17196( 3) - 07-Sep-2023 20:02:28 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17196 Version: 3 Check-in Time: 07-Sep-2023 20:02:28 STScI Edit Number: 0 Title Identifying the Hydrogen Excess in the Stagnation Region at the Heliospheric Interface ------------------------------------------------------------------------------------ Type Cycle GO 30 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. John T. Clarke Boston University Y CoI: Dr. Jean-Loup C Bertaux LATMOS N CoI: Dr. Vladislav V. Izmodenov Sternberg State Astronomical Institute N CoI: Dr. Olga Katushkina Self-employed N CoI: Dr. Rosine Lallement Observatoire de Paris N CoI: Dr. Majd A Mayyasi Boston University N CoI: Prof. Merav Opher Boston University N CoI: Dr. Eric Quemerais LATMOS N ------------------------------------------------------------------------------------ Abstract The nature of the interaction of the solar wind with the interstellar medium at the heliospheric interface has been the subject of much study with Voyagers 1 and 2, ground-based telescopes, and the IBEX mission. Theoretical models for the nature of the interaction still do not conform to the experimental data, including the presence of excess hydrogen Lyman-alpha emission in the interface region. One of the main puzzles is the nature of the so-called stagnation region at the boundary between the solar wind and interstellar medium, for which there is evidence in Voyager and New Horizons data. The indications are that this region is characterized by a population of high velocity H atoms, which can be used as a remote diagnostic. It is also possible that part of the excess emission is from galactic Lyman-alpha, as modeled for the Voyager UV data. This program will use STIS echelle line profiles of the interplanetary H Lyman-alpha emission to map the velocity distribution and either identify or rule out the presence of either a population of H atoms in the "stagnation" region of the heliospheric interface or diffuse emission from the galaxy. This is not possible in existing HST data sets due to the interference of geocoronal emission with the expected high velocity wings of the emission lines. ------------------------------------------------------------------------------------ Observations Description ------------------------ This program will use STIS echelle line profiles of the interplanetary H Lyman-alpha emission to map the velocity distribution and either identify or rule out the presence of either a population of H atoms in the "stagnation" region of the heliospheric interface or diffuse emission from the galaxy. This is not possible in existing HST data sets due to the interference of geocoronal emission with the expected high velocity wings of the emission lines. ------------------------------------------------------------------------------------ 17196( 3) - 07-Sep-2023 20:02:28 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 IPH-UPWIND-1 ISM, UNDESIGNATED RA=16H54M0.0000S +/- 10", J2000 V = 0 +/- 0 300-1000 Rayleighs DEC=-15D30'0.00" +/- 10" Reference Frame: Other: Sky Background Extended: YES Comments: STIS SPECTRA OF INTERPLANETARY HYDROGEN, I.E. OBSERVE SKY WITH NO STARS MV < 18 IN APERTURE LOOKING IN THE FLOW DIRECTION (UPWIND) NOTE THAT EMISSION TO BE OBSERVED IS DIFFUSE ACROSS THE SKY - THUS TWO GYRO POINTING IS OK Measured total count rate from prior observations in this mode (GO 8650) is 5 counts/sec per kilo-Rayleigh, and we expect about 1 kR from the IPH and 5-10 kR from the geocorona - so a total count rate of less than 100 counts per second Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0 ------------------------------------------------------------------------------------------------------------------------------------ 2 IPH-UPWIND-2 ISM, UNDESIGNATED RA=16H54M0.0000S +/- 10", J2000 V = 0 +/- 0 300-1000 Rayleighs DEC=-15D30'0.00" +/- 10" Reference Frame: Other: Sky Background Extended: YES Comments: STIS SPECTRA OF INTERPLANETARY HYDROGEN, I.E. OBSERVE SKY WITH NO STARS MV < 18 IN APERTURE LOOKING IN THE FLOW DIRECTION (UPWIND) NOTE THAT EMISSION TO BE OBSERVED IS DIFFUSE ACROSS THE SKY - THUS TWO GYRO POINTING IS OK Measured total count rate from prior observations in this mode (GO 8650) is 5 counts/sec per kilo-Rayleigh, and we expect about 1 kR from the IPH and 5-10 kR from the geocorona - so a total count rate of less than 100 counts per second Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0 ------------------------------------------------------------------------------------------------------------------------------------ 17196( 3) - 07-Sep-2023 20:02:28 - [ 3] Visit: 01 (IPH-Upwind-1) Visit Requirements: BETWEEN 24-MAR-2023:00:00:00 AND 04-APR-2023:00:00:00 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 IPH-UPWIND- STIS/FUV TIME-TA 52X0.5 E140H 1234 BUFFER-TIME=4000, WAVECAL=NO 1 2550 S 1 -MAMA G (2550 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1234 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ IPH-UPWIND-1 1 STIS/FUV TIME-TA 52X0.5 E140H 1234 none none none none 1 N/A -MAMA G WAVE 2 STIS/FUV ACCUM 0.2X0.09 E140H 1234 none none none none 1 N/A -MAMA 17196( 3) - 07-Sep-2023 20:02:28 - [ 4] Visit: 02 (IPH-Upwind-2) Visit Requirements: BETWEEN 22-AUG-2023:00:00:00 AND 08-SEP-2023:00:00:00 On Hold Comments: Additional Comments: Visits 2-6 are all the same but entered as separate one-orbit visits to help with scheduling. If possible please schedule so that each visit takes place when STIS HV is firt turned on to limit thermal background on the MAMA. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 IPH-UPWIND- STIS/FUV TIME-TA 52X0.5 E140H 1234 BUFFER-TIME=4000, WAVECAL=NO 1 2550 S 2 -MAMA G (2550 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1234 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ IPH-UPWIND-2 1 STIS/FUV TIME-TA 52X0.5 E140H 1234 none none none none 1 N/A -MAMA G WAVE 2 STIS/FUV ACCUM 0.2X0.09 E140H 1234 none none none none 1 N/A -MAMA 17196( 3) - 07-Sep-2023 20:02:28 - [ 5] Visit: 03 (IPH-Upwind-3) Visit Requirements: BETWEEN 22-AUG-2023:00:00:00 AND 08-SEP-2023:00:00:00 On Hold Comments: Additional Comments: Visits 2-6 are all the same but entered as separate one-orbit visits to help with scheduling. If possible please schedule so that each visit takes place when STIS HV is firt turned on to limit thermal background on the MAMA. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 IPH-UPWIND- STIS/FUV TIME-TA 52X0.5 E140H 1234 BUFFER-TIME=4000, WAVECAL=NO 1 2550 S 2 -MAMA G (2550 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1234 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ IPH-UPWIND-2 1 STIS/FUV TIME-TA 52X0.5 E140H 1234 none none none none 1 N/A -MAMA G WAVE 2 STIS/FUV ACCUM 0.2X0.09 E140H 1234 none none none none 1 N/A -MAMA 17196( 3) - 07-Sep-2023 20:02:28 - [ 6] Visit: 04 (IPH-Upwind-4) Visit Requirements: BETWEEN 22-AUG-2023:00:00:00 AND 08-SEP-2023:00:00:00 On Hold Comments: Additional Comments: Visits 2-6 are all the same but entered as separate one-orbit visits to help with scheduling. If possible please schedule so that each visit takes place when STIS HV is firt turned on to limit thermal background on the MAMA. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 IPH-UPWIND- STIS/FUV TIME-TA 52X0.5 E140H 1234 BUFFER-TIME=4000, WAVECAL=NO 1 2550 S 2 -MAMA G (2550 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1234 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ IPH-UPWIND-2 1 STIS/FUV TIME-TA 52X0.5 E140H 1234 none none none none 1 N/A -MAMA G WAVE 2 STIS/FUV ACCUM 0.2X0.09 E140H 1234 none none none none 1 N/A -MAMA 17196( 3) - 07-Sep-2023 20:02:28 - [ 7] Visit: 05 (IPH-Upwind-5) Visit Requirements: BETWEEN 22-AUG-2023:00:00:00 AND 08-SEP-2023:00:00:00 On Hold Comments: Additional Comments: Visits 2-6 are all the same but entered as separate one-orbit visits to help with scheduling. If possible please schedule so that each visit takes place when STIS HV is firt turned on to limit thermal background on the MAMA. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 IPH-UPWIND- STIS/FUV TIME-TA 52X0.5 E140H 1234 BUFFER-TIME=4000, WAVECAL=NO 1 2550 S 2 -MAMA G (2550 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1234 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ IPH-UPWIND-2 1 STIS/FUV TIME-TA 52X0.5 E140H 1234 none none none none 1 N/A -MAMA G WAVE 2 STIS/FUV ACCUM 0.2X0.09 E140H 1234 none none none none 1 N/A -MAMA 17196( 3) - 07-Sep-2023 20:02:28 - [ 8] Visit: 06 (IPH-Upwind-6) Visit Requirements: BETWEEN 22-AUG-2023:00:00:00 AND 08-SEP-2023:00:00:00 On Hold Comments: Additional Comments: Visits 2-6 are all the same but entered as separate one-orbit visits to help with scheduling. If possible please schedule so that each visit takes place when STIS HV is firt turned on to limit thermal background on the MAMA. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 IPH-UPWIND- STIS/FUV TIME-TA 52X0.5 E140H 1234 BUFFER-TIME=4000, WAVECAL=NO 1 2550 S 2 -MAMA G (2550 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1234 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ IPH-UPWIND-2 1 STIS/FUV TIME-TA 52X0.5 E140H 1234 none none none none 1 N/A -MAMA G WAVE 2 STIS/FUV ACCUM 0.2X0.09 E140H 1234 none none none none 1 N/A -MAMA 17196( 3) - 07-Sep-2023 20:02:28 - [ 9] Visit: 07 (IPH-Upwind-22) Visit Requirements: BETWEEN 18-SEP-2023:00:00:00 AND 25-SEP-2023:00:00:00 On Hold Comments: Additional Comments: Visits 2-6 are all the same but entered as separate one-orbit visits to help with scheduling. If possible please schedule so that each visit takes place when STIS HV is firt turned on to limit thermal background on the MAMA. This visit (IPH-Upwind-22 or visit 7) is a repeat of visit 2 which was HOPR'd due to failed guide star acq. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 IPH-UPWIND- STIS/FUV TIME-TA 52X0.5 E140H 1234 BUFFER-TIME=4000, WAVECAL=NO 1 2550 S 2 -MAMA G (2550 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WAVE STIS/FUV ACCUM 0.2X0.09 E140H 1234 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ IPH-UPWIND-2 1 STIS/FUV TIME-TA 52X0.5 E140H 1234 none none none none 1 N/A -MAMA G WAVE 2 STIS/FUV ACCUM 0.2X0.09 E140H 1234 none none none none 1 N/A -MAMA 17196( 3) - 07-Sep-2023 20:02:28 - [ 10] Summary Form for Proposal 17196 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 0.2X0.09, 52X0.5 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/FUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=4000, WAVECAL=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 18-SEP-2023:00:00:00 AND 25-SEP-2023:00:00:00, BETWEEN 22-AUG-2023:00:00:00 AND 08-SEP-2023:00:00:00, BETWEEN 24-MAR-2023:00:00:00 AND 04-APR-2023:00:00:00 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements E140H ------------------------------------------------------------------------------------------------------------------------------------ Target Names IPH-UPWIND-1, IPH-UPWIND-2, WAVE ------------------------------------------------------------------------------------------------------------------------------------