11649( 22) - 18-Aug-2009 20:03:13 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11649 Version: 22 Check-in Time: 18-Aug-2009 20:03:13 STScI Edit Number: 19 Title Elucidating the mystery of the Io footprint time variations ------------------------------------------------------------------------------------ Type Cycle GO 17 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Jean-Claude M. Gerard Universite de Liege CoI: Mr. Bertrand Bonfond Universite de Liege Y CoI: Dr. Denis Grodent Universite de Liege N CoI: Prof. John T. Clarke Boston University N CoI: Mr. Sven Jacobsen Universitat zu Koeln N CoI: Prof. Joachim Saur Universitat zu Koeln N ------------------------------------------------------------------------------------ Abstract The Io UV footprint (IFP) is an auroral emission on Jupiter consisting of one or more spots resulting from the electromagnetic interaction between Io and the Jovian magnetosphere. Recent UV HST observations of the Jovian aurora raised new issues and put previous interpretations under question. Dedicated STIS Time-tag observations based on only 3 HST orbits will help us to directly answer the following questions and test new hypothesis on the physics driving their associated phenomenon. The proposed observations will determine whether the previously observed short timescale (~2 min) variations of the IFP are periodic or burst events. If the (quasi-)periodicity is established, these constraints will help us to understand the origin of these variations. These observations will also clarify the conditions of occurrence of the unexpected quasi-simultaneous variations of the southern multiple spots of the IFP. Moreover, we propose to observe the emergence of the southern leading (or precursor) spot and the possible evolution of its brightness. These two elements might validate or exclude the recently proposed idea that cross-hemisphere electron beams or strong non-linearities of the electromagnetic interaction explain the presence of the leading and secondary spots. ------------------------------------------------------------------------------------ Observations Description ------------------------ This program consists of 3 STIS FUV-MAMA timetag sequences dedicated to the study of the variability of the Io auroral footprint (IFP) on Jupiter's southern hemisphere. In order to avoid buffer overflows, only a restricted part of the planetary disk (i.e. 35-45%) should appear on the image. Since the size of the planetary disk is related to the HST-Jupiter distance, the precise offset will require small corrections depending on the observation date. Moreover, offsets leading to Io footprint features hidden by the reppeller wire shadow should also be avoided. Consequently, the final pointing offset will be determined with the Contact Scientist or the Program Coordinator once the HST orbit dates are known with sufficient accuracy. Real Time Justification ----------------------- 11649( 22) - 18-Aug-2009 20:03:13 - [ 2] Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 11649( 22) - 18-Aug-2009 20:03:13 - [ 3] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 TARGET NAME: JUPITER-SOUTH-1 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: PLANET OFFSET JUPITER ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 STD=JUPITER TYPE=POS_ANGLE, RAD=23, ANG=158, REF=NORTH ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS OLG OF IO BETWEEN 130 200, CML OF JUPITER FROM IO BETWEEN 90 120 ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = -2.5 +/- 0.5 This target is for observations of UV emissions from Jupiter's south polar region. The offset position is such that the south polar quadrant of Jupiter lies in the Ephemeris Center: EARTH 25x25 arc sec STIS FUV MAMA field of view. The area of the planet disc in the FOV is limited to 35-45% so that the total counting rate due to reflected sunlight is less than 20, 000 c/s. Moreover, one should avoid placing the Io footprint features just under the repeller wire shadow. We will need to interact with the CS/PS to set the appropriate pointing offset once potential observing dates have been released. ------------------------------------------------------------------------------------------------------------------------------------ 11649( 22) - 18-Aug-2009 20:03:13 - [ 4] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 2 TARGET NAME: JUPITER-SOUTH-2 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: PLANET OFFSET JUPITER ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 STD=JUPITER TYPE=POS_ANGLE, RAD=23, ANG=175, REF=NORTH ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS OLG OF IO BETWEEN 110 185, CML OF JUPITER FROM IO BETWEEN 140 175 ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = -2.5 +/- 0.5 This target is for observations of UV emissions from Jupiter's south polar region. The offset position is such that the south polar quadrant of Jupiter lies in the Ephemeris Center: EARTH 25x25 arc sec STIS FUV MAMA field of view. The area of the planet disc in the FOV is limited to 35-45% so that the total counting rate due to reflected sunlight is less than 20, 000 c/s. Moreover, one should avoid placing the Io footprint features just under the repeller wire shadow. We will need to interact with the CS/PS to set the appropriate pointing offset once potential observing dates have been released. ------------------------------------------------------------------------------------------------------------------------------------ 11649( 22) - 18-Aug-2009 20:03:13 - [ 5] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 3 TARGET NAME: JUPITER-SOUTH-3 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: PLANET OFFSET JUPITER ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 STD=JUPITER TYPE=POS_ANGLE, RAD=23, ANG=175, REF=NORTH ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS OLG OF IO BETWEEN 115 185, CML OF JUPITER FROM IO BETWEEN 175 215 ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = -2.5 +/- 0.5 This target is for observations of UV emissions from Jupiter's south polar region. The offset position is such that the south polar quadrant of Jupiter lies in the Ephemeris Center: EARTH 25x25 arc sec STIS FUV MAMA field of view. The area of the planet disc in the FOV is limited to 35-45% so that the total counting rate due to reflected sunlight is less than 20, 000 c/s. Moreover, one should avoid placing the Io footprint features just under the repeller wire shadow. We will need to interact with the CS/PS to set the appropriate pointing offset once potential observing dates have been released. ------------------------------------------------------------------------------------------------------------------------------------ 11649( 22) - 18-Aug-2009 20:03:13 - [ 6] Visit: 01 Visit Requirements: ORIENT 60D TO 68 D; BETWEEN 11-SEP-2009:00:00:00 AND 12-SEP-2009:00:00:00 On Hold Comments: Additional Comments: Target defintions are time-specific. BETWEEN can be changed if necessary, but the target definitions would need to be changed to match. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 JUPITER-SOU STIS/FUV TIME-TA F25SRF2 MIRROR BUFFER-TIME=99.0 1 2688 S GS ACQ SCENARIO BASE1B3 TH-1 -MAMA G ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ JUPITER-SOUTH-1 1 STIS/FUV TIME-TA F25SRF2 MIRROR none none none none 1 N/A -MAMA G 11649( 22) - 18-Aug-2009 20:03:13 - [ 7] Visit: 02 Visit Requirements: BETWEEN 31-AUG-2009:00:00:00 AND 01-SEP-2009:00:00:00 On Hold Comments: Additional Comments: Target defintions are time-specific. BETWEEN can be changed if necessary, but the target definitions would need to be changed to match. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 JUPITER-SOU STIS/FUV TIME-TA F25SRF2 MIRROR BUFFER-TIME=99.0 1 2728.0 S TH-2 -MAMA G ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ JUPITER-SOUTH-2 1 STIS/FUV TIME-TA F25SRF2 MIRROR none none none none 1 N/A -MAMA G 11649( 22) - 18-Aug-2009 20:03:13 - [ 8] Visit: 03 Visit Requirements: ORIENT 68D TO 69 D; BETWEEN 31-AUG-2009:00:00:00 AND 01-SEP-2009:00:00:00 On Hold Comments: Additional Comments: Target defintions are time-specific. BETWEEN can be changed if necessary, but the target definitions would need to be changed to match. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 JUPITER-SOU STIS/FUV TIME-TA F25SRF2 MIRROR BUFFER-TIME=99.0 1 2728.0 S TH-3 -MAMA G ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ JUPITER-SOUTH-3 1 STIS/FUV TIME-TA F25SRF2 MIRROR none none none none 1 N/A -MAMA G 11649( 22) - 18-Aug-2009 20:03:13 - [ 9] Summary Form for Proposal 11649 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures F25SRF2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/FUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=99.0 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 11-SEP-2009:00:00:00 AND 12-SEP-2009:00:00:00, BETWEEN 31-AUG-2009:00:00:00 AND 01-SEP-2009:00:00:00, GS ACQ SCENARIO BASE1B3, ORIENT 60D TO 68 D, ORIENT 68D TO 69 D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names JUPITER-SOUTH-1, JUPITER-SOUTH-2, JUPITER-SOUTH-3 ------------------------------------------------------------------------------------------------------------------------------------