From: IN%"kent.tobiska@jpl.nasa.gov" "W. Kent Tobiska" 21-SEP-1999 02:08:18.83 To: IN%"lisa.c.crowell@jpl.nasa.gov" "Lisa Crowell" CC: IN%"kent.tobiska@jpl.nasa.gov", IN%"hendrix@pisces.colorado.edu" "Amanda Hendrix", IN%"stewart@pisces.colorado.edu" "Ian A.F. Stewart", IN%"pryor@pisces.colorado.edu" "Wayne Pryor" Subj: I24 science objectives Return-path: Received: from cardinal.prod.itd.earthlink.net by pisces.colorado.edu (PMDF V4.2-13 #U4006) id <01JG7RMBLHJK9I45CV@pisces.colorado.edu>; Tue, 21 Sep 1999 02:07:55 GMT Received: from [63.15.173.112] (1Cust112.tnt9.melbourne.fl.da.uu.net [63.15.173.112]) by cardinal.prod.itd.earthlink.net (8.9.3/8.9.3) with ESMTP id TAA19037; Mon, 20 Sep 1999 19:07:56 -0700 (PDT) Date: Mon, 20 Sep 1999 18:11:09 -0700 From: "W. Kent Tobiska" Subject: I24 science objectives To: Lisa Crowell Cc: kent.tobiska@jpl.nasa.gov, Karen Simmons: ;, Amanda Hendrix , "Ian A.F. Stewart" , Wayne Pryor Message-id: MIME-version: 1.0 Content-type: text/plain; charset="us-ascii" Content-transfer-encoding: 7BIT X-Sender: ktobiska@pop.jpl.nasa.gov Orbit I24 enables the UVS and EUV to concentrate upon Io science related to studies of: - satellite surface properties (24IUSURFAC01, 24IUSURFAC02, 24IUSURFAC03): full spectral studies in the FUV to observe species absorption and excitation processes as well as scattering properties of the surface. These studies will complement previous work in the prime and GEM missions and will be studied in the context of other instruments observations (NIMS, SSI, and PPR). - satellite atmosphere characterization (24IUATMOS_01, 24IUATMOS_02): use full spectral scans in the MUV to observe Io atmospheric hydrogen, sulphur, and oxygen as it is released to space. - satellite aurora (24IUECLIPS01): made when Io is in eclipse and, where possible, will be compared to SSI images of Io in eclipse. In particular, the removal of scattered sunlight for these NUV observations will potentially reveal new information about Jupiter's magnetospheric and energetic interactions with the Io atmosphere and surface. - Io torus morphology (24TV24NANS01, 24TU24NANS01, 24TU24NANS02): Io torus observations with the EUV and UVS continue the morphological study of the Io torus and provide the basis for a long term comparison between prime mission and GMM datasets over 4 years as well as asymmetries between dawn (prime mission) and dusk (GMM) torus ansae. ************************** W. Kent Tobiska FDC/JPL, MS 264-580 4800 Oak Grove Dr. Pasadena, CA 91109 (818) 393-7742 (phone) (818) 393-4530 (fax) kent.tobiska@jpl.nasa.gov http://www.spacenvironment.net **************************