Other
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4608g&link_type=abstract
HST Proposal ID #4608
Other
Hst Proposal Id #4608
Scientific paper
Previous HST observations made with the FOC have demonstrated the ability of the HST to provide high spatial resolution images of the ultraviolet jovian aurora. They and other IUE and Voyager UVS observations suggest that wavelength dependence and time variations occur with different characteristic times. We propose to image the ultraviolet jovian aurora in several passbands to investigate its temporal variation on timescales ranging from ~10 min to hours. Exposures will be made when the 180 deg (Lambda III) longitude sector, where the aurora is best visible from Earth orbit, faces the Earth. Due to the expected loss of sensitivity in the far UV, this program should be preformed before the COSTAR correction. Coordinated IR measurements of emission connected to the UV aurora but originating from different altitude regions will be obtained in parallel with HST observations. Simultaneous radio observations of decametric jovian emissions and IUE UV spectra will also provide complementary data on energetic particle precipitation. The observed morphology, color ratio and characteristic time of the temporal variations will provide key information to discriminate between the various origins , identity and acceleration mechanisms of the precipitating particles. Theoretical models of particle interaction with the jovian magnetic field and atmosphere available from the proposing team will be used to derive quantitative information on these processes.
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