SOHO SPWG Minutes
SPWG FINAL MINUTES
Friday 27 October 2006
1. Boundary conditions
a) Orbit, attitude and manoeuvres
- SOHO is currently right side up
Dec 5 roll, stationkeeping and momentum management (timing TBC)
b) Communications with the spacecraft
Graphical DSN schedule: http://soho.nascom.nasa.gov/soc/dsn/
Madrid 70 m antenna is scheduled to be operational again as of
2 Jan 2007, possibly even earlier.
* Nov 24-Dec 11 26 m keyhole
* Nov 27-Dec 8 34 m keyhole
- The need and approach to reduce FOT manpower requirements needed for
complex operations during the keyhole remains in effect also for the
- Earliest STEREO launch date has been confirmed to be 25 Oct 2006. The
launch (including possible further delays), initial operations and
commissioning requirements may severely impact available DSN coverage for
SOHO's December keyhole.
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)
* TOO JOP175 Extended Filaments at the Limb (see sect. 2a), SM6
* Nov 8-17 SUMER campaign, SM5
* Nov 8 Transit of Mercury, SM5/6
* Nov 24-Dec 11 26 m Keyhole (Nov 27-Dec 08 34 m Keyhole), SM5/6
* Mar 13-Apr 30 SUMER/Hinode campaign, SUMER/EIS
* May 1-14 SOHO/STEREO campaign, EIT/SECCHI (dates TBC after Hinode
- 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.
- SUMER plans an engineering campaign November 8-17 and joint observations
with Hinode/EIS (see section 2a). Detector testing will be performed.
Communication with S/C experts has shown 'baking' of the detector
electronics is possible.
- EIT will support JOP 159 with 304 A observations only in the week before
bakeouts. STEREO SECCHI EUVI should supersede the need for EIT
observations of this type.
According to EIT the Mercury transit observations can be carried out in
either submode 5 or 6. EIT can only observe in one wavelength if NRT is
not available throughout the transit observations. Since SUMER does not
plan to observe the transit (section 2a), higher-resolution observations
are possible for EIT and required submode change timings need to be
agreed upon. FDF has provided the observational geometry data (see
- 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 for the December keyhole, timing TBD - will be announced as
soon as the DSN schedule information is available.
- TRACE eclipses
* Oct 5-Mar 1 TRACE winter (hard) eclipse season
2. Priorities for the coming month and more
a) Joint observing plans and campaigns
* 2002/02/25-- JOP136 Default RHESSI Collaborations (#6850),
POC: Tero Siili
* 2002/04/25-- JOP159 CMEs in Lyman-alpha (#6870), SWAN/LASCO/EIT/UVCS,
POC: Chris St Cyr, Eric Quemerais
* 2003/05/13-- Default CDS Co-observations with TRACE (#6950)
* 2004/02/19-- JOP175 Extended Filaments at the Limb (#7135),
POC: Chris St Cyr
* 2005/09/20-- JOP153/MMOP003 Future Major Flare Watch (#8006)
Campaign #6850 is for "individual instrument studies" selecting an
AR 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,
except JOP175 getting half/full-res 304 A CME watch in submode 5/6, and
Network-Internetwork Oscillations which is TBD by Scott McIntosh. 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 and the decisions will be provided at this or the next SPWG
* Oct 10-Nov 5 Mars and Venus Express Solar Conjunction,
UVCS/MEx/VEx/LASCO/EIT, POC: Mari Paz Miralles
North coronal hole pass.
LASCO continues to observe in full field and high cadence subfield
* Oct 25 STEREO launch
STEREO was successfully launched Wednesday 26 Oct 2006 at 00:52 UTC
(25 Oct 2006 at 20:52 EDT).
* Oct 25 EIT Shutterless #25, 19:00-21:40 UT, EIT/CDS/TRACE/MDI,
POC: Susanna Parenti
Main target north polar coronal hole. MDI: full-disk magnetograms and
* Oct 28 Dual sounding rocket launch for CELIAS/SEM, TIMED/SEE
and SDO/EVE cross-calibration, CELIAS/TRACE/TIMED/SDO,
POC: Andrew Jones, TBC
Most up-to-date and detailed information on the launches (e.g.,
instrument characteristics, launch windows) can be found at
This is an expanded repeat of 2005 Aug CELIAS/SEM calibration flight.
The current best information on the launch times is:
36.233US Oct. 28, 2006 at 17:58 UTC. (TIMED/SEE and SDO-EVE instruments)
36.236US Oct. 28, 2006 at 18:28 UTC. (SOHO/SEM instrument)
Backup flight date is 29 Oct (TBC), when there are primary and secondary
Primary: 36.233US at 18:15 UTC, 36.236US at 18:45 UTC
Secondary: 36.233US at 19:52 UTC, 36.236US at either 19:22 UTC or 20:22 UTC
During the time of the primary 29 Oct window SOHO will not be in contact.
The time of the secondary window is, however, during the early part of a
DSS-27 pass. The pass begins at 19:15 UTC (Beginning-of-Track). If the
launch ends up taking place during Sunday's secondary launch window, the
current plan (TBC) is for SOHO to be on record from the beginning of the
DSS-27 pass to the end of the rocket's mission, followed by VC2 and SSR
TRACE will support the launch if it takes place on 28 Oct. Launch shift
to Sunday 29 Oct will most likely not be accommodated, however.
CDS will run a full-disk spectral atlas (USUN) on Oct 28-29.
* Nov 8 Mercury Transit
The Mercury transit in November will be seen by SOHO. The SOHO visibility
information received from FDF on 14 Jul 2006 - i.e., the ingress,
greatest transit, and egress points - are summarized below:
The angular radius of the Sun as seen from SOHO will be 0.27137 deg, the
lowest SOHO/Sun/Mercury angle will be 0.1153 deg.
I. (just touching outside) = 2006/11/08 20:09:32 UTC
II. (just touching inside) = 2006/11/08 20:11:23 UTC
Greatest Transit (closest approach of the centers): 2006/11/08 22:38:43 UTC
This separation is 413.978 arc-sec
III. (just touching inside) = 2006/11/09 01:06:08 UTC
IV. (just touching outside) = 2006/11/09 01:07:59 UTC
Finally, Transit Total Duration: 4 h 58 min 27 s
The FDF-provided data for the transit in 5 min increments can be found at
http://sohowww.nascom.nasa.gov/soc/transits/mercury/20061108/ in HTML,
text and Excel formats.
All values above and in the spreadsheet are with respect to SOHO.
For summary information on the view from Earth, see
Based on current DSN schedule, EIT plans to observe the transit in all
four wavelengths, between 2006/11/08 18:45 UT and 2006/11/09 02:20 UT.
LASCO to observe Mercury through C3 and C2 fields. TBC.
MDI can observe the transit and requests SOHO not to be in record. MDI
plans to observe the entire transit and requests that the FOT stay in VC2
(except during handovers). Obtaining observations of the November 2006
Mercury transit is extremely important to MDI, specifically for solar
radius measurements. The only other Mercury transit MDI has observed is
the 2003 transit and the next Mercury transit won't be until 2016 (there
will be a Venus transit in 2012, but that is also rather far into the
future...). It is imperative that MDI get high rate observing for the
entire transit and for a few hours on either side. Knowledge on the
status on the DSN schedule for the transit (whether enough DSN been
requested for MDI to be in VC2 for ~10 h?). MDI wants VC2 for the entire
transit period (4 h 58 min 27 s) and for a few hours on either side.
TRACE will be supporting with observation for Jay Pasachoff. The transit
occurs, however, during TRACE's eclipse season (see section 1e), hence
support will depend on the exact timing and possible coincidence of the
transit and a TRACE eclipse. Current predicts show that TRACE will
likely be able to see the transit.
CDS plans are under consideration, based on the 2003 transit. The CDS
sequence will be tested on the week beginning 30 Oct.
No SUMER observations planned during Mercury transit. We will stay in
Submode 6 until 06 UT on November 9.
The SOCs have requested that SOHO is in contact during the transit, i.e.,
that SOHO has a baseline and backup DSN stations available. DSN schedule
for the transit period is expected to be available during the week
beginning 16 Oct. STEREO launch or even slight slipping thereof may
impact the DSN availability at and around the transit time.
The DSN schedule as it stands now for the transit is:
Any updates on the FDF-provided information will be
relayed to the instrument teams as soon as it becomes available.
* Nov 8-Dec 17 SUMER Campaign, SUMER/EIS, POC: Werner Curdt
Detector testing will be done Nov 8-17. See section 1c. A more detailed
testing plan has been provided by the SUMER team to the SOCs.
If Hinode commissioning and the SUMER engineering activities allow, SUMER
will try to run some co-observations with EIS. SUMER team will not
prepare a detailed plan for this, but will react and decide on short
We will be in Submode 6 until 06 UT on November 9 - consequently the
detector testing might not effectively begin until Nov 9. We will go
back to Submode 6 after the SUMER campaign is over, timing TBD.
* Nov 10-13 MDI Continuous Contact
Default plan is 1-min cadence, full disk magnetograms and dopplergrams.
MDI will be in best focus for full disk observing at this time (change
from FOC4 to FOC5).
* Dec 19-25 Ulysses-SOHO Quadrature Observations,
UVCS/CDS(TBC)/LASCO(TBC)/STELKab, POC: Giannina Poletto
The quadrature period extends until May 19, 2007.
UVCS will encourage the lead observers to take advantage of the
Ulysses-SOHO quadrature beginning this December when planning observation
programs. UVCS will schedule extra observation time devoted to this
quadrature and said schedule will be made available to the SOHO SOCs. A
document from Steve Suess and Giannina Poletto discussing the
Ulysses-SOHO quadrature geometry is available from Michael Uzzo and also
The quadrature angle will be P.A.=196 during that time (SW limb; the
position angle corresponds to 74 degrees south of the equator at the west
LASCO will provide full field pB images for this campaign.
CDS support will be considered.
* Jan 5-7 MDI Continuous Contact
Current default plan is full-disk magnetograms and dopplergrams.
* Jan 17, 24 EIT Shutterless #26, EIT (TBD)
* Feb 2-4 MDI Continuous Contact
Current default plan is full-disk magnetograms and dopplergrams.
* Mar 13-Apr 30 SUMER/Hinode campaign, SUMER/EIS, POC: Werner Curdt (TBC)
Dates will be confirmed after Hinode commissioning.
* Mar 28-Apr 1 MDI Continuous Contact
Current default plan is full-disk magnetograms and dopplergrams.
* Apr 25-29 MDI Continuous Contact
Current default plan is full disk magnetograms and dopplergrams.
* May 1-14 SOHO/STEREO campaign, EIT/SECCHI
STEREO SECCHI prefers EIT to be obtaining full-resolution images, hence
the SUMER/EIS campaign will take place already in March to avoid
EIT/SUMER submode conflict.
EIT science planner for that period still TBD (for some months). Simon
can contact Kevin and Joe in the meantime.
Still TBD, if the shutterless run #27 on May 9 will be included.
* May 9, 16 EIT Shutterless #27, EIT/SECCHI (TBD)
b) Intercalibration activities
Last Intercal 1: 11 October 2006
* Oct 30-Nov 3 ICAL01 (#7113), CDS/EIT, TBC
Details and confirmation will be determined by the planners.
Future ICALs are TBD. EIT: ICALs are OK except during the weeks of
shutterless or of the Mercury transit.
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. MDI will
stay in focus 5 indefinitely and will not do high-res observations
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:
See also the Exceptional Ulysses Quadrature (19-25 Dec 2006 and onwards
to May 2007) as well as the MEx/VEx conjunction in section 2a.
For details see http://solar.bnsc.rl.ac.uk/scientificops/request.shtml.
From mid-December 2006, CDS will begin an extensive programme of
observations in support of the first 90 days of Hinode science
operations. CDS detailed plan TBD.
LASCO reduced exposure for Mercury pre and post the transit. TBC. EIT
observations will probably cover 2006/11/08 18:45 - 11/09 02:20 UT.
See sections 1c and 2a.
NASA has announced that it plans to continue funding of TRACE operations
at close to the FY06 level through FY08, followed by a significant
ramping down of operations into FY09.
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.
3. Any other business
* Next SPWG:
Wednesday, Nov 22 after the daily and weekly meetings.
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.