SOHO Daily Meeting Notes Meeting chaired by Eliane Larduinat 29 June 1996 (DOY 181) Notes by Julia Saba/MDI --------------------------------------------------------------------------- Announcements: None ------------- FOT report (by Bud Benefield): ----------- o Spacecraft nominal o No anomalies o Accomplished activities: - Roll Steering Law upload - VIRGO and SWAN loads - CELIAS post-momentum management procedures - VIRGO commanding (OCD #311) o Planned activities: - Roll steering law upload - VIRGO load - 01 July, 1400 UT: get new star (not guide star) - 01 August (DOY 214): 6 hrs for ACU/CMDU memory dumps > N.B.: No NRT available during these 6 hrs of SVM activities, but telemetry (both VC01 and VC2/3) should be unaffected. FOT needs to know if extra contact time required by instruments. o Ground system anomalies: - DOY 180/2028 UT: Commnding glitch while LASCO streaming commands. Something was dropped in stream after leaving POCC. NRT paused and all commands retransmitted. Lost 19 min NRT. > FOT has requested instrument help to test large command loads, e.g., by sending dummy commands for 8 hours. But LASCO would have to suspend science for this period if it participates and MDI does not want to do anything which might interrupt the 2-month continuous Dynamics run. - DOY 180/2047 UT: 51 min of telemetry lost (unrecoverable) due to RFI at Edwards. Also lost 51 min of NRT then. Coordinated operations: ---------------------- o CDS and SUMER coordinating observations of active region which is about to come over East limb. They have been running active region studies on the loop tops. o Position of center of FOVs has been: 960 arcsec E, 60 arcsec S of Sun center. Pointing chosen from Yohkoh and EIT images. o EIT has also been looking at this region, and finds what appear to be open field structures like plumes emerging from about the latitude of the equator, apparently in same area as active region! They have also been looking at a prominence a little north of the equator, which is absorbing emission from the loops behind it. Not yet clear how/if this is related to region further south. (There was a region at about 10 degrees N latitude on previous rotation, but it was decaying.) o CDS, SUMER, and EIT will continue to center on same target latitude, to study further the unusual open fields structures in the midst of the active region vicinity. Instrument status/plans: ----------------------- o CDS nominal. Studied E. limb region until 1000 UT. - Will take 10 hrs for calibrations, then resume active region study at 2000. Had planned to repoint further north to do filament study, but will instead take coordinated observations with SUMER and EIT. o SUMER: nominal. Changed program on short notice to look at E. limb feature. - Studied signatures of emerging features above the limb in Lyman series. Will make another survey of this region later today, then move out along the same radius to study the streamer overlying it. - Tomorrow will run test of new synoptic program. The 12-hr program will be run once a month, surveying the northwest quadrant of the corona near the limb. o UVCS: nominal. Completing synoptic program. Then will study line profiles above the N. pole. o LASCO: assumed nominal (by EIT rep.) o EIT: nominal. Looking at active region all weekend, with 300 arcsec FOV centered just S. of equator. Sees part of a very interesting absorption area to the north, but will stay in current position to continue to study plume region. o MDI nominal. A patch to the flat field was made last night. Lost some high rate data this morning (3-4 mins) when VC2 was started wile two stations were simultaneously on line during handover. The loss is recoverable. (FOT says this was inadvertant, and they'll try to avoid such in the future.) Plan updates: ------------ o Downlink-only times as noted before, including ~1200 UT tomorrow. o Monday's VLA test was removed in the weekly meeting due to lack of sufficient information in time for planning it. AOB: --- No daily meeting tomorrow (Sunday). Meetings resume on Monday as usual.