18 May 1998 SOHO Daily Meeting Minutes Chairs: Joan Hollis (SOC)/ Bill Thompson (SOL) Notes: Kevin Schenk (EIT) FOT BRIEFING ------------ Spacecraft Status: Nominal Spacecraft Anomalies: 135/2003 CDS Not Acknowledging OBDH Commands. Process failure hung instrument. 135/2245 CDS Not Acknowledging OBDH Commands. Accomplished Activities: DAY 135: RSL,VIRGO,CELIAS,SWAN,SUBMODE 4 @ 2000 DAY 136: RSL,VIRGO,CELIAS,MDI DAY 137: RSL,VIRGO,NONCOHO,CELIAS,MDI,SUBMODE 6 @ 2020 Planned Activities: RSL,VIRGO Upcoming Operations: 3/31 TR MAINT/MEMORY DUMPS Ground Anomalies: 135/1055 Unable to switch commanding between strings. Local switch out. Delayed string swap. 135/1554 5 Min TM Dropout D66 Switch of circuit between JPL and SPC60 Recoverable. 135/1820 Loss of TGC I/F during coherency switch, D66. TM recorded on SSR. Station was unable to reacquire TM prior to LOS. 136/0145 45 Min Degraded Data D46 Bad TGC Channel. 0151-0204 recoverable from SSR 136/0421 Prime Pocc String Crash 136/1449 30 Sec TM Dropout D66 SFG Problem Recoverable 136/2038 52 Sec TM Dropout D16 TCA Failure Recoverable 136/2235 7 Min Commanding Lost D16 Loss of Lock on RCVR #2. 137/0117 Prime CMS Autoreboot D46 CMS-ECS link broken 137/1350 6 Min Late AOS D16 TGC Problem. 3 Min CMD delay 137/1948 RCVR 1 Lost Lock on Uplink D16 Corrective action triggered. Putting S/C in 1-way mode causing TM dropout until station reconfigured. Also occured at 2338. TM Dropouts: 1948-1955,2337-2343 and 2349-2353. Nonrecoverable The Sun: -------- Space Weather Outlook-via NOAA SOLAR ACTIVITY IS EXPECTED TO BE LOW, WITH C-CLASS ACTIVITY POSSIBLE FROM EITHER REGION 8218 OR 8222. THE GEOMAGNETIC FIELD IS EXPECTED TO BE QUIET TO UNSETTLED FOR THE NEXT THREE DAYS. LASCO observed SOHO-51 Sungrazing Comet Saturday May 16-17 in C3 and C2 fields of view. Standard Kreutz orbit path, south polar direction. Large stable prominence on SSE limb very visible in both EIT 304A and 195A as well as the H-Alpha images. SSW prominence on limb noted 'good for observations'. JOP_075 target AR 8218 today. Instruments: ------------- EIT: Nominal. Submode 4 over the weekend with only synoptic 4 times daily. Sunday evening 21:00 UT Submode; 6 started CME watch 195A Today: the same TRACE: Nominal. Weekend: Did coordinated observations with SUMER in the quiet sun north of disk center, with 1 minute cadence for 4 hours. Observed southwest limb filament with 171/195, Ran JOP 72 at -40,340. Active region 8222 studies with C IV rapid variability, sunspot oscillations. Today: Coronal hole on southwest, 340, -415 From 09:00-12:00 observed south pole, polar plumes. Blinkers campaign. JOP_075 at AR 8218 tonight through mid-day tomorrow. Calibrations performed afterwards. CDS: Nominal. Low rate telemetry over the weekend. 2 System crashes. First one due to TLM submode change which interupted some observations. Observed north coronal holes and performed Streamer studies. During Medium rate TLM continued synoptics. Today: Polar plumes with TRACE/MDI earlier. Blinkers campaign. Tonight JOP_075 at AR 8218. UVCS: Nominal. Weekend: Observed position angle 340, at the coronal hole, quiet sun interface, from 1.6 to 3.5 solar radii. Sunday, observed angle 281, with the Mars Global Surveyor through Wednesday from 1.6 to 7.0 solar radii, along with synoptic program. MDI: Nominal. Weekend: High resolution MAGS in 3 variables for JOP_072. Today: Full disk MAGS for North Polar plumes campaign. Will be switching to high-res field for Blinkers Studies. At 19:00 changing to full disk MAGS to support JOP_075. LASCO: Nominal. Weekend: Running submode 4 synoptic program. Sunday observed in C2 with Mars Global Surveyor from 21-22 UT today. Today: Synoptic program. C2 Mars Global Surveyor 21-22 UT. Tomorrow: C1 Fabrey-Perot engineering during NRT. SUMER: Detector OFF. Weekend: In high rate TLM from Friday 20:00 till Sunday 20:00 UT.