SOT
active region & flare observation plan
One
of the SOTfs important tasks is to precisely measure
magnetic field and velocity field configuration and their evolution, not only
during the flare, but also before and after the flare for a long time as thoroughly
as possible. Such measurements would help us to understand the physics involved in
evolution of active regions and flares.
Due
to the data telemetry limitation of Hinode spacecraft (`4000Mbits/day),
SOT cannot take high-cadence FG images, Magnetogram and SP data simultaneously
for a long time. The SOT team needs to have some standard observation sequences
dedicated to active region and flare observations, which will be mainly used when
the Hinode observatory enters gactive region & flare studyh operation mode.
Here
4 observation programs are listed up as highest priority for active region and
flare observations. By considering target size with the limited telemetry
resource, 6 observation programs are designed as the initial programs. SOT-CO chooses one
or some of these from the discussion with other COs at the planning.
·
SOT-Case1-1: Active region,
Topology – NLFF (Small)
Determine photospheric signatures of
energy storage, trigger process that leads to flares and the coronal
configurations of flare sites. The coronal magnetic field configuration is
inferred by nonlinear force-free field calculation with photospheric magnetic
field vector data. Chromospheric features can also help to infer the magnetic
field lines.
|
FOV |
Cadence |
Summing |
Compress |
SP:
fast map |
123h~123h |
90 min |
1-side |
Q65 |
FG:
Ca II H |
109h~109h |
2-3 min |
2~2 |
Q50 |
FG:
G-band |
109h~109h |
90 min |
2~2 |
Q65 |
FG:
Na D I/V |
109h~109h |
5 min |
2~2 |
|
FG:
H-alpha |
109h~109h |
90 min |
2~2 |
|
Total data volume in 24-hour operation is
3,266 (3min) – 3,578 (2min) Mbits.
·
SOT-Case1-2: Active region,
Topology – NLFF (Large)
This is a same type observation program
of SOT-Case1-1 for large active region.
|
FOV |
Cadence |
Summing |
Compress |
SP:
fast map |
164h~164h |
120-150 min |
1-side |
Q65 |
FG:
Ca II H |
164h~109h |
120-150 min |
2~2 |
Q50 |
FG:
G-band |
164h~109h |
120-150 min |
2~2 |
Q65 |
FG:
Na D I/V |
164h~164h |
10 min |
2~2 |
|
FG:
H-alpha |
164h~164h |
120-150 min |
2~2 |
|
Total data volume in 24-hour operation is
2,858 (2.5hr) – 3,515 (2hr) Mbits.
·
SOT-Case2-1: Dynamics, long
term evolution, thermodynamics (Small)
By observing long-term evolution of
active region with high cadence, determine photospheric signatures of energy
storage, trigger process that leads to flares and the coronal configuration of
flare sites. This is a same type program of Case1 without SP and H-alpha
images.
|
FOV |
Cadence |
Summing |
Compress |
FG:
Ca II H |
109h~109h |
1 min |
2~2 |
Q50 |
FG:
G-band |
109h~109h |
90 min |
2~2 |
Q65 |
FG:
Na D I/V |
109h~109h |
1 min |
2~2 |
|
Total data volume in 24-hour operation is
2,904Mbits.
·
SOT-Case2-2: Dynamics, long
term evolution, thermodynamics (Large)
This is a same type observation program
of SOT-Case2-1 for large active region.
|
FOV |
Cadence |
Summing |
Compress |
FG:
Ca II H |
164h~109h |
90 sec |
2~2 |
Q50 |
FG:
G-band |
164h~109h |
120 min |
2~2 |
Q65 |
FG:
Na D I/V |
164h~164h |
90 sec |
2~2 |
|
Total data volume in 24-hour operation is
3,388Mbits.
·
SOT-Case3: Active region on
the Limb
Capture the temporal evolution of
filament eruption as the trigger of flares and arcade structure of flares.
|
FOV |
Cadence |
Summing |
Compress |
FG:
Ca II H |
109h~109h |
30 sec |
2~2 |
Q50 |
FG:
G-band |
109h~109h |
90 min |
2~2 |
Q65 |
Total data volume in 24-hour operation is
3,768Mbits.
·
SOT-Case4: Impulsive phase of
Flare (Flare mode)
Study the chromospheric evaporation and
particle acceleration process during the flare. Identify the foot-point of the
flare loop precisely and observe its motion during the flare, and also observe
white light flare.
(During the gFlare modeh by XRT)
|
FOV |
Cadence |
Summing |
Compress |
FG:
Ca II H |
109h~109h |
20 sec |
2~2 |
Q50 |
FG:
G-band |
109h~109h |
20 sec |
2~2 |
Q65 |
FG:
Red |
109h~109h |
20 sec |
2~2 |
Q65 |
FG:
Green |
109h~109h |
20 sec |
2~2 |
Q65 |
FG:
Blue |
109h~109h |
20 sec |
2~2 |
Q65 |
FG:
H-alpha |
109h~109h |
20 sec |
2~2 |
Q65 |
Total data volume in 20-min operation is
567Mbits.