Physics
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11649g&link_type=abstract
HST Proposal ID #11649. Cycle 17
Physics
Scientific paper
The Io UV footprint {IFP} is an auroral emission on Jupiter consisting of one or more spots resulting from the electromagnetic interaction between Io and the Jovian magnetosphere. Recent UV HST observations of the Jovian aurora raised new issues and put previous interpretations under question. Dedicated STIS Time-tag observations based on only 3 HST orbits will help us to directly answer the following questions and test new hypothesis on the physics driving their associated phenomenon. The proposed observations will determine whether the previously observed short timescale { 2 min} variations of the IFP are periodic or burst events. If the {quasi-}periodicity is established, these constraints will help us to understand the origin of these variations. These observations will also clarify the conditions of occurrence of the unexpected quasi-simultaneous variations of the southern multiple spots of the IFP. Moreover, we propose to observe the emergence of the southern leading {or precursor} spot and the possible evolution of its brightness. These two elements might validate or exclude the recently proposed idea that cross-hemisphere electron beams or strong non-linearities of the electromagnetic interaction explain the presence of the leading and secondary spots.;
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