OPERATIONS
Science Operations
FINAL MINUTES FOR SOHO 20 FEB 2009 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:
May 12 (TBC) station-keeping, momentum management, roll (to approximately
180 degrees)
Aug 11 (TBC) station-keeping and momentum management
Aug 13 (TBC) roll (to approximately 0 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):
* Jan 25-Feb 21 26m Keyhole
* Feb 1-14 34m Keyhole
* Apr 28-May 16 26m Keyhole
* May 02-12 34m Keyhole
* Jul 22-Aug 20 26m Keyhole
* Jul 29-Aug 13 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 Oct 31,
2009 (TBC). 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)
* Mar 27, Apr 2 EIT Shutterless #35 (SM6)
* Apr 15-29 SUMER campaign (SM5)
* Jun 1-Jul 10 Sunrise 5-day balloon flight
SUMER campaign dates may overlap with keyholes. Such overlaps shall be
scheduled only if periods of no SUMER data between passes are acceptable.
Shutterless run #35 moved to allow SUMER to support the SUMI rocket flight
during the SUMER spring observing campaign. For details see section 2a.
SUMER preparatory and campaign ending activities related to the Apr 15-29
campaign are proposed to be scheduled as follows:
Submode change 6->5 on Apr 13 or early on Apr 14.
Door opening on Apr 13 or early on Apr 14.
SUMER operational on Apr 15.
Door closing late on Apr 30.
Submode change 5->6 on May 1.
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. For submode change plan see the Sunrise entry in
section 2a below.
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. The bake-out period during
the Feb 2009 keyhole took place Feb 7-13.
TRACE annealing took place Feb 16-20.
e) Spacecraft maintenance activities
Reduction of PLM heaters was successfully completed.
Jean-Philippe Olive is in the process of contacting all teams about the
instruments' heaters. This relates to future optimization of thermal
control and electric power supply.
f) Others
TRACE eclipse season began on 13 Sep 2008 and will be ongoing, except for
the following predicted non-eclipse periods in 2009:
Mar 7 -- Apr 29
Jul 28 -- Sep 9
TRACE will not perform science operations from May 15 - July 12, 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.
* Feb 27-28 JOP 216/HOP 98 Multi-wavelength Observations of Oscillations
in Polar Plumes,
CDS/Hinode-EIS/Hinode-SOT/Hinode-XRT/STEREO/TRACE
POC: J. McLaughlin
Campaign starts at 18:00 UT (day one)
[Lifetime campaign] 18:00 UT (day one) - 00:00 UT (day two)
[Hign Cadence campaign] 00:00 UT (day two) - 02:00 UT (day two)
[Lifetime campaign resumes] 02:00 UT (day two) - 02:00 UT (day three).
Campaign ends at 02:00 UT (day three)
Total observing time = 32 hrs
Timing of the high cadence part of the campaign remains TBC.
* Mar 8 Daylight Savings Time begins in the USA,
change in GSFC at 07 UT
* Mar 20 (TBC) HERSCHEL sounding rocket launch,
CDS/EIT/LASCO/UVCS/STEREO/TRACE
POC: Dan Moses, Lucia Abbo
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.
LASCO will support with (3) polarized image sets in 60, 0, and -60
degrees at launch time.
CDS will participate, taking on-disk He I and 2nd order He II
observations. Request to add CDS planner to the mailing list.
See also section 2b (intercalibration activities) for proposed
SOHO/STEREO/TRACE/HERSCHEL cross-calibration.
* Mar 25-30 MDI Continuous Contact (TBC)
Note "End-of-pass handling during MDI continuous contact periods" in
section 1b.
Default observation program is full-disk, 1-min cadence magnetograms and
dopplergrams.
* Mar 27 EIT shutterless #35 run 1, EIT/CDS/MDI/TRACE/STEREO,
POC: Susanna Parenti
DSS-27 15:20-23:25 (MDI continuous). Exact times TBD.
Run 2 is planned for Apr 2.
MDI will support with full disk, 1-min cadence magnetograms and
dopplergrams.
This shutterless is planned to be part of and support JOP 216.
* Mar 29 Daylight Savings Time begins in European Union at 01 UT
* Apr 2 EIT shutterless #35 run 2, EIT/CDS/MDI/TRACE/STEREO,
POC: Susanna Parenti
DSS-27 18:55-0535
DSS-46 23:35-0535
Exact times TBD.
MDI will support with full disk, 1-min cadence magnetograms and
dopplergrams.
This shutterless is planned to be part of and support JOP 216.
* Apr 15-29 SUMER-Hinode Campaign,
POC: Davina Innes-Markiewicz
The campaign dates have been confirmed by the Hinode Science Schedule
Coordinators. An advanced plan is available under the planning web site:
http://www.mps.mpg.de/services/campaignplanner/planning/campaign-200904/index.cgi?print=no
(Click on schedule - observer)
All participants are requested to check the planning web-site given above
and to complete missing ops details (if any). The web site is
password-protected, contact the campaign POC or the SOHO SOCs for access.
For information on SUMER preparatory and campaign ending activities see
section 1c above.
The number of HOPs/JOPs can not increase anymore, since the campaign time
is almost fully booked. Given the interest in the community to
participate in campaigns such as this one, SUMER may consider to expand
the June activities (see below) or to consider a third campaign in
November 2009.
TRACE has not received any requests from JOP 214 & awaits date and
program information.
CDS requests to be added to the mailing list to receive information
(including pointing coordinates) for all JOPs.
Joint Observation Programs (JOPs) proposed for this campaign are
listed below in JOP number order.
178 Filament and its environment (footpoints and filament channel)
195 Characterization of fast and slow solar wind source regions
207 Eruptive and quiescent prominences Atlas with SOHO and Hinode
210 Checking the possible drivers of solar wind origin in
the coronal hole
214 Quiescent prominence structure and dynamics with Hinode
215 Connection between the magnetic canopy and chromospheric/lower
TR dynamics
218 Dynamics and structure of the solar atmosphere from SUMER
and VTT observations
217 Velocity fields at the base of polar coronal holes
219 Connection between photospheric vortex flows and transition
region and coronal heating
Comprehensive descriptions can be found on the Solar JOPs web page
http://sohowww.nascom.nasa.gov/soc/JOPs/, compact descriptions (SOHO
calendar entries) are shown below in order of their run dates.
* Apr 16 SUMI sounding rocket launch, CDS/MDI/SUMER, TBC
(SUMER-Hinode campaign program ID 10),
POC: Jonathan Cirtain, John Davis (TBC)
SUMI team is concerned about the level of solar activity or rather the
lack of activity. The decision to attempt launch in April or to postpone
the launch (tentatively to July) will be made at the end of
March. Combining the SUMI launch activities with the Sunrise balloon
activities is a possibility.
CDS can participate on April 16. If the launch is delayed, 5 hours on
April 17 are allocated to another observation with Hinode and SUMER.
MDI needs to know what observations (full-disk or high resolution) are
needed for the SUMI rocket launch.
* Apr 16-28 JOP 214 Quiescent prominence structure and dynamics with
Hinode-SOT,
SUMER/UVCS/Hinode-EIS/Hinode-SOT/Hinode-XRT/STEREO/TRACE,
(SUMER-Hinode campaign program ID 6),
POC: Tom Berger
Currently scheduled to run on Apr 16, 18, 21, 23-24, 26, 28. For details
see the campaign web site.
* Apr 16-28 JOP 215 Connection between the magnetic canopy and
chromospheric/lower transition region dynamics,
SUMER/MDI/VTT,
(SUMER-Hinode campaign program ID 7),
POC: Anna Pietarila,
Currently scheduled to run on Apr 16, 18-19, 21-28. For details see the
campaign web site.
HR observations specifically, hr_ve_fe_me, is requested from
MDI. However, the JOP description indicates the MDI data is for
coalignment, so would MDI synoptic HR images would be sufficient? Will
coordinate with JOP POC, but MDI may be in HR mode anyway for another
SUMER/Hinode JOP.
* Apr 17, 20 JOP 218 Dynamics and structure of the solar atmosphere from
SUMER and VTT observations
(SUMER-Hinode campaign program ID 20),
MDI/SUMER/TRACE/VTT
POC: L. Teriaca
MDI will support with HR Magnetograms if the target is within the MDI
high resolution (HR) field of view (HRFOV).
* Apr 17, 21 JOP 195 Characterization of fast and slow solar wind
source regions
(SUMER-Hinode campaign program ID 23),
SUMER/UVCS/Hinode-EIS
POC: Enrico Landi
* Apr 18-26 JOP 219 Connection between photospheric vortex flows and
transition region and coronal heating
(SUMER-Hinode campaign program ID 1),
MDI/SUMER/Hinode-EIS/Hinode-SOT/Hinode-XRT/TRACE(TBD)/
STEREO(TBD)
POC: Davina Innes-Markiewicz
Currently scheduled to run on Apr 18, 22, 26. Requested DSN coverage for
Apr 18 obtained, Apr 22 and 26 remain TBD. For details see the campaign
web site.
MDI will support with HR Magnetograms as requested if the target is
within the MDI HRFOV.
* Apr 19, 24 JOP 210 Checking the possible drivers of solar wind origin
in the coronal hole,
SUMER/Hinode-EIS/Hinode-SOT/Hinode-XRT (all TBC),
(SUMER-Hinode campaign program ID 3),
POC: Hui Tian.
* Apr 20, 22 JOP 217 Velocity fields at the base of polar coronal holes
(SUMER-Hinode campaign program ID 19),
SUMER/Hinode-EIS/Hinode-SOT/Hinode-XRT/STEREO/TRACE
POC: L. Teriaca
* Apr 23-29 JOP 178 Filament and its environment
(footpoints and filament channel)
CDS/EIT/MDI/SUMER/Hinode/TRACE/Udaipur/Nainintal/
Hida/Bialkow/Ondrejev/Meudon/THEMIS (all TBC)
(SUMER-Hinode campaign program ID 8),
POC: Brigitte Schmieder
JOP 178 may use the same target as JOP 214, if convenient.
MDI has not gotten a formal request to support this, but as long as it
does not conflict with JOP's 219/218/215 then MDI can support JOP178. If
MDI is running in HR mode, though, on any given day for another JOP and
JOP178 wants us to switch to FD, we will not do so on timescales less
than 24 hours.
TRACE has not received a request to support this JOP.
* Apr 23, 29 JOP 207/HOP 82 Eruptive and quiescent prominences Atlas with
SOHO and Hinode
CDS/SUMER/Hinode-EIS/Hinode-SOT/Hinode-XRT
(SUMER-Hinode campaign program ID 16 & 17),
POC: Susanna Parenti
The two different campaign program IDs refer to two different pointings.
* May 17-Jul 21 MDI 60-day continuous contact
Timing TBC. The continuous contact period will be a 60-day period within
the dates listed above.
MDI will run a Full Disk Dopplergram and Continuum image campaign for
most of the 60 Day CC period. This is different than the last several 60
Day CC periods. We will always run Velocity observations and will
interrupt the Continuum observations during the 5 day Sunrise balloon
flight. We will not, however, run in High resolution mode, so only 1
minute cadence, FD Magnetograms and Dopplergrams will be taken during the
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 12 (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
A tentative timeline of the flight is below:
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. CDS concurs, as long as the submode
change timing allows for CDS crash recovery (if needed) and loading on
one single pass.
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.
Need for SOHO to be in record at any point for this balloon flight will
be investigated.
TRACE support is TBD (see also TRACE subsection in section 2c below).
* Jul 22 Total Solar eclipse (around 0236 UT)
Request for DSN coverage has been submitted.
b) Intercalibration activities
Last ICAL was: Jan 27
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.
* Mar 2-6 ICAL01 (#7113), CDS/EIT/STEREO/Hinode-EIS(TBD)/Hinode-SOT(TBD)
* Mar 9 (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.
* Apr 6-10 ICAL01 (#7113), CDS/EIT/STEREO/Hinode-EIS(TBD)/Hinode-SOT(TBD)
* May 11-22 ICAL01 (#7113), CDS/EIT/STEREO/Hinode-EIS(TBD)/Hinode-SOT(TBD)
* 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)
* 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.
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 has completed all necessary engineering activities required before
the Jan/Feb 2009 Keyhole.
MDI will do Full Disk Velocity observations for March and September 2009.
These FD Velocity observations are reserved specifically to collaborate
with Hinode-SOT. Currently, MDI has decided to have a joint
MDI/Hinode-SOT FD Velocity run between Feb 23-25. The Helioseismology
observations would require at least 6 hours of VC2, so the most likely
collaboration times are Feb 24 from ~01:00-07:15UT or Feb 24-25 from
~23:00-06:05UT. MDI also reserves the 5 day CC in March (25-30) for FD
Helioseimology studies with Hinode-SOT.
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.
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 12, 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. Mar 27 Apr 24 May 29 Jun 26 Jul 24 Aug 28 or 21 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
