Search Results - "Hamara, David K."

The Major-Element Composition of Mercury's Surface from MESSENGER X-ray Spectrometry by Nittler, Larry R., Starr, Richard D., Weider, Shoshana Z., McCoy, Timothy J., Boynton, William V., Ebel, Denton S., Ernst, Carolyn M., Evans, Larry G., Goldsten, John O., Hamara, David K., Lawrence, David J., McNutt, Ralph L., Schlemm, Charles E., Solomon, Sean C., Sprague, Ann L.

“…X-ray fluorescence spectra obtained by the MESSENGER spacecraft orbiting Mercury indicate that the planet's surface differs in composition from those of other…”
Get full text

Radioactive Elements on Mercury's Surface from MESSENGER: Implications for the Planet's Formation and Evolution by Peplowski, Patrick N., Evans, Larry G., Hauck, Steven A., McCoy, Timothy J., Boynton, William V., Gillis-Davis, Jeffery J., Ebel, Denton S., Goldsten, John O., Hamara, David K., Lawrence, David J., McNutt, Ralph L., Nittler, Larry R., Solomon, Sean C., Rhodes, Edgar A., Sprague, Ann L., Starr, Richard D., Stockstill-Cahill, Karen R.

“…The MESSENGER Gamma-Ray Spectrometer measured the average surface abundances of the radioactive elements potassium (K, 1150 ± 220 parts per million), thorium…”
Get full text

Major-element abundances on the surface of Mercury: Results from the MESSENGER Gamma-Ray Spectrometer by Evans, Larry G., Peplowski, Patrick N., Rhodes, Edgar A., Lawrence, David J., McCoy, Timothy J., Nittler, Larry R., Solomon, Sean C., Sprague, Ann L., Stockstill-Cahill, Karen R., Starr, Richard D., Weider, Shoshana Z., Boynton, William V., Hamara, David K., Goldsten, John O.

“…Orbital gamma‐ray measurements obtained by the MESSENGER spacecraft have been analyzed to determine the abundances of the major elements Al, Ca, S, Fe, and Na…”
Get full text

Analysis of MESSENGER Gamma-Ray Spectrometer data from the Mercury flybys by Rhodes, Edgar A., Evans, Larry G., Nittler, Larry R., Starr, Richard D., Sprague, Ann L., Lawrence, David J., McCoy, Timothy J., Stockstill-Cahill, Karen R., Goldsten, John O., Peplowski, Patrick N., Hamara, David K., Boynton, William V., Solomon, Sean C.

“…During its three flybys of Mercury, the MESSENGER spacecraft made the first detection of gamma-ray emission from the planet's surface. With a closest approach…”
Get full text

Mars Odyssey Gamma Ray Spectrometer elemental abundances and apparent relative surface age: Implications for Martian crustal evolution by Hahn, Brian C., McLennan, Scott M., Taylor, G. Jeffrey, Boynton, William V., Dohm, James M., Finch, Mike J., Hamara, David K., Janes, Daniel M., Karunatillake, Suniti, Keller, John M., Kerry, Kristopher E., Metzger, Albert E., Williams, Remo M. S.

“…Quantifying secular variations in the chemical composition of the Martian crust provides unique insights into the processes that have guided the evolution of…”
Get full text

Aluminum abundance on the surface of Mercury: Application of a new background-reduction technique for the analysis of gamma-ray spectroscopy data by Peplowski, Patrick N., Rhodes, Edgar A., Hamara, David K., Lawrence, David J., Evans, Larry G., Nittler, Larry R., Solomon, Sean C.

“…A new technique has been developed for characterizing gamma‐ray emission from a planetary surface in the presence of large background signals generated in a…”
Get full text

Thermal and Evolved Gas Analyzer: Part of the Mars Volatile and Climate Surveyor integrated payload by Boynton, William V., Bailey, Samuel H., Hamara, David K., Williams, Michael S., Bode, Rolfe C., Fitzgibbon, Michael R., Ko, WenJeng, Ward, Michael G., Sridhar, K. R., Blanchard, Jeff A., Lorenz, Ralph D., May, Randy D., Paige, David A., Pathare, Asmin V., Kring, David A., Leshin, Laurie A., Ming, Douglas W., Zent, Aaron P., Golden, D. C., Kerry, Kristopher E., Lauer, H. Vern, Quinn, Richard C.

“…The Thermal and Evolved Gas Analyzer (TEGA) on the Mars Polar Lander spacecraft is composed of two separate components which are closely coupled: a…”
Get full text

Aluminum abundance on the surface of Mercury: Application of a new background-reduction technique for the analysis of gamma-ray spectroscopy data : MESSENGER Views Mercury From Orbit by PEPLOWSKI, Patrick N, RHODES, Edgar A, HAMARA, David K, LAWRENCE, David J, EVANS, Larry G, NITTLER, Larry R, SOLOMON, Sean C

Get full text

Major-element abundances on the surface of Mercury: Results from the MESSENGER Gamma-Ray Spectrometer : MESSENGER Views Mercury From Orbit by EVANS, Larry G, PEPLOWSKI, Patrick N, WEIDER, Shoshana Z, BOYNTON, William V, HAMARA, David K, GOLDSTEN, John O, RHODES, Edgar A, LAWRENCE, David J, MCCOY, Timothy J, NITTLER, Larry R, SOLOMON, Sean C, SPRAGUE, Ann L, STOCKSTILL-CAHILL, Karen R, STARR, Richard D

Get full text