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- Publications
- Influence
The Far-Ultraviolet Oxygen Airglow of Europa and Ganymede
- D. Hall, P. Feldman, M. Mcgrath, D. Strobel
- Physics
- 20 May 1998
Far-UV spectra of Europa and Ganymede, acquired by the Hubble Space Telescope Goddard High Resolution Spectrograph, indicate that, in addition to faintly reflected sunlight, both satellites emit O I… Expand
Detection of an oxygen atmosphere on Jupiter's moon Europa
- D. Hall, D. Strobel, P. Feldman, M. McGrath, H. Weaver
- Physics, Medicine
- Nature
- 23 February 1995
EUROPA, the second large satellite out from Jupiter, is roughly the size of Earth's Moon, but unlike the Moon, it has water ice on its surface1. There have been suggestions that an oxygen atmosphere… Expand
Detection of the hydroxyl radical in the Saturn magnetosphere
- D. Shemansky, P. Matheson, D. Hall, H. Hu, T. Tripp
- Chemistry
- Nature
- 27 May 1993
THE magnetosphere in the vicinity of the orbits of Saturn's icy satellites consists of a low-density plasma, in which the electrons are an order of magnitude cooler than the accompanying heavy ions1.… Expand
The distribution of atomic hydrogen in the magnetosphere of Saturn
- D. Shemansky, D. Hall
- Physics
- 1 April 1992
Three sets of previously unpublished Voyager ultraviolet spectrometer (UVS) observations in H Ly α emission reveal a complex three-dimensional distribution of atomic hydrogen in the Saturn system.… Expand
Ultraviolet Spectrometer Observations of Neptune and Triton
- A. L. Broadfoot, S. Atreya, +19 authors R. Yelle
- Physics, Medicine
- Science
- 15 December 1989
Results from the occultation of the sun by Neptune imply a temperature of 750 � 150 kelvins in the upper levels of the atmosphere (composed mostly of atomic and molecular hydrogen) and define the… Expand
LEGEND - a three-dimensional LEO-to-GEO debris evolutionary model
Abstract A new orbital debris evolutionary model is being developed by the NASA Orbital Debris Program Office at Johnson Space Center. LEGEND, a LEO-to-GEO Environment Debris model, is capable of… Expand
An Analysis of 17 Years of Voyager Observations of the Diffuse Far-Ultraviolet Radiation Field
- J. Murthy, D. Hall, M. Earl, R. Henry, J. B. Holberg
- Physics
- 10 September 1999
We have systematically reduced 17 years of data from the Voyager ultraviolet spectrometer (UVS) archives, from which we have obtained 431 spectra that place useful limits on the diffuse… Expand
The recent expansion of Pluto's atmosphere
- J. L. Elliot, A. Ateş, +26 authors L. H. Wasserman
- Physics, Medicine
- Nature
- 10 July 2003
Stellar occultations—the passing of a relatively nearby body in front of a background star—can be used to probe the atmosphere of the closer body with a spatial resolution of a few kilometres (ref.… Expand
Interaction of the solar wind with the local interstellar medium: A multifluid approach
- G. Zank, H. Pauls, L. L. Williams, D. Hall
- Physics
- 1 October 1996
A distinct fluid description for neutral hydrogen originating from either the interstellar medium, the heliosheath, or the solar wind has been developed to describe the detailed interaction of the… Expand