From: IN%"kent.tobiska@jpl.nasa.gov" "W. Kent Tobiska" 4-NOV-1999 19:52:49.56 To: IN%"Kathryn.A.Schimmels@jpl.nasa.gov" "Kathryn Schimmels" CC: IN%"kent.tobiska@jpl.nasa.gov", IN%"stewart@pisces.colorado.edu" "Ian A.F. Stewart", IN%"pryor@pisces.colorado.edu" "Wayne Pryor", IN%"hendrix@pisces.colorado.edu" "Amanda Hendrix" Subj: UVS/EUV I25 science objectives Return-path: Received: from lasp.Colorado.EDU by pisces.colorado.edu (PMDF V4.2-13 #U4006) id <01JHY9MLQHPSB7AOY9@pisces.colorado.edu>; Thu, 4 Nov 1999 19:52:35 GMT Received: from eis-msg-014.jpl.nasa.gov (eis-msg-014.jpl.nasa.gov [137.78.160.158]) by lasp.colorado.edu (8.9.3+Sun/8.9.1) with ESMTP id MAA15830; Thu, 4 Nov 1999 12:51:12 -0700 (MST) Received: from [137.78.240.26] ([137.78.240.26]) by eis-msg-014.jpl.nasa.gov (8.9.3/8.9.3) with ESMTP id LAA16971; Thu, 4 Nov 1999 11:51:33 -0800 (PST) Date: Thu, 04 Nov 1999 11:55:29 -0700 From: "W. Kent Tobiska" Subject: UVS/EUV I25 science objectives In-reply-to: <3.0.32.19991104110016.00b47b78@pop.jpl.nasa.gov> To: Kathryn Schimmels Cc: kent.tobiska@jpl.nasa.gov, "Ian A.F. Stewart" , Wayne Pryor , Amanda Hendrix , Lisa Crowell: ;, Karen Simmons: ; Message-id: MIME-version: 1.0 Content-type: text/plain; charset="us-ascii" Content-transfer-encoding: 7BIT X-Sender: ktobiska@pop.jpl.nasa.gov X-Priority: 1 (Highest) In orbit I25, the UVS and EUV concentrate upon Io science related to studies of: - satellite surface properties (25IUSURFAC01, 25IUSURFAC02, 25EUNPOLE_01, 25EUSUBJUP01, 25EUEQUATR01, and 25EUGLOBAL01); - satellite atmosphere characterization (25IUATMOS_01 and 25IUATMOS_02); - satellite aurora (25IUECLIPS01); and - Io torus morphology (25TV24NANS01, 25TU25NANS01, and 25TU25NANS02). The six (6) satellite surface property observations are primarily full spectral studies in the FUV to MUV 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). Included in these are four (4) observations of Europa by the UVS instrument (25EUNPOLE_01, 25EUSUBJUP01, 25EUEQUATR01, 25EUGLOBAL01) which are ridealong studies with the NIMS instrument using full spectrum MUV data to continue studies of unique surface features, their scattering properties, surface composition, and formation processes. The two (2) satellite atmosphere characterization studies also use full spectral scans in the FUV and MUV to observe Io atmospheric hydrogen, sulphur, and oxygen as it is released to space. The one eclipse observation attempts to observe aurora on Io and will be compared to previous SSI images of Io in eclipse. In particular, the removal of scattered sunlight for these FUV-MUV-NUV observations will potentially reveal new information about Jupiter's magnetospheric and energetic interactions with the Io atmosphere and surface. The three (3) 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 **************************