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Your search keyword '"Herkenhoff, Ken E."' showing total 4 results
Start Over Author "Herkenhoff, Ken E." Publisher american association for the advancement of science
4 results on '"Herkenhoff, Ken E."'

1. Exploration of Victoria Crater by the Mars Rover Opportunity

Author

Squyres, Steven W., Knoll, Andrew Herbert, Arvidson, Raymond E., Ashley, James W., Bell, James F. III, Calvin, Wendy M., Christensen, Philip R., Clark, Benton C., Cohen, Barabara A., de Souza, Paulo Jr., Edgar, Lauren A., Farrand, William H., Fleischer, Iris, Gellert, Ralf, Golombek, Matthew P., Grant, John A., Grotzinger, John P., Hayes, Alexander G., Herkenhoff, Ken E., Johnson, Jeffrey R., Jolliff, Bradley L., Klingelhöfer, Göstar, Knudson, Amy, Li, Ruogu, McCoy, Timothy J., McLennan, Scott M., Ming, Douglas W., Morris, Richard V., Rice, James W. Jr, Schröder, Christian, Sullivan, Robert J., Yen, Albert, and Yingst, R. Aileen

Abstract

The Mars rover Opportunity has explored Victoria crater, a ~750-meter eroded impact crater formed in sulfate-rich sedimentary rocks. Impact-related stratigraphy is preserved in the crater walls, and meteoritic debris is present near the crater rim. The size of hematite-rich concretions decreases up-section, documenting variation in the intensity of groundwater processes. Layering in the crater walls preserves evidence of ancient wind-blown dunes. Compositional variations with depth mimic those ~6 kilometers to the north and demonstrate that water-induced alteration at Meridiani Planum was regional in scope., Organismic and Evolutionary Biology

Published
2009
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2. In Situ Evidence for an Ancient Aqueous Environment at Meridiani Planum, Mars

Author

Knoll, Andrew, Soderblom, Larry A., Rieder, Renate, Rice, John W., Morris, Richard V., McSween, Harry Y., McLennan, Scott M., Klingelhofer, Gostar, Johnson, Jeffrey R., Herkenhoff, Ken E., Farrand, William H., Crisp, Jeffrey, Clark, Benton C., Christensen, Philip R., Calvin, Wendy, Bell, James F. III, Arvidson, Raymond E., Grotzinger, John P., and Squyres, Steven W.

Abstract

Sedimentary rocks at Eagle crater in Meridiani Planum are composed of fine-grained siliciclastic materials derived from weathering of basaltic rocks, sulfate minerals (including magnesium sulfate and jarosite) that constitute several tens of percent of the rock by weight, and hematite. Cross-stratification observed in rock outcrops indicates eolian and aqueous transport. Diagenetic features include hematite-rich concretions and crystal-mold vugs. We interpret the rocks to be a mixture of chemical and siliciciastic sediments with a complex diagenetic history. The environmental conditions that they record include episodic inundation by shallow surface water, evaporation, and desiccation. The geologic record at Meridiani Planum suggests that conditions were suitable for biological activity for a period of time in martian history., Organismic and Evolutionary Biology

Published
2004
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3. Geological, multispectral, and meteorological imaging results from the Mars 2020 Perseverance rover in Jezero crater.

Author

Bell III, James F., Maki, Justin N., Alwmark, Sanna, Ehlmann, Bethany L., Fagents, Sarah A., Grotzinger, John P., Gupta, Sanjeev, Hayes, Alexander, Herkenhoff, Ken E., Horgan, Briony H. N., Johnson, Jeffrey R., Kinch, Kjartan B., Lemmon, Mark T., Madsen, Morten B., Núñez, Jorge I., Paar, Gerhard, Rice, Melissa, Rice Jr., James W., Schmitz, Nicole, and Sullivan, Robert

Subjects
*IMPACT craters, *SCIENCE conferences, *SCIENTIFIC apparatus & instruments, *SPACE sciences, *WIND erosion, *MARS (Planet), *EARTH sciences, *ICE clouds
Abstract

The article presents a study on the meteorological, multispectral and geological imaging results from the Mars 2020 Perseverance rover's Mastcam-Z instrument in Jezero crater, Mars. Topics discussed include descriptions of the rocks and boulder-forming bedrocks, the intra- and intersol variations in water ice clouds and dust optical depth, and the physiography of the Jezero crater.

Published
2022
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4. The dynamic atmospheric and aeolian environment of Jezero crater, Mars.

Author

Newman, Claire E., Hueso, Ricardo, Lemmon, Mark T., Munguira, Asier, Vicente-Retortillo, Álvaro, Apestigue, Víctor, Martínez, Germán M., Toledo, Daniel, Sullivan, Rob, Herkenhoff, Ken E., de la Torre Juárez, Manuel, Richardson, Mark I., Stott, Alexander E., Murdoch, Naomi, Sanchez-Lavega, Agustín, Wolff, Michael J., Arruego, Ignacio, Sebastián, Eduardo, Navarro, Sara, and Gómez-Elvira, Javier

Subjects
*SAND dunes, *LUNAR craters, *MARS (Planet), *CONVECTIVE boundary layer (Meteorology), *GALE Crater (Mars), *ATMOSPHERIC boundary layer, *SPACE sciences
Abstract

The article discusses that Despite the importance of sand and dust to Mars geomorphology, weather, and exploration, the processes that move sand and that raise dust to maintain Mars' ubiquitous dust haze and to produce dust storms have not been quantified as the missions lack either the necessary sensors or a sufficiently active aeolian environment.

Published
2022
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