From: IN%"KTOBISKA@gllsvc.jpl.nasa.gov" 24-APR-1997 21:10:46.48 To: IN%"SIMMONS@pisces.colorado.edu" CC: Subj: G7A UVS/EUV science summary Return-path: Received: from glvax0.jpl.nasa.gov by pisces.colorado.edu (PMDF V4.2-13 #12962) id <01II3J31XLXC9PLUTX@pisces.colorado.edu>; Thu, 24 Apr 1997 21:10:30 GMT Date: Thu, 24 Apr 1997 14:10:47 -0700 From: KTOBISKA@gllsvc.jpl.nasa.gov Subject: G7A UVS/EUV science summary To: SIMMONS@pisces.colorado.edu Message-id: <970424141047.21e026e8@gllsvc.jpl.nasa.gov> Content-transfer-encoding: 7BIT From: SMTP%"Stuart.Stephens@jpl.nasa.gov" 24-MAR-1997 15:40:28.62 To: KTOBISKA CC: Subj: G7 UVS/EUV OAP text X400-Received: by mta Proteus in /c=us/admd=telemail/prmd=nasa/; converted ( IA5-Text); Relayed; 24 Mar 1997 15:38:32 -0800 X400-Received: by /c=us/admd=telemail/prmd=nasa/; converted ( IA5-Text); Relayed; 24 Mar 1997 15:38:32 -0800 X400-MTS-Identifier: [/c=us/admd=telemail/prmd=nasa/; 007F033371078003-Proteus] Content-Identifier: 007F033371078003 Content-Return: Allowed X400-Content-Type: P2-1988 ( 22 ) Conversion: Allowed Original-Encoded-Information-Types: IA5-Text Priority: normal Disclose-Recipients: Prohibited Alternate-Recipient: Allowed X400-Originator: Stuart.Stephens@jpl.nasa.gov X400-Recipients: non-disclosure; Message-Id: <007F033371078003*/c=us/admd=telemail/prmd=nasa/o=jpl/ou=ccmail/s=Stephens/g=Stuart/@MHS> Date: 24 Mar 1997 15:38:32 -0800 From: Stuart Stephens To: Laura A Barnard (Return requested) cc: ktobiska@glvax0.jpl.nasa.gov (Return requested), jaiello@glvax0.jpl.nasa.gov (Return requested) Subject: G7 UVS/EUV OAP text MIME-Version: 1.0 UVS AWG: The top priority UVS Jupiter atmospheric observation during this orbit is a realtime far- and mid-ultraviolet (FUV/MUV: 115-320 nm) moderate solar phase angle (75 deg) brown barge feature track observation (FTKR1EXY). Analysis of the data will result in a unique data set of stratospheric aerosol scattering properties at a moderate solar phase angle and three emission angles performed in conjunction with other AWG instruments. Realtime data in the MUV will be retrieved from the observations immediately following the SSI frames. Additional UVS atmospheric observations will provide a realtime fixed local time map for northern and southern auroral FUV spectral coverage and precipitating electron energy (color ratio) measurements (FIXTMD01). This observation is slightly different from previous FIXTMD observations in that the UVS will drift at cone 90 deg from the darkside onto the dayside. This observation will benefit from a NIMS ridealong for looking at H3+ and from EUV realtime observations occurring during this time. Additional realtime coverage of the southern and northern auroral darkside and brightside asymmetries (AURMAP01) will occur immediately following FIXTMD01 and will benefit from SSI, NIMS, and EUV ridealongs. Analysis of the ratios between different spectral lines (color ratios) will yield energies of the electrons precipitating into the auroral zones. Global mapping of equatorial H Lyman-alpha on the darkside will continue as in previous orbits to obtain hydrogen distribution maps without the influence of direct solar radiation (DRKMAP01 and FIXLON01). Finally, a realtime equatorial brightside map (BRTMAP01) will occur to obtain the dayglow UV spectrum. UVS MWG: At the beginning of G7A, UVS will observe the Callisto and Ganymede orbit ansae (CTORUS02 and GTORUS02), continuing measurements begun in E6C and designed to search for neutral H and O emissions. The highest priority UVS magnetospheric observations during the G7 orbit will be those in conjunction with the EUV instrument for observations of the Io torus midnight ansa and Jupiter aurora. This set of realtime torus measurements (G7MANS01-03) will map the torus ansa simultaneously with the EUV in S and O ion emission lines using FUV and near-ultraviolet (NUV: ~400 nm) wavelengths. Ratios of emission line intensities will determine electron temperatures. A UVS-only midnight ansa profile will also be taken (G7MPRO01), using the scan platform to target at greater than 90 deg cone angle, while EUV continues to observe the colder portion of the inner torus. Realtime auroral measurements (G7AURA01-03) will map the aurora and electroglow simultaneously with the EUV in the FUV hydrogen bands. AURA03 is EUV-only, and occurs at the same time as UVS-AWG, NIMS, SSI, and HST observations of the aurora. Integrated intensities will characterize the global energy output and the latitudinal and time variation of energetic particle input into the atmosphere. Inside 23 Rj, the UVS alone will map the Io torus noon ansa (G7NANS02-03) in S and O ion emission lines. Again, a UVS- only noon ansa profile will also be taken (G7NPRO01). The noon and midnight ansa observations will help characterize the torus ansae as a function of longitude, time, and radial distance. During cruise, several UVS magnetonebula observations are planned. These observations are long-duration measurements of FUV neutral H and O emissions along the axis of the magnetonebula in the antisun direction. UVS SWG: UVS-SWG activities in G7 feature recorded observations of each of the Galilean satellites, mostly conducted as ridealongs with NIMS investigations. For Ganymede, there are HNLAT_01 (two scans across high northern latitudes) and BRITRL01 (bright material on the trailing hemisphere). The G7 orbit allows for another in the UVS instrument's series of limb observations, BRTLMB01. Following the trend established in E4, surface observations of Europa continue with the NIMS ride-alongs, FLEXUS01 and TYREMA01. One Callisto measurement is planned, a ridealong with the NIMS global observation, GLOBAL01. Three very short recorded observations of Io occur, CHEMIS01 and CHEMIS02 (Io dayside) and THRMAL02 (Io nightside). All of the recorded UVS measurements occur at FUV and MUV wavelengths, with the UVS G- and F- channels. Realtime data will be obtained during an eclipse of Europa (EECLPS01-04). This eclipse observation includes UVS N-channel sampling of Europa during mid- umbra (EURDRK01). Io also will be observed in realtime during mid-eclipse with the N-channel (IODARK01).