OPERATIONS
Science Operations
FINAL MINUTES FOR SOHO 24 Oct 2008 SPWG MEETING
1. Boundary conditions
a) Orbit, attitude and manoeuvres
- SOHO is right side up (0 degrees).
- manoeuvres
To the degree possible, manoeuvres take place during the last days of
34-m keyholes. Currently proposed or set manoeuvre dates are:
Nov 18 (TBC) station-keeping, momentum management, roll
Feb 10 (TBC) station-keeping & momentum management
Feb 14 (TBC) roll
May 12 (TBC) station-keeping, momentum management, roll
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):
* Nov 05-22 26m Keyhole
* Nov 09-18 34m Keyhole
* Jan 25-Feb 21 26m Keyhole
* Feb 1-14 34m Keyhole
* Apr 28-May 16 26m Keyhole
* May 02-12 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. DSS-46 is planned to be decommissioned Aug 1,
2009. 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)
* Oct 16,28 EIT Shutterless #33 (SM6)
* Jan 15,22 EIT Shutterless #34 (SM6)
* Apr 16,23 EIT Shutterless #35 (SM6)
* Apr 2-week SUMER campaign (TBD; SM5)
SUMER campaign dates may overlap with keyholes. Such overlaps shall be
scheduled only if periods of no SUMER data between passes are acceptable.
Potential conflict between the EIT shutterless #35 and the planned Apr
2009 SUMER campaign.
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 bake-out periods will be during keyholes. Dates of the next bake-out
(Nov 2008 keyhole) remain TBD.
e) Others
TRACE eclipse season began on 13 Sep 2008.
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.
FOT is currently testing a software anomaly detection system, which will
pause NRT only when needed instead of the current regular pauses. This
approach is used in parallel with the regularly paused NRT up to the
second half of Nov 2008, after which the regular pausing of the NRT will
be discontinued.
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.
* Oct 16, 23 EIT shutterless #33, EIT/CDS/MDI/TRACE/STEREO,
POC: Susanna Parenti
Thursday October 16 2008: DSS-27 13:00-19:40 UT, runtime 15:00-17:50 UT.
Request to move SOHO SVM to 12:00 UT.
Thursday October 23 2008: DSS-27 13:00-22:05 UT, runtime 15:00-17:50 UT.
Request to move SOHO SVM to 12:00 UT.
MDI has supported segment 1 with HR observations and segment 2 with FD
observations.
* Oct 26 Daylight Savings Time ends in European Union at 01 UT
* Nov 2 Daylight Savings Time ends in the USA,
change in GSFC at 06 UT
* Dec 10-14 MDI Continuous Contact
Note "End-of-pass handling during MDI continuous contact periods" in
section 1b.
Standard full disk, 1-min cadence magnetograms and dopplergrams.
* Jan 15, 22 EIT shutterless #34,
POC: Susanna Parenti
DSN passes (and hence exact times) still TBC.
* Apr 16, 23 EIT shutterless #35,
POC: Susanna Parenti
DSN passes (and hence exact times) still TBC.
* Apr 2-week SUMER Campaign, TBC
Timing remains TBC, since negotiations with Hinode Chief Observers have
not been finished yet. SUMER also inquires about any flexibility on the
dates of shutterless #35.
CDS requests to be included on the mailings concerning these forthcoming
JOPs.
* Apr TBD JOP 210 Checking the possible drives of solar wind origin
in the coronal hole,
SUMER/Hinode-EIS/Hinode-SOT/Hinode-XRT (all TBC),
POC: Hui Tian.
Timing TBD.
* Apr TBD JOP 211 How does the solar wind originate from the
quiet-Sun region,
SUMER/Hinode-EIS/Hinode-SOT/Hinode-XRT (all TBC),
POC: Hui Tian.
Timing TBD.
* Apr TBD JOP 212 Connection between UV explosive event and
magnetic cancellation,
SUMER/Hinode-EIS/Hinode-SOT/Hinode-XRT,
POC: Hui Tian.
Timing TBD.
* Apr TBD JOP 214 Quiescent prominence structure and dynamics with Hinode and
La Palma,
SUMER/UVCS/Hinode-EIS/Hinode-SOT/Hinode-XRT/STEREO/TRACE/DOT/SST,
TBC.
POC: Tom Berger
TRACE has not received any requests from JOP 214.
b) Intercalibration activities
Last ICAL was: Oct 09
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.
* Nov 3-7 ICAL01 (#7113), CDS/EIT/STEREO/Hinode-EIS(TBD)
As per EIT's suggestion the next ICAL001 will be:
Tuesday 2008/11/04 13:55:00 - 2008/11/04 22:50:00 PASS D27
ICAL001 start time of 15:00 UT
There are no conflicting STEREO activities during the ICAL time.
* Dec 1-5 ICAL01 (#7113), CDS/EIT/STEREO/Hinode-EIS(TBD)
* Jan 5-9 ICAL01 (#7113), CDS/EIT/STEREO/Hinode-EIS(TBD)
* Jan 26-30 ICAL01 (#7113), CDS/EIT/STEREO/Hinode-EIS(TBD)
NOTE: 26-m keyhole begins on Jan 26 and 34-m keyhole
begins on Feb 1. ICAL might still be possible during this
period.
* Mar 2-6 ICAL01 (#7113), CDS/EIT/STEREO/Hinode-EIS(TBD)
* Apr 6-10 ICAL01 (#7113), CDS/EIT/STEREO/Hinode-EIS(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-EIT 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.
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.
SUMER:
See section 2a for details.
There are tentative plans for another SUMER-Hinode campaign in April
2009. To be coordinated with Hinode instrument teams.
--> #SUMER: changes, comments?
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 1e.
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. Nov 21 Confirmed Dec 19 Jan 23 Feb 20 Mar 27 Apr 24 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
