27 May 2023 - Mission Day: 10039 - DOY: 147
Science Operations


1. Boundary conditions

a) Orbit, attitude and manoeuvres

- SOHO is in normal roll (0 deg) position

- manoeuvres

  May 29        roll, stationkeeping and momentum management (timing TBC)

  Aug 28        stationkeeping and momentum management
  Aug 30 or 31  roll (timing TBC)

b) Communications with the spacecraft

  Graphical DSN schedule: http://soho.nascom.nasa.gov/soc/dsn/

* May 18-Jun 5  26 m keyhole
* May 22-May 31 34 m keyhole

* Aug 11-Sep 9  26 m keyhole
* Aug 19-Sep 2  34 m keyhole

- The need and approach to reduce FOT manpower requirements needed for
  complex operations during the keyhole remains in effect until further 

  All available keyhole information is at

c) KNOWN submode dependent activities/submode changes:

* TOO           JOP153/MMOP003 Future Major Flare Watch (SM5 if SUMER
                observes target, SM6 otherwise)
* May 4-17      SOHO/STEREO Campaign, EIT/MDI/STEREO-EUVI
* May 9,16      EIT Shutterless #27, TBC

- Some of the default SUMER campaign dates overlap with keyholes -
  which is not a problem in itself (submode 5 will often be needed for
  keyholes anyhow) as long as potential periods of no SUMER data
  between passes can be accepted.

- 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

d) Instrument maintenance activities

   EIT bakeout periods will be during keyholes.  Dates and times are
   defined when the DSN schedules become available.

e) Others

  TRACE will have a summer eclipse season from about 12 May - 16 Jul (dates
  are TBC).

  Hinode eclipse season 7 May - 10 Aug.

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 (#8007)

  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. As
  long as the spacecraft is in submode 6, all EIT CME watch will be in full
  res.  Major Flare Watches will be in full-res even if it requires a
  submode change, unless the target is observed by SUMER.

  The relevance and continuation (whether the originators have
  enough/alternate data) of these campaigns (except perhaps for RHESSI) is
  under review.

* Apr 26-29     MDI Continuous Contact

  Default plan is full disk Magnetograms and Dopplergrams.

* May 04-May 17 JOP187 Stereoscopic Observations of Coronal Structures 
                  (#7233), EIT/STEREO-EUVI/CDS/MDI/TRACE/Hinodes-EIS/
                  Hinode-SOT, POC: William Thompson & Simon Plunkett

  STEREO SECCHI requests synoptic EIT & LASCO data and prefers EIT to be
  obtaining full-resolution images. The SUMER/EIS campaign will take place
  in March and April to avoid EIT/SUMER submode conflict (i.e., allow SOHO
  to be in submode 6 during this campaign).

  SECCHI has also expressed interest in having Hinode to also join in the
  campaign (Hinode participation is TBC).

  The timing of this campaign is driven by the desire to conduct it when
  the STEREO spacecraft separation angle is in the range 7-10 degrees, but
  the timing is also constrained by the beginning of SOHO keyhole period on
  18 May.  The separation angle on May 4 is 6.5 degrees (and is acceptable
  to SECCHI). Timing remains TBC.

  EIT science planner through May 12 is Joe Gurman; May 13 - 17, Jack

  Description of JOP 187 ("Stereoscopic Observations of Coronal
  Structures"; http://sohowww.nascom.nasa.gov/soc/JOPs/jop187.pdf) has been
  drafted by Simon Plunkett.

  Still TBD, if the shutterless run #27 on May 9 will be included.

  MDI has also been asked to participate in this coordination for 4-17 May.
  Full disk, 1 minute cadence Magnetograms or high resolution, 1 minute
  cadence Magnetograms and Continuum images have been requested.  MDI can
  support either 4-17 May or 7-18 May (keep in mind that a keyhole period
  starts 18 May).

  CDS sequences have been outlined - the CDS planner will select studies
  depending on the STEREO sequence and available targets.

  TRACE will be supporting these observations.

  Comment from Simon Plunkett: Hinode-EIS will conduct raster scans in a
  set of lines selected to cover a broad range of temperatures. I am still
  awaiting final details on what Hinode-SOT will be able to do. They will
  be in eclipse season, and it is unclear how this will affect their
  observations. I believe SOHO and TRACE can respond faster than Hinode to
  changes in target, so I suggest that Hinode should drive the target
  selection. STEREO will make full-disk observations.

* May 9, 15     EIT Shutterless #27, EIT/STEREO-SECCHI (TBD),
                POC (SECCHI): William Thompson

  Segment 1

  Wednesday May 9, 2007 DSS-27 16:50-00:00 UT; run time 19:00-21:40 UT

  Segment 2  (notice date change)

  Tuesday May 15, 2007 DSS-27 14:10-23:45 UT; run time 19:00-21:40 UT

  There may be SOHO/STEREO-SECCHI collaboration on one or both of the runs,
  still TBC.

* May 7-20      Exceptional Ulysses Quadrature observations, UVCS/CDS/EIT/
                  POCs: Giannina Poletto, Giulio Del Zanna

  The quadrature angle on May 14 is 55 degrees below the equator at west
  limb (position angle of 215 degrees).

  For additional and more detailed information on the quadrature, see also
  section 2c/UVCS.

  The observations consist of two parts:
  1) May 7-11/18-20, coordinated observations with Hinode,

     Observations are conditional on an active region being at the limb to
     obtain electron temperature, density, chemical abundance, and
     ionization state of the plasma as function of height.

     If no suitable AR is available in the SW quadrant, but there is one in
     the SE limb, the connection with Ulysses will be missed and
     observations targeted to SE.

     EIT's support with synoptic images and CME watch will be sufficient.
     Provisional support from CDS, details are under discussion.

     The POC has confirmation from Hinode that the off-limb campaign is
     still scheduled, but not clear yet exactly when and which days.  For
     next week, Hinode is going to follow the 'Del Zanna' active region
     that is now near the East limb and will be at the West limb when the
     campaign starts.

  2) May 12-17, observations with radio scintillation measurements, 

     The IPS observations will occurr on 12/14/15/16/17 May.  STEREO
     will support, but details are to be worked out.  LASCO has been
     contacted and plans to support.

* Jul 3-8       JOP178 Filament and its Environment (TBC)/
                   JOP157 Bright points in active regions (TBC),
                   SOHO/THEMIS, POC: Brigitte Schmieder

  Proposal for consideration from the POC. JOP157 would be used, if a target
  of opportunity appears. SOHO supports are solicited.

* Jun 13-17     MDI Continuous Contact, TBC

  Current default plan is full disk magnetograms and dopplergrams.  Timing

* Jul 18-22     MDI Continuous Contact, TBC

  Default campaign is full disk, 1 minute cadence magnetograms and

* Aug 5-18      Filament/Cavity-CME-ICME IHY-CIP campaign, 
                  SOLARC/ProMag/MWA/RHESSI, POC: Terry Kucera

  As part of the International Heliophysical Year (IHY), we propose an
  observing campaign in the time interval August 5-18, 2007 which will
  follow a targetted filament from East to West limb, in order to study its
  morphology, evolution and activation, and quantify its magnetic and
  plasma properties. Our study will be greatly enhanced should the filament
  erupt as a CME, and if it does, we will also examine in situ observations
  in order to link any pertinent ICME and magnetic cloud observations to
  their filament source.

  CDS has not heard from the POC yet, but is likely to participate in some

  MDI inquired, whether its support is solicited.

* Sep 10-Nov 11 MDI 60-day Continuous Contact (TBC)

  DSN schedule is not yet known (see section 1b).  MDI will run 1 min
  cadence, full disk magnetograms and dopplergrams.

* Oct 22-Nov 4  Active region morphology studies (TBC), SUMER/VTT/
                  HINODE (TBC)/TRACE/STEREO

b) Intercalibration activities

  Last Intercal 1: 25 April 2007

* May 14-18     ICAL01 (#7113), CDS/EIT, TBC

  Details and confirmation will be determined by the planners. New date
  will need to be determined, as shutterless 27's segment 2 takes place on
  15 May.

  EIT: ICALs are OK except (usually) during the weeks of shutterless.

  Comment from CDS: Would it be useful to run ICAL when SECCHI runs its
  'all wavelengths' programme?

c) Individual instrument plans


  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 downlink 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 is back in focus 5, best focus for full-disk observing.

      Notice concerning availability of SOHO/MDI data:

      The hardware supporting the MDI data archive at Stanford University
      will be relocated during the week of 28 April through 6 May,
      2007. During part of that time it will not be possible to retrieve
      data from the Stanford Helioseismology Archive, including most MDI
      data, either directly or through the VSO. We do not expect the system
      to be unavailable for the whole week, but data users should be aware
      of the possibility of such an interruption of service, and plan

      Rick Bogart, MDI Data Scientist


  We have been using the LyA detector for some observations and will keep
  planning so when appropriate.

  For weekly plans, see the SOHO calendar and the UVCS planning page:

  A document from Steve Suess and Giannina Poletto discussing the
  Ulysses-SOHO quadrature geometry is available from Michael Uzzo and also
  at http://sohowww.nascom.nasa.gov/soc/UlyPosAng2007-2008.pdf.


  For details see http://solar.bnsc.rl.ac.uk/scientificops/request.shtml.

  Given the extended duration of the Ulysses-SOHO quadrature, CDS will
  carry out several observations at a convenient date selected at a
  relatively short notice.


  EIT: 195 A CME watch plus synoptics at 6-hour cadence, as usual. Full-res
  CME watch whenever we're in submode 6.


  There are tentative plans for a campaign from Oct 22 to Nov 4, working
  title "Active region morphology studies, joint observations of SUMER,
  VTT, HINODE, TRACE, STEREO". HINODE participation is still TBC.  Despite
  the substantial photon load accumulated during the recent SOHO-HINODE
  campaign the remaining detector is still doing fine.


  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 1e.

3. Any other business

* Next SPWG:

  Friday 25 May after daily & weekly meetings

  EIT:      No comment
  CDS:      No comment
  MDI:      Either
  SUMER:    No comment
  TRACE:    Either
  UVCS:     Either

The rest are FYI items:

* If anyone has projects that require high rate (i.e. 1 minute cadence) MDI
  support, now is a good time to ask!  If you need MDI data, make sure you
  request it specifically.  There is no significant change in the shutter
  performance over the last 10 months; monitoring continues, but no
  immediate changes in operations are planned.

* DSN support should be requested 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: SOC is requesting the Flight Dynamics
  Facility (FDF) to provide estimates and data for not only disk, but also
  for coronal transits.  For this purpose FDF needs a criterion
  (radial/angular distance from Solar disk centre) to define the coronal
  transits.  Currently FDF has been instructed to use
  SOHO/Sun/[Mercury,Venus] angle of (35 arcmin (from centre of Solar disk)
  as criterion.  Instrument teams are requested to provide the SOC with
  information on whether a larger angle is applicable.

* Hinode operational and planning information can be found from

* STEREO operational and planning information can be found via 
  http://stereo-ssc.nascom.nasa.gov/, more specifically from 

* 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.

* To provide more unambiguous identification, individual instruments on
  board spacecraft other than SOHO will be as of this SPWG be referred to
  with notation SPACECRAFT-INSTRUMENT, for example Hinode-EIS.

* The Project Scientist has decided that submission of the Inputs to the
  Activity Plan (IAPs) will change to be voluntary.  The PS has informed
  the SOHO community of the change on 22 Feb by e-mail.

* The FOT will begin testing the automation procedures on the week
  beginning 19 March. The passes will continue to be manned until after an
  operational readiness review and both agencies agree to a change in the
  mission management plan, both of which won't be for at least a couple of
  months, after we have significant experience with the automation.

* New JOP vs. modified existing JOP rules-of-thumb: New JOP, if/when
  scientifically or qualitatively new type of a coordination is set up;
  modified JOP, when the investigation (the foci or targets thereof)
  remains essentially the same but new instruments/spacecraft/GBOs/etc are
  brought to bear.

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