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Browsing by Author "Hamara, David K."

Browsing by Author "Hamara, David K."

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  • Analysis of MESSENGER Gamma-Ray Spectrometer data from the Mercury flybys 
    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. (2011)
    [alpha]bstract<br/>During its three flybys of Mercury, the MESSENGER spacecraft made the first detection of gamma-ray emission from the planet&#39;s surface. With a closest approach distance of ~200 km, the flybys provided ...
  • Major-element abundances on the surface of Mercury: Results from the MESSENGER Gamma-Ray Spectrometer 
    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. (2012)
    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 on the surface of Mercury. The Si abundance was determined and ...
  • The Major-Element Composition of Mercury s Surface from MESSENGER X-ray Spectrometry 
    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. (2011)
    X-ray fluorescence spectra obtained by the MESSENGER spacecraft orbiting Mercury indicate that the planet s surface differs in composition from those of other terrestrial planets. Relatively high Mg/Si and low Al/Si and ...
  • Radioactive Elements on Mercury s Surface from MESSENGER: Implications for the Planet s Formation and Evolution 
    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. (2011)
    The MESSENGER Gamma-Ray Spectrometer measured the average surface abundances of the radioactive elements potassium (K, 1150 ± 220 parts per million), thorium (Th, 220 ± 60 parts per billion), and uranium (U, 90 ± 20 parts ...

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