!  File:  4877C.PROP
!  Database:  PEPDB
!  Date:  23-FEB-1994:07:30:30

coverpage:

  title_1:         GEOCORONAL LY-ALPHA PROFILE:CYCLE 3,MED
    sci_cat:       SOLAR SYSTEM
    sci_subcat:    GIANT PLANETS
    proposal_for:  SNAP
    cont_id:       1203
    pi_fname:      LAURENCE
    pi_mi:         M.
    pi_lname:      TRAFTON
    pi_inst:       TEXAS, UNIVERSITY OF
    pi_country:    USA
    pi_phone:      (512)471-1476
    keywords_1:    LY-ALPHA, AURORA, MAGNETOSPHERE
    hours_pri:     4.50
    num_pri:       1
    pi_position:   RESEARCH SCIENTIST
! end of coverpage

abstract:

    line_1:        Observe the geocoronal Ly-alpha profile along the night ecliptic in
    line_2:        orbital segments for later editing to match background Ly-alpha profile
    line_3:        of Jupiter for program 4175. This will be used for subtracting out the
    line_4:        background of the Jupiter observation, for which the geocoronal line
    line_5:        blends the planetary Ly-alpha line. An accurate profile is needed to yield
    line_6:        an accurate planetary line profile. High S/N is required.
    line_7:        This observation will also help in the detection of D on Jupiter.

!
! 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:        Point blindly on gyros to the vicinity of Jupiter's orbit when the schedule
    line_2:        permits and obtain spectra with G160M for both the LSA and SSA of the
    line_3:        geocoronal Ly-alpha emission. Readout the data every 5-10 min. Observe
    line_4:        at local night in order to assure matching the observing conditions for
    line_5:        the associated Jupiter observations (P4175), particularly the distribution
    line_6:        of illuminated H atoms along the line of sight.

!

  question:        4
    section:       1
    line_1:        1216A required.
    line_2:        Precisely the same resolution and instrumental setup  required as for the
    line_3:        associated Jupiter HST program 4175.

!

  question:        5
    section:       1
    line_1:

!

  question:        6
    section:       1
    line_1:        Dark time geocoronal spectrum needed to remove blended Ly-alpha background
    line_2:        emission from accompanying program 4175 observations of Jupiter Ly-alpha.
    line_3:        Same instrumental setup and approximately the same HST pointing close to
    line_4:        Jupiter's orbit required to insure bracketting the same distribution of
    line_5:        sunlight illuminating the H along the line of sight.

!

  question:        7
    section:       1
    line_1:        Reductions and analysis at U. TX using VAX 11/780 cluster

!

  question:        8
    section:       1
    line_1:        Request these  geocoronal  observations to be SNAP at no charge because
    line_2:        these were originally requested as PARALLEL observations with
    line_3:        Jupiter and Io (P1203 and 1204) but HST still has not implemented the
    line_4:        capability of parallel observations using the GHRS.

!

  question:        10
    section:       1
    line_1:        VAX 11/780
    line_2:        Sun Sparcstation

!
!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 16.326
    city:          AUSTIN
    state:         TX
    zip:           78712
    country:       USA
    phone:         (512)471-1476

!
! end of general_form_address records

! No fixed target records found

! No solar system records found

generic_targets:

  targnum_1:       1
    name_1:        GEOCORONA-CALIB
    descr_1:       NIGHT GEOCORONAL LY-ALPHA PROFILE
    descr_2:       NEAR ECLIPTIC PLANE.
    criteria_1:    BETA = -3D+/-3D
    criteria_2:    LAMBDA= 180D+/-180D
    comment_1:     NEED FOR INSTRUMENTAL PROFILE
    comment_2:     OF HRS TO SUBTRACT BACKGROUND
    comment_3:     LY-ALPHA FROM PLANETARY
    comment_4:     LY-ALPHA EMISSION. [ABS CALIB
    comment_5:     IS NOT REQUIRED HERE.]
    fluxnum_1:     1
    fluxval_1:     SURF(1216)=1.6E-6
    fluxnum_2:     2
    fluxval_2:     W-LINE(1216)=0.01

!
! end of generic targets

exposure_logsheet:

    linenum:       1.000
    targname:      GEOCORONA-CALIB
    config:        HRS
    opmode:        ACCUM
    aperture:      2.0
    sp_element:    G160M
    wavelength:    1208.00
    num_exp:       15
    time_per_exp:  6M
    fluxnum_1:     1
    fluxnum_2:     2
    priority:      1
    param_1:       STEP-TIME=1.0
    req_1:         DARK TIME;
    req_2:         CYCLE 3 / 1-2;
    req_3:         GUID TOL 2D / 1-2
    comment_1:     ALL GEOCORONAL OBSERVATIONS
    comment_2:     REQUIRE LINE-OF-SIGHT DOPPLER
    comment_3:     CORRECTION FOR HST'S MOTION.
    comment_4:     CALIBRATION FOR LINE 2 OF 4175
    comment_5:     AND LINE 5 OF 1204. REQUIRE
    comment_6:     SEVERAL NIGHT-ORBITS TO BUILD S/N.

!

    linenum:       2.000
    targname:      GEOCORONA-CALIB
    config:        HRS
    opmode:        ACCUM
    aperture:      0.25
    sp_element:    G160M
    wavelength:    1208.00
    num_exp:       30
    time_per_exp:  6M
    fluxnum_1:     1
    fluxnum_2:     2
    priority:      1
    param_1:       STEP-TIME=1.0
    req_1:         DARK TIME
    comment_1:     CALIBRATION FOR LINE 4 OF 4175.
    comment_2:     BOTH OBS SHOULD SPAN FULL S/C NIGHT.
    comment_3:     OK TO BREAK UP OBSERVATION.
    comment_4:     FREQUENT RO'S PERMIT EDITING TO
    comment_5:     MATCH JUPITER AND IO OBSERVATIONS.

!
! end of exposure logsheet

! No scan data records found