baerbel K.; Skilling, Ian P.; Waitt, Richard B.

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Year Published: 2000

Mars south polar spring and summer behavior observed by TES: seasonal cap evolution controlled by frost grain size

Thermal Emission Spectrometer (TES) observations of the recession phase of Mars' south polar cap are used to quantitatively map this recession in both thermal and visual appearance. Geographically nonuniform behavior interior to the cap is characterized by defining several small regions which exemplify the range of behavior. For most of the cap,...

Kieffer, Hugh H.; Titus, Timothy N.; Mullins, Kevin F.; Christensen, Phillip R.

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Year Published: 2000

Results of the Imager for Mars Pathfinder windsock experiment

The Imager for Mars Pathfinder (IMP) windsock experiment measured wind speeds at three heights within 1.2 m of the Martian surface during Pathfinder landed operations. These wind data allowed direct measurement of near-surface wind profiles on Mars for the first time, including determination of aerodynamic roughness length and wind friction speeds...

Sullivan, Robert; Greeley, Ronald; Kraft, Michael; Wilson, Gregory; Golombek, Matthew P.; Herkenhoff, Kenneth E.; Murphy, James; Smith, Peter