Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8353r&link_type=abstract
HST Proposal ID #8353
Physics
Hst Proposal Id #8353 Solar System
Scientific paper
The discovery of OH changed our view of Saturn's magnetosphere from one where plasma dominated the physics to one where neutrals are dominant. Four different sets of Hubble/FOS observations map the OH emission; published results from two data sets detected OH near the rings at 2 R_S and near the icy moons at 4.5 R_S. These are line of sight observations which determine the OH column density; more information is necessary to convert from column density to number density. We propose to combine all four data sets to reconstruct the OH density distribution. The data encompass 14 different lines of sight at 4 different look angles. The full data set provides much stronger constraints on both the radial and latitudinal distribution of OH than does the published data. Building on past work, we will model the physics and chemistry governing the neutral and plasma densities in Saturn's magnetosphere, and constrain the neutral and plasma distributions observed by HST, Voyager 1, and Voyager 2 to be consistent with our model results. The result of this work will be a 2-D picture of the OH densities in the Saturn magnetosphere, knowledge which is crucial for understanding neutral and plasma sources. Our results will also provide a set of predictions and tools for the Cassini mission experiments, as well as the context for linking data from the Voyager missions, HST observations and the Cassini mission.
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