FINAL MINUTES FOR SOHO 29 May 2009 SPWG MEETING
1. Boundary conditions
a) Orbit, attitude and manoeuvres - SOHO is upside down (180 degrees). - manoeuvres To the degree possible, manoeuvres take place during the last days of 34-m keyholes. Currently proposed or set manoeuvre dates are: Aug 11 (TBC) station-keeping and momentum management Aug 13 (TBC) roll (to approximately 0 degrees) Nov 6 or 9 (TBC) station-keeping, momentum management and roll (to approximately 180 degrees) b) Communications with the spacecraft Graphical DSN schedule: http://soho.nascom.nasa.gov/soc/dsn/ Keyhole dates for the next 6 months (All keyhole information is available at or via http://soho.nascom.nasa.gov/soc/keyholes.html): * Jul 22-Aug 20 26m Keyhole * Jul 29-Aug 13 34m Keyhole * Jul 22-Aug 20 26m Keyhole * Jul 29-Aug 13 34m Keyhole * Oct 27-Nov 13 26m Keyhole * Oct 31-Nov 9 34m Keyhole - End-of-pass handling during MDI continuous contact periods To avoid problems with transmitter masks at the end of passes during MDI continuous, DSN has requested we bring the carrier down 30 min before the end of pass. As a result, the last 30 min of all MDI continuous contacts will be TM only. For ranging passes, the spacecraft will be transitioned to record ~1 h before the end of the pass. The station will drop the carrier and re-sweep into receiver 2. The spacecraft will then be transitioned back to VC2 and VC3. - DSN 26 m antenna decommissioning and the keyholes DSN is in the process of decommissioning its 26 m antennae --- the only one left is DSS-46. According to current plans DSS-46 is to be decommissioned Oct 31, 2009. DSS-46 may, however, be decommissioned as early as Aug 3, 2009 and SOHO is preparing a request to postpone the decommissioning until after the 2010 60-day continuous contact for the SOHO/MDI-SDO/HMI cross-calibration. Since the current high-gain antenna (HGA) position along the unmoved axis has been optimized for 26 m antennas, the spacecraft team is investigating moving the HGA to a position optimized for 34 m antennae. Such a change would shorten or remove the keyholes, but DSN resource allocation issues and possible impacts on MDI and MDI/SDO-HMI cross-calibration period need to be addressed. For analyses and details see the minutes of Science Working Team meeting number 40 (available at http://sohowww.nascom.nasa.gov/operations/SWT/Minutes/swt40.pdf, pages 38--41). c) KNOWN submode (SM) dependent activities/submode changes: * TOO JOP153/MMOP003 Future Major Flare Watch (SM5 if SUMER observes target, SM6 otherwise) * Jun 1-Jul 10 Sunrise 5-day balloon flight * Jun 25, Jul 2 EIT shutterless #36 (time TBC) * Oct 8, 15 EIT shutterless #37 (time TBC) * Jan 7, 15 EIT shutterless #38 (time TBC) SUMER campaign dates may overlap with keyholes. Such overlaps shall be scheduled only if periods of no SUMER data between passes are acceptable. SUMER will observe during the Sunrise balloon flight. Note, that the balloon launch is scheduled for Jun 1 - Jul 5 and the duration is expected to be 5 days. SUMER has also inquired about two-day testing period in Jun 2-5 (possibly not contiguous with the Sunrise flight) and a short period of SUMER-Hinode joint prominence observations after Sunrise flight has been proposed by Len Culhane. Timings of these SUMER activities are TBC. For submode change plan for the Sunrise flight see the Sunrise entry in section 2a below. EIT acknowledges that the Sunrise flight needs take priority. Except for Major Flare Watches, TRACE will be doing full disk mosaics if/when EIT is not able to do synoptic sets due to keyhole operations. d) Instrument maintenance activities EIT bakeouts will take place during keyholes. Next bakeout timing is TBD. e) Spacecraft maintenance activities Since the FOT staffing (and hence the FOT's resources to implement changes quickly) will decrease towards the end of this calendar year, all instrument teams are reminded to review not only thermal, but also other limits as well as TSTOL procedures and scripts for possible changes. f) Others TRACE eclipse season began on 13 Sep 2008 and will be ongoing, except for the following predicted non-eclipse period in 2009: Jul 28 -- Sep 9 TRACE will not perform science operations from May 15 - July 20, and from September 30 through early December. Daytime weekday passes of Mon-Wed are currently automated but attended. Thu-Fri passes remain crewed for training and proficiency reasons. Date of transition to unattended daytime automation remains TBD. NRT during automated passes (both weekend and weekday) is currently paused (briefly) regularly for resets of software anomalies. NRT schedule (which includes the pauses) for all automated passes can be found at http://sohowww.nascom.nasa.gov/soc/nighttime_nrt.txt. The development of a software anomaly detection system (which would pause NRT only when needed instead of the current regular pauses) has been put on hold due to problems in development.
2. Priorities for the coming month and more
a) Joint observing plans and campaigns Continuing campaigns: * 2002/02/25-- JOP136 Default RHESSI Collaborations (#6850), POC: Tero Siili * 2003/05/13-- Default CDS Co-observations with TRACE (#6950) * 2005/09/20-- JOP153/MMOP003 Future Major Flare Watch (#8008) * 2007/03/20-- Default CDS/Hinode-EIS co-observations (#7200) Campaign #6850 is for "individual instrument studies" selecting an active region target [partially] influenced by the Max Millennium target selection to maximise chances of serendipitous co-observations. EIT supports all with half/full-res 195 A CME watch in submode 5/6. It is clear that STEREO-EUVI provides adequate "context" information for RHESSI flare observations. Routine EIT submode and resolution switches are probably no longer needed. * Mar 16 - Sep LASCO C2pB for Tomography Reconstruction, POC: Angelos Vourlidas, Richard Frazin * Mar 27- JOP 222 (ToO) Detecting the Origin of Shock-Accelerated Solar Energetic Particles, LASCO/STEREO-SECCHI POC: Angelos Vourlidas LASCO is ready to run the JOP, awaiting a target. * May 15-Jul 20 TRACE not performing science operations * May 17-Jul 21 MDI 60-day continuous contact MDI will run p30vr_fd_c1, a full disk, 1 minute cadence Velocity and Continuum campaign during the 60 day CC along with the usual 96 minute Full Disk synoptic Magnetograms and Continuum. The only possible change to this observing sequence will be to change to p30vr_fd_m1, a full disk, 1 minute cadence Velocity and Magnetogram campaign to support the 5 day Sunrise balloon flight. * Jun 1-Jul 10 Sunrise 5-day balloon flight, MDI/SUMER/TRACE, POC: Davina Innes In June or July 2009 a balloon borne solar observatory called 'Sunrise' is planned to be launched and SoHO (at least MDI and SUMER) as well as TRACE supports have been requested. The launch date will be sometime between Jun 1 and Jul 5, 2009 and the flight lasts 5 days. Coordinated observations with SoHO would therefore be for five days sometime between 1 June to 10 July 2009. NOTE: TRACE has announced, that no science operations will be conducted from May 15 - July 20 (see also section 2c and http://chippewa.nascom.nasa.gov/TRACE/ops/timeline/monthly_plan/current_plan.txt). A short description of SUNRISE is given in http://star.mpae.gwdg.de/Sunrise/project/publicat/SPIE_2004.pdf To facilitate co-observations with ground based telescopes and satellite instruments, a webpage has been created which will include all required informations for co-observations. The URL is: http://www.mps.mpg.de/services/sunrise/sot/sot.php The page contains the complete observation timeline for the first SUNRISE science flight, including timing and pointing information. For each SUNRISE observing program the required co-observations will be specified. Some of this information may at this time (21 May) be only partly included but will be completed within the next days. The exact timing information will be known not until the instrument is launched and commissioning is completed. Moreover, the launch date is depending on technical readiness and mainly weather conditions at the launch site. A tentative timeline of the flight is below (for further details see the website given above): Major milestones (x = moment of tether cutting): x - 3 weeks: Hardware arrives at lauch facilty x - 3 days : Launch readiness review x - 3 days : SUMER opens aperture door (remotely) x -24 hours: Next day launch announcement x + 1 hour : Launch confirmed x + 6 hours: Ascent completed x + 6 hours: Switch-on sequence and initial tests x +12 hours: SUNRISE operational x +12 hours: SOHO submode switch x + 5 days : Science operations completed Submode change 6 -> 5 is proposed to take place during the next working shift after SUNRISE is launched. The timing will be set to allow CDS to reach safe state immediately after a possible crash and continue its recovery as soon as NRT becomes available thereafter (facilitated by SOHO being in continuous contact). A more detailed timeline is below: Time Activity UT EDT CEST 0300-0530 2300-0130 0500-0730 Decision to launch Sunrise 0530-0800 0130-0300 0730-1000 Sunrise launch 1030-1300 0800-1030 1230-1500 Start of observations The submode change has been proposed to take place 1200-1330 0800-0930 1000-1130 or as soon after SVM as possible. MDI can support with full-disk, 1-min cadence magnetograms and dopplergrams if there is high rate at the time. MDI support will be the ONLY interruption to the 60 day CC plans of running a Full Disk Velocity and Continuum campaign. See above notes for the 60 day CC period. SOHO will NOT go to record at any point for this flight since it will occur during the 60 day Continuous Contact period. * Jun 6-Jul 15 SUMER-Hinode prominence observations (TBC), SUMER/CDS/Hinode POC: Werner Curdt, Len Culhane, Tom Berger Joint SUMER-Hinode observations after the Sunrise campaign have been proposed. Duration is not known and timing is dependent on the Sunrise. In the absence of detailed information, we have assumed here a 5-day period after Sunrise mission end. CDS will participate/support and requests to be added to the mailing list. MDI will only be able to provide either Full Disk Dopplergrams and Continuum images along with the usual 96 minute synoptic Full Disk Magnetograms/Continuum images. * Jun 25 (TBC) EIT shutterless #36 run 1 Hopefully no conflict between Sunrise and SUMER 5-day observations. Due to the continuous contact can possibly be adjusted. * Jul 2 (TBC) EIT shutterless #36 run 2 Hopefully no conflict between Sunrise and SUMER 5-day observations. Due to the continuous contact can possibly be adjusted. * July 21 (TBC) HERSCHEL sounding rocket launch, CDS/EIT/LASCO/UVCS/STEREO/TRACE POC: Dan Moses, Lucia Abbo HERSCHEL has successfully passed all per-launch testing, and has requested launch time July 21 at 19:10 UT, but the time remains TBC. The time is chosen for good coordination opportunities with observations in conjunction with the July 22 Solar eclipse. The rocket payload consists of a suite of 3 instruments: SCORE/Ultraviolet Coronagraph Imager (UVCI), Herschel EIT (HEIT) and Helium Coronagraph (HeCor). The HERSCHEL Sun-Earth Sub-Orbital Program is a sounding-rocket payload designed to investigate Helium coronal abundance and solar wind acceleration from a range of solar source structures by obtaining simultaneous observations of the electron, proton and Helium Solar coronae. HERSCHEL will provide the first measurements of the coronal He abundance in source regions of the solar wind, thus bringing key elements to our understanding of the Sun-Earth connections. Timing and supporting SOHO instruments remain TBC. The HERSCHEL team is currently involved in integration and test activities. The critical milestones thereof are expected to be completed by the beginning of March. The official request on the launch date will not be made until then. EIT is OK with SOHO being in submode 5. Support will be a four-filter synoptic set binned over the rocket flight timing. LASCO support will be C2 pB set orange filter binned before and after the flight time around the EIT filter set. CDS will participate, taking on-disk He I and 2nd order He II observations. Request to add CDS planner to the mailing list. TRACE hopes to support HERSCHEL sounding rocket launch, but support depends on the scheduled downtime. See also section 2b (intercalibration activities) for proposed SOHO/STEREO/TRACE/HERSCHEL cross-calibration. * Jul 22 Total Solar eclipse (around 0236 UT), EIT/LASCO, POC: J. Pasachoff, A. Sterling, L. Damé, K. Schenk Information on the eclipse itself can be found at URL http://eclipse.gsfc.nasa.gov/SEpubs/20090722/TP214169a.pdf. The key numbers can be found also at http://eclipse.gsfc.nasa.gov/SEmono/TSE2009/TSE2009iau/TSE2009-fig01.GIF. The external/internal contacts of Umbra occur at: U1 = 00:51:14.3 UT U2 = 00:54:28.4 UT U3 = 04:16:10.5 UT U4 = 04:19:23.9 UT Tentative DSN schedule for the eclipse date and the preceding date is as follows: Jul 21 D45 2315-0215 Jul 22 D65 0720-1120 Jul 22 D27 1830-2230 (uplink) Jul 22 D15 1830-2230 (downlink) The week has not been negotiated and there is no guarantee that the passes remain as is. Unless the DSN supports change, SOHO will not be able to be in contact during the eclipse. SOCs will attempt to obtain DSN support better covering the eclipse. Jay Pasachoff's, Alphone Sterling's and Damé/Koutchmy/Kuzin/Nagnibeda expeditions will observe the eclipse from Tianhuangping (vicinity of Hangzhou), China. Mid-eclipse time will be at 01:36 UT. The team would like to have a full set of EIT and LASCO images, one of each type, as close as possible to that time and repeating as often as possible +/- 3 min from mid-eclipse, if it is possible to get more than one image during our totality (which is probably not possible). EIT/LASCO acknowledges the support requests and will support. Details of support remain TBD --- EIT and LASCO will produce the observation timeline approximately 10 days prior to launch. The plan is to support all totality timings while also adjusting if needed for EIT instrument safety during DSN contact outage. EIT may not move its sector wheel for a 4 filter sequence while in a DSN gap with longer than 2 h until contact. SOHO web pages for this eclipse will be set up in June 2009 and linked from http://sohowww.nascom.nasa.gov/operations/operations.html. * Jul 28 (TBC) SUMI sounding rocket launch, CDS/MDI/TRACE, TBC POC: Jonathan Cirtain (TBC) The launch date is approximately a week into the Aug 2009 keyhole, which very likely will restrict MDI and SUMER supports. SUMI will provide a support request soon --- possibly by mid-June. Based on information from the SUMI POC, full-disk magnetograms seem to be the baseline request with high-res observations if feasible and a suitable target is in MDI high-res field-of-view. Due to the keyhole conditions the timing of SUMI observations is relevant even for the full-disk magnetogram supports. TRACE has been asked to support this rocket launch. * Sep 23-Oct 9 Coordinated campaign with THEMIS, POC: Brigitte Schmieder Coordinated observations between SOHO instruments during observations at the THEMIS vector magnetograph are proposed. JOPs 157 and 178 are the proposed observing programs, but the descriptions will need to be updated. At least CDS, EIT and SUMER are mentioned in the current JOP descriptions. Timing remains TBC. MDI has been in touch with the POC re: supporting with full-disk observations. Full-disk magnetograms seem to be sufficient, but it may be possible after Sep 30 to do High Resolution observations if the JOP's require MDI to do so. * Sep 30-Dec TBD TRACE not performing science operations * Oct 8 (TBD) EIT shutterless #37 run 1 * Oct 15 (TBD) EIT shutterless #37 run 2 * Jan 7 (TBD) EIT shutterless #38 run 1 * Jan 15 (TBD) EIT shutterless #38 run 2 b) Intercalibration activities Last ICAL was: May 21 ICALs are normally performed monthly. Below is a SOC proposal for ICAL weeks for the next six months. Baseline will be to schedule it for Thursday during contact. * Jun 15-19 ICAL01 (#7113), CDS/EIT/STEREO/Hinode-EIS(TBD)/Hinode-SOT(TBD) The Sunrise balloon flight period may need to be taken into account in scheduling. * Jul 13-17 ICAL01 (#7113), CDS/EIT/STEREO/Hinode-EIS(TBD)/Hinode-SOT(TBD) * July 21 (TBC) ICAL14 SOHO-STEREO-TRACE-HERSCHEL radiometric cross-calibration (TBC), EIT/LASCO/UVCS/STEREO/TRACE/HERSCHEL, POC: Lucia Abbo A radiometric cross-calibration between SOHO, STEREO, TRACE and the HERSCHEL sounding rocket has been proposed. A preliminary draft of the ICAL proposal can be found at http://sohowww.nascom.nasa.gov/soc/JOPs/ical014-draft.pdf. TRACE hopes to support HERSCHEL sounding rocket launch, but support depends on the scheduled downtime. * Aug 17-21 ICAL01 (#7113), CDS/EIT/STEREO/Hinode-EIS(TBD)/Hinode-SOT(TBD) NOTE: the Aug 2009 keyhole ends on 20 Aug 2009, hence this run should be possible during the proposed time, but may also be postponed to the following week. * Sep 14-18 ICAL01 (#7113), CDS/EIT/STEREO/Hinode-EIS(TBD)/Hinode-SOT(TBD) * Oct 12-16 ICAL01 (#7113), CDS/EIT/STEREO/Hinode-EIS(TBD)/Hinode-SOT(TBD) * Nov 16-20 ICAL01 (#7113), CDS/EIT/STEREO/Hinode-EIS(TBD)/Hinode-SOT(TBD) Proposed compiled ICAL scheduling criteria, constraints and guidelines (see also campaign #7113): 1) EIT/CDS are the primary participating instruments 2) STEREO-EUVI observations are included when possible. ICALs are attempted to be scheduled not to coincide with STEREO manoeuvres or other interruptions in observations (see http://stereo-ssc.nascom.nasa.gov/plans.shtml). 3) EIT: ICALs OK at all other times except the weeks of shutterless 4) Dates, details and confirmation will be determined by the planners with support from the SOHO SOCs. 5) Neither Hinode-SOT nor Hinode-XRT have current interest in participating in ICALs. Hinode-EIS will from time-to-time perform its sensitivity calibration exercise, but has no need to perform this regularly as part of the SOHO ICAL. When it is convenient for Hinode-EIS (given Hinode's constraints), SOHO will be informed ahead of time of when the sensitivity calibration is to be performed. It will then be up to SOHO whether to follow Hinode-EIS' pointing and timing. CDS OK. If Hinode-EIS can suggest convenient date & time, CDS can usually accommodate. c) Individual instrument plans MDI: See section 2a for MDI continuous contact periods. MDI may reduce the ALT cadence during Keyholes to be less than 15 ALT magnetograms per day if the lack of high rate telemetry is such that we will lose all or almost all of the 15 ALT Magnetograms each day. The ALT cadence will be decided on an individual Keyhole basis and even a daily basis during each Keyhole depending on the 70 m antenna availability at the time. MDI may also down-link select magnetograms in the 5 kbps telemetry if no 70 m passes are available at least every 2 days for Mag dump in the 160 kbps telemetry. All requests for MDI support need to be made several months ahead of time and sent to mdi-ops(at)mdisas.nascom.nasa.gov. Even outside keyholes, MDI can only do 1-minute cadence observations when we have contact and there is no recorder dump in progress. MDI's REQUEST page is at http://mdisas.nascom.nasa.gov/coordination.txt NOTE: Listing of a study on that page means *only* that a request has been received, not that it will necessarily be supported. A description of MDI Observing Modes most used for JOPs and campaigns (FD vs. HR) can be found at http://mdisas.nascom.nasa.gov/Collaborate. Anyone requesting MDI observations is encouraged to read this page in order to have a better idea of what observing modes would be best suited for a particular study. More detailed information about how MDI operates, observational constraints and telemetry information can be found at http://mdisas.nascom.nasa.gov/MDI_Collaboration_Details. MDI has switched to Focus 5 (best focus for full-disk observing) on Oct 23, 2008. MDI will do Full Disk Velocity observations for March and September 2009. These FD Velocity observations are reserved specifically to collaborate with Hinode-SOT. MDI also reserves the March (28-30) continuous contact for FD Helioseimology studies with Hinode-SOT. First, is there an update to the DSN impact due to the LRO launch scheduled for June 17? How many days can we expect to lose DSN support from Canberra (just June 17 or whatever day they launch?). If the launch slips, will the FOT rewrite the pass plan for a given day to recover MDI high rate for Canberra passes? Or will we just lose Canberra passes each day even if LRO doesn't launch? MDI would like to put in a formal request to get 70m antenna support for at least two of the upcoming 180 degree rolls during Keyholes. MDI would like to use one roll to observe in VC2 (or "high rate") in Full Disk mode taking FD Dopplergrams and Continuum images. MDI would then like to observe in VC2 (high rate data) during a second roll (during another Keyhole) to conduct a jitter test. Both of these requests need VC2 data for about and hour. We should get these requests in to DSN asap if the various SOHO parties are OK with these two requests. UVCS: For weekly plans, see the SOHO calendar and the UVCS planning page: http://www.cfa.harvard.edu/uvcs/observations/obst.html. CDS: For details see http://solar.bnsc.rl.ac.uk/scientificops/request.shtml. EIT/LASCO: EIT: 195 A CME watch plus synoptics at 6-hour cadence, as usual. Full-res CME watch whenever we're in submode 6. Hope never to change until the Bogart mission. EIT and LASCO will perform the annual full calibration set June 8-12, 2009. These calibrations take approximately 3 days while in submode 6 during normal daytime DSN passes. The calibrations can also be carried out in submode 5, albeit taking longer to complete. Sunrise has priority and the calibration dates can be changed while still in MDI continuous DSN coverage through July 21. SUMER: See section 2a for details. SUMER has plans for another campaign after SDO commissioning. Dates are still TBD. TRACE: NOTE that TRACE in general reserves the right to withdraw support from agreed, existing collaborations if a sufficiently "good active region" is called by the Max Millennium group. For TRACE summer eclipse season see section 1f. TRACE will not perform science operations from May 15 - July 20, and from September 30 through early December. See also http://chippewa.nascom.nasa.gov/TRACE/ops/timeline/monthly_plan/current_plan.txt.
3. Any other business
* Tentative SPWG meeting times for next six months (only the next one will be decided in this meeting). Meetings take place as a baseline on Fridays after the daily and weekly meetings. Jun 19 Jul 24 Aug 21 Sep 25 Oct 30 Nov 20 The rest are FYI items: * In the future SOHO's DSN contacts will grow shorter as we lose 26-m antenna support and other, new missions get higher priority. The instrument teams are therefore requested to look at the NRT commanding that is done (especially for emergencies and recoveries) and see what can be converted into TSTOLs that the FOT can run (even without explicit instrument or SOC direction). * MDI high-rate support requests: no change, see URL http://sohowww.nascom.nasa.gov/operations/SPWG/spwg-20080118.html * DSN support requests: preferably at least 6 months in advance. Keep this in mind for: ground-based collaborations that require MDI support, stellar/shutterless observations that require NRT, etc. * Future Mercury and Venus transits: no change, see URL http://sohowww.nascom.nasa.gov/operations/SPWG/spwg-20080118.html * Hinode operational and planning information and guidelines: no change, see URL http://sohowww.nascom.nasa.gov/operations/SPWG/spwg-20080118.html and http://sohowww.nascom.nasa.gov/soc/JOPs/jop-submit.html * STEREO operational and planning information: no change, see URL http://sohowww.nascom.nasa.gov/operations/SPWG/spwg-20080118.html * The SOHO JOP/ICAL database and the web pages are now the Solar JOP/ICAL database and web pages. This is due to anticipated increased contributions by and collaborations as well as intercalibrations with STEREO and Hinode. * New JOP vs. modified existing JOP rules-of-thumb: no change, see URL http://sohowww.nascom.nasa.gov/operations/SPWG/spwg-20080118.html * SOHO calendar email notifications: no change, see URL http://sohowww.nascom.nasa.gov/operations/SPWG/spwg-20080118.html