Physics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5440p&link_type=abstract
HST Proposal ID #5440
Physics
Hst Proposal Id #5440 Solar System
Scientific paper
Our primary interest is the spectral profile of the Lyman alpha line at high andlow spectral resolution, in several characteristic regions of the north Jovianaurora, together with the H2 Lyman and Werner spectrum important for itsinterpretation. The Lyman alpha line at high resolution, aimed to diagnose theauroral atmosphere ([H], T profile) and the precipitating particle properties(energy, species, superthermal proton outflows) will be obtained with the GHRSEchelle A, and LSA because of the low sensitivity . The search for extendedred shifted Lyman alpha wing , typical of proton precipitation, will be performedat medium (subA) resolution with GHRS/SSA and low resolution with GHRS/LSA. The useof SSA insures the spectral and spatial resolution (arcs may be as narrow as 0.1"),but with a low count-rate. By contrast use of GHRS/LSA will provide a a reasonablecount-rate at the expense of resolution. This will provide for free the H2spectrum required to fully interpret the information in the Lyman alpha data throughour models.The features investigated here are signatures of specific auroral processes, andthey are not expected to be present in the whole auroral region. Consequently, wewill target with particular care a few specific areas:(1) the narrow high latitude arc at longitudes both sides of 150 deg. (~120 and200 on L~30) (2) the diffuse spot centered on 150-160 deg. In the spot extendingnorth and south of L~30, the processes may be different in the polar and lowlatitude areas, so that
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