Tohban Report 2013-10-16

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Tohban Reports
Start Date: 09 Oct 2013
End Date: 16 Oct 2013
Tohban: Nicole Duncan
Tohban email:
Next Tohban: Mitsuo Oka
List all reports


Solar Activity

The sun has been active this week, producing 3 M-class flares and 42 C-class. The most active region continues to be NOAA 11865 this week, it is 3/4 of the way across the disk and is still magnetically complicated. It is forecasted to continue to be active in the coming few days with a slight chance for more M flares. Earlier in the week, there was an occulted M-class flare over the NE limb. Stereo B shows that later in the week we can expect another AR to rotate onto disk.

How many GOES flares occurred?

 Flares above B, C, M, X class were      7    42     3     0

And how many of these are listed in the RHESSI flare list?

 Flares above B, C, M, X class were      5    30     3     0

And how many had EXCELLENT coverage?

 Flares above B, C, M, X class were      3    11     0     0

There were RHESSI flares/GOES flares 318 / 52 over the time range 08-Oct-13 15-Oct-13

Memory Management

Due to increased solar activity, the SSR did not fully empty at the end of pass sets. It is currently at ~4%. The decimation was changed to active_vigorous and extra passes were added this week.

We are taking data all night for both fronts and rears. There was discussion of changing the decimation to normal_vigorous and reducing the night data. The group decided to keep the spacecraft at active_vigorous decimation and taking all-night data.

Spacecraft Status

The cold plate 1 and 2 are at about 118.2 K and 116.6 K respectively. The length of eclipse is growing, and the temperatures are expected to decrease. The other systems are nominal.

Data Gaps

2 gaps in VC1 data, the data is not recoverable.


2013-10-13T03:45:00.000 -- 2013-10-13T03:50:00.000 300.00000

2013-10-13T05:25:00.000 -- 2013-10-13T05:30:00.000 300.00000

Detector issues

The recurrent noise issue in detector 9 is still present.

There were spikes observed during shutter motions. They were short duration, and were present in many detectors. The cause is likely due to microphonics.

Other notes

A spin-up was delayed on 2013-10-11 due to increased solar activity. A spin-up is due this week, at the discretion of the next tohban.

Spacecraft Management

No operations this week

Decimation Active/Vigorous
HLAT Decimation Rear decimation weight 6, no front decimation
Night time data (fronts) Enabled, during entire eclipse
Night time data (rears) Enabled, during entire eclipse
Require extra passes? Yes
Requirement for moving pointer? No
Attenuator operation Normal
Detector problems? None
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