Engineering topics

Shirley, J. H.

Publications and source records attributed to Shirley, J. H..

6 records

NASA NTRS2011

Interannual Variability of Dust and Ice in the Mars Atmosphere: Comparison of MRO Mars Climate Sounder Retrievals with MGS-TES Limb Sounding Retrievals

Dust and ice play important roles in Martian atmospheric dynamics on all time scales. Dust loading in particular exerts an important control on atmospheric temperatures and thereby on the strength of the atmospheric circulation in any given year. We present the first comparisons of MGS-TES aerosol opacity profiles with MRO-MCS aerosol opacity profiles. While the differences in vertical resolution are significant (a factor of 2), we find good agreement at particular seasons between nightside zonal average dust opacity profiles from the two instruments. Derived water ice opacities are likewise similar but show greater variability.

Mars Climate Sounder (MCS)↗

NASA NTRS2003

Icy satellites impactor probes for the Jovian Icy Moons Orbiter

UNKNOWN

probe↗

NASA NTRS2003

Icy Satellites Impactor Probes for the Jovian Icy Moons Orbiter

We present a preliminary design and mission description for Icy Satellites Impactor Probes (IPS). This design addresses two of the scientific themes of this Icy Galilean Satellites Forum: Surface Chemistry and Geophysics, and Interior Structures. Impactor probes may also make significant contributions in the areas of surface geology and mineralogy.

Shirley, J. H.↗

NASA NTRS2001

Radiolytic influence on the surface composition of the Galilean satellites

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Jupiter satellites composition↗

NASA NTRS2001

Europa surface geology: expanded stratigraphic unit descriptions derived from collaborative analysis of Galileo NIMS and SSI observations from E14

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Europa Galilean satellites planetary geology↗

NASA NTRS1999

Hydrogen peroxide on the surface of Europa

Spatially resolved infrared and ultraviolet wavelength spectra of Europa's leading, anti-jovian quadrant observed from the Galileo spacecraft show absorption features resulting from hydrogen peroxide. Comparisons with laboratory measurements indicate surface hydrogen peroxide concentrations of about 0.13 percent, by number, relative to water ice. The inferred abundance is consistent with radiolytic production of hydrogen peroxide by intense energetic particle bombardment and demonstrates that Europa's surface chemistry is dominated by radiolysis.

Non-programmatic↗