JOP153 Major Flare Watch
Version 0, 25 February 2002
Version 0.25, 26 February 2002
SOHO & TRACE instruments: CDS/EIT/LASCO/SUMER/MDI/UVCS/TRACE
for other spacecraft and ground based observatories.
The scientific objective, justification, target selection, and
individual instruments' observation strategies for this JOP
is described in the Max Millennium
Observing Plan 003, "Region Likely to Produce Major Flares".
Purpose of this JOP description
Here we will briefly outline the response of SOHO instruments &
TRACE when a Major Flare Watch is called by the Max Millennium Chief
Observer, in order to point out the constraints and response times that
can be expected.
1 Initial contact One of the SOHO Science Operations
Coordinators will be the point of contact for SOHO & TRACE if a
Major Flare Watch is called outside of normal business hours (Goddard
time). During normal business hours, the usual email Major Flare Watch
notification is considered sufficient, but the SOCs will still make
sure individual teams have been notified.
2 Instrument team notifications
Note that changing an instrument's observation plans is contingent
upon DSN contacts and personnell constraints.
- TRACE will be notified, any time, to ensure they are running an
appropriate observation program.
- EIT/LASCO is notified, any time, to ensure they are running an
appropriate observation program.
- MDI will be notified during normal working hours (including
weekends). If the HESSI target is outside the MDI high resolution
field of view, the MDI observing program will be set to a full
disk magnetic campaign if needed. If the target is completely
inside the MDI high resolution field of view, MDI will switch to a
high resolution magnetic campaign if needed when not in
Dynamics. During MDI Dynamics periods, the MDI instrument will
make full disk doppler and magnetic field measurements and will
not switch observing programs. Campaign data is only available
during periods with VC2/VC3 telemetry.
- UVCS will be notified between 8am to 10pm GSFC time, but only if
the active region(s) in question is closer to limb than 64 degrees
east or west.
- CDS will be notified during normal working hours. They may change
or interrupt their observing plan, depending on the priority of
their existing plan (collaborations, instrument monitoring etc).
- SUMER will be notified during normal working hours,
if the instrument is currently observing.
3 Telemetry Submode Changes
SOHO's science telemetry is normally in one of two submodes:
If SUMER is observing at the time of a Major Flare Watch, but cannot
observe the Major Flare Watch target, they will accept a change to
Submode 6. However, submode changes have a number of operational
implications, and have to be planned carefully with respect to
personnell, telemetry and commanding, and safety constraints:
- Submode 6 is used if SUMER is not observing. EIT/LASCO are given
SUMER's science telemetry quota, allowing EIT to do full resolution
CME watch with 12 minute cadence.
- Submode 5 is used if SUMER is observing, using their science telemetry
quota for themselves. In that case, EIT's CME watch has to be done
with half resolution images to avoid congestion. EIT's synoptic sets
(four sets per day of 171/195/284/304) are still at full resolution.
The above points involve a number of operations and science planning
personnell. Therefore, submode changes can only be done on a "best
effort basis", with planning and execution during regular working
- The CDS command and data handling sybsystem (CDHS) may hang as a
result of a submode change. The chances are smaller when the
instrument is idle; therefore they must upload a plan with an
idle time window for the submode switch.
- In case of a CDS CDHS hang, they
must be given sufficient commanding time within
a few hours to avoid a thermal reconfiguration. This must be
taken into account in the scheduling of both submode switches.
- SUMER must command their instrument into an idle mode before
giving up telemetry, and send new commands to resume observations
after getting telemetry back.
- EIT/LASCO must make and upload new plans to take advantage of the
increased telemetry, and new plans to go back to half-resolution
CME watch when switching to the lower rate.
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Last modification: Tuesday, 26-Feb-2002 13:43:39 EST