5757( 31) - 11/13/96 10:14 - [ 0] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5757 Version: 31 Check-in Date: 13-Nov-1996 10:09:22 1.Proposal Title: DAYGLOW EMISSION LINE PROFILES FROM THE OUTER PLANETS CYCLE 4-MED PART 2 OF 5414 ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle SOLAR SYSTEM GO 4 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: JOHN T. CLARKE UNIVERSITY OF MICHIGAN CoI: Lotfi Ben Jaffel Institut d'Astrophysique de Paris N CoI: Randall Gladstone Southwest Research Institute N CoI: Renee Prange Institut d'Astrophysique Spatiale N CoI: Alfred Vidal-Madjar Institut d'Astrophysique de Paris N CoI: Hunter Waite Southwest Research Institute N ------------------------------------------------------------------------------------ 6. Abstract Recent IUE observations of the H Ly alpha emission line profile from Jupiter's dayglow and aurora reveal a substantial line broadening, implying that the observed high brightness is due to resonant scattering of solar emission with a broad line rather than charged particle excitation. This may reflect highly energetic processes producing a 5-10 km/sec suprathermal population of H atoms in Jupiter's upper atmosphere, which in turn may be related to the unresolved question of the high exospheric temperatures of 400-1200 K detected on all 4 giant planets during the Voyager encounters. It is clear that if the bright H Ly alpha emissions from the outer planets are due mainly to resonant scattering of solar and interplanetary emissions, as observed on Jupiter and Saturn from long term correlations with the solar Ly alpha flux, then the lines from all 4 planets must be broad to explain the observed high albedos. The H Ly alpha lineshapes provide a discriminant between the processes of resonant scattering and charged particle excitation. We propose to obtain high signal to noise H Ly alpha line profile measurements from Saturn, Uranus, and Neptune to resolve the questions about the excitation processes for the bright airglow emissions. SATURN PART ONLY - NEPTUNE AND URANUS IN ORIGIAL PROP (5414). ------------------------------------------------------------------------------------ Observations Description ------------------------ This is a repeat of failed observations, with only the Saturn portion of the original program GO 5414 being repeated. This will consist of GHRS Ech-A Ly alpha line profile spectra at 3 locations on Saturn and one on sky background. The three locations on Saturn are: 1) CML at 30 deg. south, 2) south auroral area, looking at south pole (in summer 1996 with equatorial plane tilted slightly to the north we have a better look at the south polar region than the north), and 3) sunlit limb at 30 deg. south, and same angle from limb as auroral pointing (note that sunlit limb reverses after opposition - pointing MUST be on sunlit limb). Observations are specified to include wavelength calibration spectra at same grating tilt as Saturn spectra for absolute wavelength calibration, i.e. SPY-BAL = NO between these observations. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 5757( 31) - 11/13/96 10:14 - [ 1] TARGET LIST b)Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 11 | TARGET NAME: SATURN-EQ ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: PLANET SATURN ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD=SATURN | TYPE=TORUS,LONG=0,LAT=- | 30,RAD=60268,POLE_LAT=+90 | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | OLG OF SATURN BETWEEN 300 330, OLG OF | SATURN BETWEEN 30 60 | ------------------------------------------------------------------------------------------------------------------------------------ DATA | COMMENTS | SURF(V) = 7.0 | GHRS ECH-A SPECTRUM OF H LY ALPHA SURF-LINE(1216.0)=30.0+/-10.0e-13 | LINE. SATURN OLG = 300-330 OR 30- 60 | DEG. POINT 30 DEGREES SOUTH OF | SATURN EQUATOR WITH GHRS LSA. | ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 12 | TARGET NAME: SATURN-S-POLE ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: PLANET SATURN ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD=SATURN | TYPE=TORUS,LONG=0,LAT=- | 80,RAD=53781,POLE_LAT=+90 | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | OLG OF SATURN BETWEEN 300 330, OLG OF | SATURN BETWEEN 30 60 | ------------------------------------------------------------------------------------------------------------------------------------ DATA | COMMENTS | SURF(V) = 7.0 | GHRS ECH-A SPECTRUM OF H LY ALPHA SURF-LINE(1216.0)=30.0+/-10.0e-13 | LINE. SATURN OLG = 300-330 OR 30- 60 | DEG. POINT 80 DEGREES SOUTH OF | SATURN EQUATOR WITH LSA. | ------------------------------------------------------------------------------------------------------------------------------------ 5757( 31) - 11/13/96 10:14 - [ 2] TARGET LIST b)Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 13 | TARGET NAME: SATURN-SUNLIT-LIMB ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: PLANET SATURN ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD=SATURN | TYPE=TORUS,LONG=290,LAT=- | 30,RAD=60268,POLE_LAT=+90 | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | OLG OF SATURN BETWEEN 300 330, OLG OF | SATURN BETWEEN 30 60 | ------------------------------------------------------------------------------------------------------------------------------------ DATA | COMMENTS | SURF(V) = 7.0 | GHRS ECH-A SPECTRUM OF H LY ALPHA SURF-LINE(1216.0)=30.0+/-10.0e-13 | LINE. SATURN OLG = 300-330 OR 30- 60 | DEG. OBSERVER 70 DEGREES WEST OF | SATURN CENTER WITH LSA. NOTE: "WEST" | ASSUMES POST-OPPOSITION MUST POINT | AT SUNLIT LIMB, WHICH IS WEST OF | CENTER POST-OPPOSITION | ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 14 | TARGET NAME: SATURN-OFFSET-SKY ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: OFFSET SATURN ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD=SATURN | TYPE=POS_ANGLE,RAD=120,ANG=0.0,REF=NORTH | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | ------------------------------------------------------------------------------------------------------------------------------------ DATA | COMMENTS | SURF-LINE(1216)=1.+/-1.e-11 | GHRS LSA WITH ECH-A ON SKY 2 ARC MIN W-LINE(1216)=0.10+/-0.1 | FROM SATURN. OBSERVE H LY ALPHA LINE | PROFILE FROM SKY BACKGROUND GEO AND | IPM EMISSIONS. | ------------------------------------------------------------------------------------------------------------------------------------ 5757( 31) - 11/13/96 10:14 - [ 3] Visit: 11 Visit Requirements: PCS MODE F On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 SATURN-EQ HRS ACCUM 2.0 ECH-A 1217.0 STEP-PATT=9,STEP-TIME=1.0, 3 272 S DOPPLER=DEF,FP-SPLIT = NO Comments: GHRS ECH-A LSA SPECTRUM OF SATURN -30 DEG. LATITUDE ON CML ------------------------------------------------------------------------------------------------------------------------------------ 11 SATURN-EQ HRS ACCUM 2.0 ECH-A 1217.0 STEP-PATT=9,STEP-TIME=1.0, 6 136 S SEQ 11-13 NON-INT DOPPLER=DEF,FP-SPLIT = NO Comments: GHRS ECH-A LSA SPECTRUM OF SATURN -30 DEG. LATITUDE ON CML ------------------------------------------------------------------------------------------------------------------------------------ 13 WAVE HRS ACCUM SC2 ECH-A 1217.0 STEP-PATT=9,STEP-TIME=1.0, 1 2 M DOPPLER=DEF,SPYBAL = NO Comments: WAVELENGTH CALIBRATION FOR 10-11: NO SPYBAL SHOULD OCCUR BETWEEN LINES 11 - 13 ------------------------------------------------------------------------------------------------------------------------------------ 19 SATURN-S-PO HRS ACCUM 2.0 ECH-A 1217.0 STEP-PATT=9,STEP-TIME=1.0, 3 272 S LE DOPPLER=DEF,FP-SPLIT = NO Comments: GHRS ECH-A LSA SPECTRUM OF SATURN SOUTH POLE AND AURORA ------------------------------------------------------------------------------------------------------------------------------------ 21 SATURN-S-PO HRS ACCUM 2.0 ECH-A 1217.0 STEP-PATT=9,STEP-TIME=1.0, 7 136 S SEQ 21-23 NON-INT LE DOPPLER=DEF,FP-SPLIT = NO Comments: GHRS ECH-A LSA SPECTRUM OF SATURN SOUTH POLE AND AURORA ------------------------------------------------------------------------------------------------------------------------------------ 23 WAVE HRS ACCUM SC2 ECH-A 1217.0 STEP-PATT=9,STEP-TIME=1.0, 1 2 M DOPPLER=DEF,SPYBAL = NO Comments: WAVELENGTH CALIBRATION FOR 19-21: NO SPYBAL SHOULD OCCUR BETWEEN LINES 21 - 23 ------------------------------------------------------------------------------------------------------------------------------------ 29 SATURN-SUNL HRS ACCUM 2.0 ECH-A 1217.0 STEP-PATT=9,STEP-TIME=1.0, 3 272 S IT-LIMB DOPPLER=DEF Comments: GHRS ECH-A LSA SPECTRUM OF SATURN -30 DEG LAT. SUNLIT LIMB ------------------------------------------------------------------------------------------------------------------------------------ 31 SATURN-SUNL HRS ACCUM 2.0 ECH-A 1217.0 STEP-PATT=9,STEP-TIME=1.0, 7 136 S SEQ 31-33 NON-INT IT-LIMB DOPPLER=DEF,FP-SPLIT = NO Comments: GHRS ECH-A LSA SPECTRUM OF SATURN -30 DEG LAT. SUNLIT LIMB ------------------------------------------------------------------------------------------------------------------------------------ 33 WAVE HRS ACCUM SC2 ECH-A 1217.0 STEP-PATT=9,STEP-TIME=1.0, 1 2 M DOPPLER=DEF,SPYBAL = NO Comments: WAVELENGTH CALIBRATION FOR 29-31: NO SPYBAL SHOULD OCCUR BETWEEN LINES 31 - 33 ------------------------------------------------------------------------------------------------------------------------------------ 5757( 31) - 11/13/96 10:14 - [ 4] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 39 SATURN-OFFS HRS ACCUM 2.0 ECH-A 1217.0 STEP-PATT=9,STEP-TIME=1.0, 3 272 S ET-SKY DOPPLER=DEF,FP-SPLIT = NO Comments: GHRS ECH-A LSA SPECTRUM OF SKY GEO + IPM EMISSIONS NEAR SATURN ------------------------------------------------------------------------------------------------------------------------------------ 41 SATURN-OFFS HRS ACCUM 2.0 ECH-A 1217.0 STEP-PATT=9,STEP-TIME=1.0, 7 136 S SEQ 41-43 NON-INT ET-SKY DOPPLER=DEF,FP-SPLIT = NO Comments: GHRS ECH-A LSA SPECTRUM OF SKY GEO + IPM EMISSIONS NEAR SATURN ------------------------------------------------------------------------------------------------------------------------------------ 43 WAVE HRS ACCUM SC2 ECH-A 1217.0 STEP-PATT=9,STEP-TIME=1.0, 1 2 M DOPPLER=DEF,SPYBAL = NO Comments: WAVELENGTH CALIBRATION FOR 39-41: NO SPYBAL SHOULD OCCUR BETWEEN LINES 41 - 43 ------------------------------------------------------------------------------------------------------------------------------------ 5757( 31) - 11/13/96 10:14 - [ 5] Summary Form for Proposal 5757 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HRS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters STEP-PATT=9 STEP-TIME=1.0 DOPPLER=DEF FP-SPLIT = NO SPYBAL = NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category SOLAR SYSTEM ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PCS MODE F SEQ 11-13 NON-INT SEQ 21-23 NON-INT SEQ 31-33 NON-INT SEQ 41-43 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements ECH-A ------------------------------------------------------------------------------------------------------------------------------------ Target Names SATURN-EQ WAVE SATURN-S-POLE SATURN-SUNLIT-LIMB SATURN-OFFSET-SKY ------------------------------------------------------------------------------------------------------------------------------------