PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 2000-07-18 NOTE = "MGS RST Instrument Health Report HEA0200A.TXT" END_OBJECT = TEXT END Miscellaneous ============= A slightly edited version of Sami Asmar's "Periodic MGS ER Report" is appended to this regular daily health report. Trivia: At 01:20:20 PM PDT today, ERT will be 2000/200-20:20:20. Engineering Data ================ Engineering Data Statistical Summary from CSV2STAT: First SCET: 2000-07-16T00:00:00.017 Last SCET: 2000-07-16T23:59:52.006 CHANNL CHANNEL TITLE DN-LO DN-HI EU-LO EU-HI EU-AVG/STDEV RECDS ------ ------------- ----- ----- --------- --------- ---------/-------- ----- F-0190 HGA_AZ_ANG 6424 11430 1.57E+00 2.79E+00 2.59E+00/8.25E-03 2666 F-0195 HGA_EL_ANG -11233 11089 -2.74E+00 2.71E+00 -4.05E-01/3.54E-02 2666 L-0034 MOT1_RANGING 0 0 5334 L-0036 MOT1_TLM_MOD 0 0 5336 L-0037 MOT1_USO_ENA 0 0 5334 L-0044 MOT2_RANGING 1 1 5334 L-0046 MOT2_TLM_MOD 0 1 5336 L-0047 MOT2_USO_ENA 1 1 5334 L-0053 RF_SW_OSC 2 2 5336 L-0060 TWTA1_FILMNT 0 0 5334 L-0061 TWTA1_HV 0 0 5336 L-0070 TWTA2_FILMNT 0 1 5336 L-0071 TWTA2_HV 0 1 5334 L-0080 USO_PWR 0 0 5334 L-0090 KaBLE_STAT 0 0 5334 L-0091 KaBLE_ENABLE 1 1 5336 L-0111 MOT1_RCV_AGC 255 255 -1.53E+02 -1.53E+02 -1.53E+02/8.09E-07 5334 L-0121 MOT2_RCV_AGC 163 255 -1.53E+02 -1.28E+02 -1.49E+02/1.16E-01 5334 L-0131 TWTA1_HLX_I 0 1 -3.84E-02 -1.85E-02 -3.82E-02/2.28E-05 5334 L-0132 TWTA1_ANOD_V 0 1 -1.00E+03 -1.00E+03 -1.00E+03/1.38E-02 667 L-0141 TWTA2_HLX_I 18 42 3.06E-01 7.85E-01 5.19E-01/2.74E-03 5334 L-0142 TWTA2_ANOD_V 61 229 -8.66E+02 -5.30E+02 -6.77E+02/6.33E+00 667 L-0200 USO_REG_V 203 205 4.06E+00 4.10E+00 4.08E+00/2.58E-04 667 L-0201 USO_OVEN_V 127 129 2.54E+00 2.58E+00 2.56E+00/2.79E-04 667 T-0302 EPC1_T 187 194 -3.30E+00 -3.25E-01 -2.35E+00/2.68E-02 669 T-0303 EPC2_T 182 192 -2.43E+00 1.71E+00 -5.68E-01/4.85E-02 669 T-0310 RF_ISOLTR1_T 229 233 -6.05E+00 -1.15E+00 -3.45E+00/7.62E-03 5336 T-0311 RF_ISOLTR2_T 225 231 -3.52E+00 3.13E+00 -4.86E-01/2.24E-02 5336 T-0312 TWT1_T 228 233 -6.05E+00 -2.48E-02 -2.41E+00/2.77E-02 668 T-0313 TWT2_T 218 232 -4.77E+00 9.37E+00 1.19E+00/1.70E-01 668 T-0315 USO_T 151 156 1.71E+01 1.86E+01 1.79E+01/9.17E-03 669 T-0316 KA_AMP_T 215 219 8.56E+00 1.16E+01 9.96E+00/2.38E-02 666 L-0200, L-0201, and T-0315 are nominal. Open Loop Data ============== Data Collection --------------- We have transferred the following open loop data to Stanford: YYYY/DDD DSS DSP SAMP BW DSP BIT REC RECS RECS MAX START STOP RATE MODE RESN LEN MSSG SNR -------- --- -------- -------- ---- ---- ---- ---- ---- ----- ---- ----- 2000/199 25 14:15:00 14:22:00 5000 2000 2 12 1666 2101 0 45.1 2000/199 25 16:12:00 16:19:00 5000 2000 2 12 1666 2101 0 46.2 2000/199 25 18:10:00 18:17:00 5000 2000 2 12 1666 2101 0 45.7 2000/199 25 20:08:00 20:15:00 5000 2000 2 12 1666 2101 0 44.7 2000/199 25 22:05:00 22:13:00 5000 2000 2 12 1666 2401 0 46.4 2000/200 25 00:03:00 00:10:00 5000 2000 2 12 1666 2101 0 45.9 2000/200 45 02:01:00 02:08:00 5000 2000 2 12 1666 2101 0 47.4 2000/200 45 03:58:00 04:05:00 5000 2000 2 12 1666 2101 0 47.0 2000/200 54 05:56:00 06:03:00 5000 2000 2 12 1666 2101 0 40.8 2000/200 54 07:54:00 08:01:00 5000 2000 2 12 1666 2101 0 45.3 Anomalies --------- Amplitude and frequency noise from solar conjunction continue to abate slowly. Closed Loop Data ================ Data Collection --------------- We have obtained the following files from OSCAR and EPIC: Original File Name Name on SOPC -------------------------------- ------------ ATDF: 00183T187.DAT;1 0184187A.TDF ATDF: 00187T191.DAT;1 0187191A.TDF ATDF: 00191T194.DAT;1 0191194A.TDF ATDF: 00194T196.DAT;1 0194196A.TDF ATDF: 00195T197.DAT;1 0195197A.TDF ATDF: 00197T198.DAT;1 0197198A.TDF ATDF: 00198T200.DAT;1 0198200A.TDF ODF: 001960199_10S.SJO;1 0196199B.ODF ODF: 00196E199.DAT 0196199A.ODF ODF: 001990200_10S.SJO;1 0199200A.ODF TROPCAL: TROPCAL_94_000701_0716_DOPR.CSP;1 0183199A.TRO WEATHER: WEATHER_10_LATEST.TXT;224 00011991.WEA WEATHER: WEATHER_40_LATEST.TXT;224 00011994.WEA WEATHER: WEATHER_60_LATEST.TXT;224 00011996.WEA Ancillary Data ============== Data Collection --------------- We have obtained the following files from the FIS: Original File Name Name on SOPC -------------------------------- ------------ AMD: amdgen.00-199.out 0197198A.AMD OPT: optg_m_000717_OD6076-6078_6333_V1 0199220A.OPT SAK: mgs_solar_array_2000-198.ck 0198198A.SAK SPK: spk_m_000717_OD6076-6078_6333_V1 0199220A.SPK TCK: mgs_spice_c_kernel_2000-198.ck 0198198A.TCK We have obtained the following files from NAIF and/or IPNG: Original File Name Name on SOPC -------------------------------- ------------ AGK: mgs_hga_ck_2000-07-08.bc 0190190A.AGK Periodic MGS ER Report (Sami Asmar) =================================== Campaign F ---------- Calculations at Stanford showed that the date when Earth crosses the MGS orbit plane is on December 7, presenting an opportunity for the long awaited comparison of atmospheric measurements by RS and RES. It is now suggested that Campaign F be moved from the original schedule of November 13-20 to December 3-10. I spoke with Pat Esposito about the timing of campaign F measurements and he will have results of the navigation team computation of the campaign's timing this week. Bruce Waggoner and Jesse Glance will then write an MCR to re-center the campaign. DSN scheduling will then follow. Egress Measurements in August ----------------------------- We found out that the radio occultation egress measurements thought to take place in September will actually be in August. We are making the necessary arrangements for scheduling and data acquisition. We will have one period of 48 hours of continuous coverage Aug 7-9 (DOY 220-222). Another period starts Sep 7 (DOY 251). Conjunction Activities ---------------------- MGS had previously approved a change request allowing Solar Probe to record the MGS radio signal during the conjunction period for telemetry evaluation purposes. Solar Probe surprised us by expanding the scope of the agreement in the last minute and requesting DSP recordings. After consulting with Tom Thorpe, we agreed to provide recordings for a five-day period (30 June - 4 July) on a best effort basis and Aseel scripted the DSP for unattended operations. She ended up working the holiday weekend, supposed to be a break from occultation measurements, to ensure smooth operations. We are now in the process of writing the data files on CDs to deliver to Solar Probe engineers. After consulting with the Team Leader, the data are declared to be in the public domain and the word is informally reaching the solar science community. Data archiving will first be done informally by the JPL Radio Science Systems Group and later in PDS format when time allows. Ranging ------- Due to the discussion at the Radio Science Team Meeting in Toulouse, documented in the minutes, Tom Thorpe noticed the subject of ranging data for the Radio Science team and asked Pat Esposito to revisit activating ranging data after the solar conjunction period. McKinney Leaving ---------------- John McKinney left MGS to become the Mission Manager for Deep Impact. New Light Time File ------------------- Dick Simpson reported no problems with the new light time file format (based on tests run by Joe Twicken). Staffing and Vacations ---------------------- Our MGS Radio Science Operations Engineer, Aseel Anabtawi, will be on vacation for most of the month of August. This had been previously planned due to her brother's wedding in the Middle East. We have just hired Dr. Elias Barbinis into the Radio Science Systems Group and he has started training in operations and data acquisition. Elias comes to us from the Galileo NIMS instrument. Rover Science ------------- I have been asked what possible Radio Science can be obtained from a rover mission in '03. Communications at X-band will be direct from rover to earth. A possible UHF link to an orbiter can also be utilized. Please feel free to suggest ideas (to sami.asmar@jpl.nasa.gov). "Good Enough" Oscillator ------------------------ There are plans for the next Mars orbiter to carry a good quality oscillator but only for the UHF link. It will not be connected to the X-band communications equipment. Stan Butman informed me that this oscillator is two orders of magnitude worse that the USO, around 10e-11. Project Status - from TMOD Status report ---------------------------------------- The spacecraft reached an angle of one degree from the sun on June 29 with closest conjunction to occur on July 2. During this period, the operations team kept close track of timing errors. If this error had reached 90 seconds before July 8, there was a possibility the High Gain Antenna could have come in contact with its boom mount. As of June 29 the discrepancy from the on-board June 12th prediction was only 6 seconds. After July 8 contingency commands were set to correct timing errors or park the HGA if necessary until a new ephemeris was uploaded. The spacecraft resumed nominal mapping operations on July 12 following the special solar conjunction sequences. A timing error of 50 seconds had accumulated prior to use of the July 5th based scripted operations that began on this day. Two sequences and ephemeris calculations are now uploaded each week to ensure sub-second predicted timing accuracy. The Mars Orbiter Camera was successfully reactivated on July 13 and, following checkout, images are now being recorded. The first Radio Science ingess occultation following conjunction was observed at Madrid's 34-meter High Efficiency tracking station (DSS-65) on the night of July 12. The only major surprise of the conjunction period was believed to be a consequence of the different spacecraft configuration. While the solar arrays were in auto-tracking mode a change occurred in the autonomous momentum dumping which caused an acceleration of the ground track walk rate. An 88-day cycle of observations is now displaced from the previous set by only 54-km spacing. Whereas prior to conjunction the separation was 64 km decreasing at the rate of 0.25 km/week vs. the new rate of 6 km/week. In preparing the mid-term science report for a special issue of the Journal of Geophysical Research, the MGS Project Science Team has compiled the ten top science discoveries of the mission, as follows: 1. Evidence for significant remnant magnetization of the Martian crust consistent with an early, vigorous core dynamo. It has been conclusively established that Mars currently has no global magnetic field (Magnetometer (MAG)). 2. The first reliable global models of the structure of the Martian crust and lithosphere, showing two distinct interior provinces that do not correlate globally with the hemispheric dichotomy, as well as evidence for buried basins and possibly channels beneath the northern plains (Radio Science and Mars Orbiter Laser Altimeter (MOLA)). 3. The highest integrity global topographic model produced for any planet including Earth, that reveals the 30-km dynamic range of topography, the pole-to-pole slope that controlled the transport of water in early Martian history, and the flat northern hemisphere, that may represent the location of an ancient ocean (MOLA). 4. Identification of two different surface compositions that point to globally distinctive zones of crustal evolution (Thermal Emission Spectrometer (TES)). 5. Thick layered sequences of strata in the Valles Marineris, possibly volcanic in origin, that would indicate a greater role than previously thought of surface and intrusive volcanism during early to mid-Martian history. Layering is widespread on Mars (Mars Orbiter Camera (MOC)). 6. Detection of coarse-grained hematite, possibly indicative of deposition in a surface hydrothermal environment, and evidence for recent volcanism (TES, MOC and MOLA). 7. Evidence for a complex depositional and erosional history that elucidates the central importance of dust transport on the global and local scale in influencing Mars' current and past climate (MOC). 8. The first reliable estimate of the present-day surface water inventory from the volumes of the polar caps, and evidence for distinctive evolution of the north and south polar caps (MOLA and MOC). 9. Clear evidence of a sapping origin of many channels from probable melting of ground ice and possible evidence for recent liquid water in many spatially isolated regions (MOC). 10. Significantly improved understanding of atmospheric dynamics, from seasonal monitoring of temperature, pressure and opacity, and measurement of cloud heights (TES, Radio Science, MOLA, Accelerometer).