SOHO SPWG Minutes
SPWG MEETING MINUTES, September 19 1997
Chair: Piet Martens (ESA/SOC)
Notes: Laura Allen (NASA/SOC)
Attendees: Andrzej Fludra (CDS), Simon Plunkett (LASCO/EIT), Giulio del Zanna
(CDS), Joe Gurman (EIT), Nat Gopalswamy (EIT), Jeff Newmark (EIT),
Julia Saba (MDI), Rock Bush (MDI), Vic Gaizauskas (HIA), Karin
Muglach (ESTEC), Vicente Domingo (Project Scientist/ESA)
Not represented: UVCS, SUMER
1. Review of action items
- None from previous meetings
- SOCs will notify campaign leaders potentially requiring MDI Hi-rate,
as early as possible of need for DSN requests at least a month in
2. Boundary conditions for the coming month
- October 1, SVM Reserved for Memory Dumps and TR Maintenance - 6 hours
- MDI Continuous: Oct. 7 at 19:25 UT to Oct. 11, 4:35 UT.
- 10-19 October Submode 3: CDS high, SUMER low.
19-27 October Submode 2: CDS low, LASCO/EIT high, SUMER low.
(Submode changes depedent upon succesful completion of submode 2 and
3 upgrades at the end of September)
3. Preview of future months
- See Monthly Calendar at
Discussion of MEDOC campaign. Desire to avoid duplicate effort and duplicate
daily meetings. We don't want daily meetings at the EOF. However, coordination
may be difficult since there are several studies: JOP066, Coronal Loops, and
Diagnostics of Heating Episodes in Active Regions which involve EIT and the
coordinator intends to be at the EOF (not MEDOC). Therefore, we would have
to have some sort of calls going back and forth. Question arose as to why we
are doing this when there are no ground-based observations involved in October.
The meeting asked the Project Scientist to convey these feelings to SWT in
Reminder of the limited DSN contact on Christmas and New Year's Days.
There may only be enough time to just dump the SSR, CDS was asked if they planned
to reduce operations during the Christmas holiday. They may want to consider a
telemetry exchange with LASCO/EIT during the 2 weeks of SUMER off, like last year.
4. Priorities for the coming month
a) Individual instrument plans
CDS - Emphemeral AR studies, CH campaign for a month (4 to 5 hours of
observations) proposed by Giulio del Zanna, supported by EISCAT
measurements. Have not heard much from EISCAT yet, they are doing
observations every day depending on the sources. Low latitude coronal
hole studies with Nobeyama (24 - 2 UT) and may shift synoptic program to
accomadate this. Running weekly coronal hole monitoring during the weekend
which will continue regularly.
During a week with CDS high telemetry will either run a wide slit movie
or raster movies on the limb (the higher rate would provide more
diagnostic lines). Perhaps some collaboration with MDI on the wide slit
movies if chosen. The wide slit movies run at a cadence of 50 or 90
seconds depending on the number of spectral lines and have quiet sun as
a target. EIT also expressed an interest in collaborating.
SUMER - No SUMER representative present.
UVCS - No UVCS representative present.
LASCO - Have EIT and HRTS calibration rockets. Have not heard much about the JOP068
which was scheduled tentatively from 29 Sept - 1 Oct; will probably not be
done. HRTS has slit 1 solar radius long (one end near the pole and one near disk
center). New JOP069 has been submitted which describes this. No sure that if the
EIT rocket slips a day, the HRTS will also.
EIT - Submitted description for their calibration rocket: Intercalibration 13.
They may offpoint the rocket and request some C2 images from LASCO, otherwise
just obtain LASCO C1. SEM also involved. Simultaneous data in He 304 from SEM.
SUMER will be near central meridian at the time.
Support JOP012/17 at beginning of October.
Also added the following, which CDS will support when they can. Other instruments
can use similar programs to support the Sac Peak collaboration as well as the
coronal hole campaign:
- October 1 -12: EIT/Sac Peak ASP/MDI/Yohkoh. EOF: Tom Metcalf
Temporal Evolution of Coronal Loops 15-23 UT.
Alex Pevtsov is scheduled to observe at NSO/SP using the Advanced Stokes
Polarimeter from October 1 through October 12, 1997 (15:00 to 23:00 UT each
day). The goal of the project ("Separator Models of Coronal Loops" by
A.A. Pevtsov and D.W. Longcope) is to study temporal evolution of non-flaring
coronal loops and photospheric magnetic fields in conjunction with the
separator model of the coronal loops. In brief, we will use ASP vector
magnetograms (2 per hour) to compute separator field lines and study their
time evolution, energy output etc. We will compare these computed separators
with the coronal loops observed by Yohkoh and by EIT/SOHO. We intend to use
such a comparison to test the adequacy of the separator theory.
The region to be observed will be selected during the campaign, but 24 hours
notice will be given. A new target may be selected each day, but the target
will remain the same throughout the day for ease of coordination with EIT and
SXT. The size of the EIT subfield should be sufficient to cover the selected
active region over the Sac Peak observing day.
Also added the following to the calendar in week 41:
- EIT/LASCO C2 observations of microjets at North Pole.
MDI -- Priority is 3 day continuous (Oct 7-11), high resolution magnetic study.
Target will be an active region if one appears in the high resolution
field-of-view. Supporting various JOPS, JOP012/17. Interested in developing
active regions and getting simultaneous magnetic and doppler measurements.
During extended mission, keeping long continuous (60-90 days) but have the
3 day continuous per month changed to 5 days (for TRACE support) and relax
when the continous can be scheduled during the month.
Will have something for the SWT next month to get support from other PIs
to make the extra DSN a "SOHO request" rather than just an MDI request.
The 1997 3 months continuous coverage was slightly less than 95%, mostly
due to some data being lost between JPL and GSFC.
b) Intercalibration activities
Intercalibration 001 has not been run, since at the last SPWG figured that
the calibration rockets were sufficient.
c) Joint observing plans
Have not received much information concerning the: 'Beginning' of October
Ephemeral Active Region Study Leader: Franz Kneer (email@example.com))
5. JOPs status
Nothing to report
6. New JOPs
JOP069 and Intercalibration 13; discussed above
SOC and MDI wanted to point out the absolute importance of DSN contact
scheduling. Laura Allen mentioned that during the HRTS rocket launch, there
was a station handover scheduled * at * the launch time. She talked to the
DSN schedulers and the handover will now be moved to ~ 20:30 UT. However,
notice is really needed a minimum of a month in advance to schedule such
things. MDI also included the following notice to be added to the minutes:
Notice to potential MDI collaborators
We remind colleagues who desire MDI support during joint observations
that we can provide only 96-minute cadence, full-disk magnetograms if
we do not have high-rate telemetry. MDI high-rate telemetry requires
(1) being in contact with the spacecraft and (2) no concurrent recording
to or dumping of the Solid State Recoder (SSR).
As competition for DSN contacts increases, it becomes even more important
than in the past that SOHO requests for DSN support are made at least
several weeks in advance, the earlier the better. This is especially
important for contact needed outside the usual period for the long contact
of the day (~1400-2400 UT), but even contact within the usual long-contact
period cannot be taken for granted.
Typically we get high-rate data about two hours after the start of the
contact; the delay depends on the length of time since we were last in
contact. On certain occasions, we can get high-rate data earlier in the
contact if the SSR dump is delayed, but delaying the dump delays receipt
of data that may be important for planning, and so must be agreed to in
advance by all the instrument teams affected.
Colleagues interested in having MDI participate in collaborative observations
should send an email message to firstname.lastname@example.org, specifying
the dates and times of the joint observations and the type of MDI observations
preferred. There should be sufficient information in the message about the
observing program and science goals that the MDI team can determine if they
can support the program given other constraints and commitments. If support
is possible, the MDI team will forward the request for the necessary DSN
contact time to the SOHO Science Operations Coordinators.
Meeting adjourned: 11:30