SOHO Daily Meeting Minutes for Tuesday, 10 October 2000 ANNOUNCEMENTS ------------- * There is a launch of a spacecraft called Genesis that will impact greatly the DSN support received by many missions including SOHO -- including the possiblity of data loss. The present launch date is February 10. Teams are warned not to schedule any important science observations on this day and perhaps up to a week following in the event of launch slips. FOT REPORT ---------- Spacecraft Status: Nominal Spacecraft Anomalies: 280/1843 Single DMA Failure Over 1 Format as COBS failed to acquire one science packet. 283/2338 Tracking star in slot 5 was lost, as it traveled outside of the SSU FOV. Accomplished Activities: DOY 280: VIRGO, SWAN x2, RSL, New control star, mag = 6.85 Acquired new tracking star, mag = 7.10 Executed SWAN recovery from the Sensor Unit 1 Power Supply trip DOY 281: VIRGO DOY 282: VIRGO, Noncoho Load, Flight S/W Maint DOY 283: VIRGO, SWAN, Acquired new tracking star, mag = 7.05 Planned Activities: VIRGO, RSL, New control star, mag = 7.1, New tracking star, mag = 7.6 Upcoming Operations: 10/27 SK/MM Maneuvers Ground Anomalies: 281/0120 AOS with D46 was 20 minutes late due to Big/Little Pipe failure caused by solar interference. Data recoverable via SSR, except for lost MDI high rate telemetry. 281/1338 JPL experiencing line hits, cause unknown. Lost 1 minute and 32 seconds of recoverable data and command ability. One NRT command had to be retransmitted twice. 281/1446 Big/Little Pipe failure due to solar interference between JPL and Madrid. Lost 4 minutes of recoverable data. 282/0050 AOS with D46 was 68 minutes late due to Big/Little Pipe failure caused by solar interference. Delayed SVM activities until D66 support. Data recoverable via SSR, except for lost MDI high rate telemetry. 282/1541 Commands failed to reach the spacecraft due to reasons unknown. Dropped carrier and triggered Std. Mon. 30, making the spacecraft non-coherent. Resumed commanding on next (D27) support. Lost 4 min 52 sec of unrecoverable TLM, including the 1600 magnetogram. Lost command ability for 31 minutes. 282/1606 AOS was 6 minutes late as D27 was unable to get on point due to a command interface failure. Data recoverable from D66. 283/0231 Degraded data from D46 due to Big Pipe failure caused by solar interference. Data degraded from 0231 to 0248 (17 minutes). SSR dump was restart once the Big Pipe was available again. Lost 4 minutes of unrecoverable real-time data. 283/0845 Commanding activites on D66 delayed 29 minutes due to a CPA failure at the site. 284/0022 Lost/degraded TLM from D46 due to line problems at JPL caused by solar interference. Lost 50 sec of unrecoverable data. Total of 11 min of degraded data, with any lost packets being unrecoverable. JOP INFORMATION --------------- JOP131 will focus on 9182 for tomorrow, N02 W02 Heliographic (x=20", y=-90" SOHO coordinates) at 00:00 UT on 9 October JOP104 stays at x=-980" y=-325" (SOHO coordinates, SUMER slit from y =-475" to -175"), S15 deg, E 90 deg heliographic at limb. INSTRUMENT STATUS ----------------- CDS: Nominal. JOP104 and JOP131 support. Polarity reversal studies. SUMER: Nominal. JOP104 continues. Saw two events last night at ~ 02:00 and 05:00 UT. On Thursday morning they will shift the JOP104 pointing to north of the equator.. to catch an active region that should be coming around the limb by then. UVCS: Nominal. JOP104 and mini-synoptics. Still to be determined if they will be observing the comet discovered by LASCO. LASCO: Nominal. C2/C3 synoptics. Discovered a sun-grazing comet in C3 yesterday. They will modify their program slightly to observe this comet. EIT: Nominal. CME watch and JOP131 support. MDI: Nominal. Full disk program continues in support of JOP131. TRACE: Nominal. Supporting JOP131 with 171 Angstrom images. They have been losing some passes (and a few hours of data) due to the space shuttle launch delays.