!  File:  3935C.PROP
!  Database:  PEPDB
!  Date:  20-FEB-1994:00:41:16

coverpage:

  title_1:         SULFUR NEAR IO
    title_2:       CYCLE 2
    sci_cat:       SOLAR SYSTEM
    proposal_for:  AUG/HRS
    cont_id:       1206
    pi_fname:      LAURENCE
    pi_mi:         M.
    pi_lname:      TRAFTON
    pi_inst:       TEXAS, UNIVERSITY OF
    pi_country:    USA
    pi_phone:      (512)471-1476
    keywords_1:    IO, SULFUR, JOVIAN TORUS
    hours_pri:     4.41
    num_pri:       3
    time_crit:     X
    pi_position:   L. TRAFTON, RESEARCH
! end of coverpage

abstract:

    line_1:        Neutral sulfur and oxygen, and stages of ionized sulfur have been observed in
    line_2:        Jupiter's torus. Io is supposed to be the source of all torus species but the
    line_3:        mechanism feeding the torus has not been determined. Neutral S should be
    line_4:        densest   Io. We will attempt to detect neutral sulfur and oxygen near Io in and
    line_5:        out of the plasma torus in order to shed light on this problem.

!
! end of abstract

general_form_proposers:

  lname:           TRAFTON
    fname:         LAURENCE
    mi:            M.
    inst:          TEXAS, UNIVERSITY OF
    country:       USA

!
! end of general_form_proposers block

general_form_text:

  question:        3
    section:       1
    line_1:        Use J.P.L. ephemeric to set up on Io. Use HRS target acquisition mode to
    line_2:        center on Io. Observe S1296/1479A/1817A; and O1300/1356A near Io through LSA
    line_3:        with low resolution grating when Io's geocentric orbital phase
    line_4:        angle is between 45D and 90D . Observe when Io is within 2D and beyond
    line_5:        5D of the plasma torus equator.
    line_6:        Next, offset 2.5 arcsec from Io towards Jupiter and observe  when Io's
    line_7:        orbital elongation is within 45D - 90D for the same two plasma torus
    line_8:        proximities. Obtain one exposure
    line_9:        with Jupiter in the background to attempt detection of 1820/1900A
    line_10:       absorption; when plasma torus is out of the way (30 min.). Track +/- 1 arcsec
    line_11:       wrt Io. Obtain
    line_12:       calibration of Jupiter (10 m) center of disk.
    line_13:       Obtain EARTH-CALIB.

!

  question:        4
    section:       1
    line_1:        UV required
    line_2:        spatial resolution required

!

  question:        5
    section:       1
    line_1:        Need to observe Io when Jupiter is not nearby and both when Jupiter's magnetic
    line_2:        equator is near and not near Io.
    line_3:        Determine whether ionization by the plasma torus (in the magnetic equator)
    line_4:        either depletes the S near Io or else enhances its emission.

!

  question:        7
    section:       1
    line_1:        Preliminary reduction of STScI
    line_3:        Final reductions and analysis at U. TX using
    line_4:        Sun 4 Sparkstation.

!

  question:        8
    section:       1
    line_1:        Neutral sulfur and oxygen emissions near Io will be observed to provide
    line_2:        information on the source mechanism feeding the plasma torus.

!

  question:        10
    section:       1
    line_1:        VAX 11/780; Sun 4.

!
!end of general form text

general_form_address:

  lname:           TRAFTON
    fname:         LAURENCE
    mi:            M.
    category:      PI
    inst:          UNIVERSITY OF TEXAS AT AUSTIN
    addr_1:        RLM 16.342
    city:          AUSTIN
    state:         TX
    zip:           78712
    country:       USA

!
! end of general_form_address records

! No fixed target records found

solar_system_targets:

  targnum:         1
    name_1:        IO-OUT
    descr_1:       SATELLITE IO
    lev1_1:        STD = JUPITER
    lev2_1:        STD = IO
    wind_1:        OLG OF IO BETWEEN 45 110,
    wind_2:        CML OF JUPITER FROM IO BETWEEN 160 245,
    wind_3:        SEP OF EUROPA IO FROM EARTH GT 12",
    wind_4:        SEP OF GANYMEDE IO FROM EARTH GT 12",
    wind_5:        SEP OF CALLISTO IO FROM EARTH GT 12",
    wind_6:        WND1 = 01-DEC-92 TO 15-MAR-93
    comment_1:     OBSERVE IO NEAR EASTERN ELONGATION
    comment_2:     WITHIN 75% OF MAX. MAGNETIC LATITUDE.
    comment_3:     CML OF JUPITER IO FROM 340 TO 65
    comment_4:     IS ALSO ACCEPTABLE.
    comment_5:     OBSERVED EAST OF JUP. BEFORE OPP.
    comment_6:     TO INCREASE DOPPLER OF OXYGEN.
    fluxnum_1:     1
    fluxval_1:     V=5

!
! end of solar system targets

! No generic target records found

exposure_logsheet:

    linenum:       1.000
    targname:      IO-OUT
    config:        HRS
    opmode:        ACQ
    aperture:      2.0
    sp_element:    MIRROR-N2
    num_exp:       1
    time_per_exp:  1.8S
    fluxnum_1:     1
    priority:      1
    param_1:       BRIGHT=RETURN,
    param_2:       LOCATE=YES,
    param_3:       SEARCH-SIZE=3
    req_1:         ONBOARD ACQ FOR 1.2;
    req_2:         CYCLE 2/1-3.5;
    req_3:         SEQ 1-3.5 NO GAP
    comment_1:     DESIRE RETURN TO BRIGHTEST
    comment_2:     POINT.
    comment_3:     OK TO VIOLATE OLG&CML WINDOWS FOR
    comment_4:     LINES 1-1.2 TO FACILITATE SCHEDULING.

!

    linenum:       1.200
    targname:      IO-OUT
    config:        HRS
    opmode:        IMAGE
    aperture:      2.0
    sp_element:    MIRROR-N2
    num_exp:       1
    time_per_exp:  97S
    fluxnum_1:     1
    priority:      1
    comment_1:     TAKE MAP AFTER CENTERING

!

    linenum:       3.100
    targname:      IO-OUT
    config:        HRS
    opmode:        WSCAN
    aperture:      2.0
    sp_element:    G160M
    wavelength:    1288-1368
    num_exp:       1
    time_per_exp:  43M
    priority:      1
    param_2:       WAVE-STEP=40
    comment_1:     OK TO TWEAK EXPOSURES TO
    comment_2:     MEET THIS REQUIREMENT.

!

    linenum:       3.500
    targname:      IO-OUT
    config:        HRS
    opmode:        ACCUM
    aperture:      2.0
    sp_element:    G160M
    wavelength:    1479
    num_exp:       1
    time_per_exp:  22M
    priority:      1

!
! end of exposure logsheet

! No scan data records found