Tohban Report 2012-12-26

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Tohban Reports
Start Date: 19 Dec 2012
End Date: 26 Dec 2012
Tohban: Mitsuo Oka
Tohban email:
Next Tohban: Pascal Saint Hilaire (
List all reports


Solar Activity

The Sun remained quiet this week, but solar activity is now picking back up as one of 4 currently active regions on the disk (AR 11635) has produced several C flares during the last two days. STEREO B shows one further active region which will rotate onto the disk in the next few days.

How many GOES flares occurred?

 Flares above B, C, M, X class were     32    16     0     0

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

 Flares above B, C, M, X class were     24    11     0     0

And how many had EXCELLENT coverage?

 Flares above B, C, M, X class were     13     9     0     0

There were RHESSI flares/GOES flares 200 / 48 over the time range 19-Dec-12 26-Dec-12

Memory Management

The SSR fill level was relatively high earlier this week because of replaying data in response to the ground station problems from the previous week.

Spacecraft Status

The CPC temperature was high but trending normally with day length.

Data Gaps

There was a large data gap due to the Wallop station problem.

 GAP START TIME              GAP END TIME                   GAP (SEC)
 2012-12-20T01:10:00.000 -- 2012-12-20T04:55:00.000       13500.000

Detector issues

Here is the high voltage changes made this week.

 2012-356-20:07:08 /ihvdac detector=8, voltage=127 (2475.5 V)
 2012-356-20:08:51 /ihvdac detector=4, voltage=221 (4313.8 V)

Detector 8 seems to have been quiet since this change. It looks like it actually quieted before the HV adjustment, although some of the data from that interval still shows noise. Detector 8 should be turned back on next week by the Ops team at their earliest convenience.

As for Detector 4, we don't see signs of desegmenting in the most recent plots, other than very briefly during the SAA.

Decimation active/vigorous
HLAT Decimation Rear decimation weight 6, no front decimation
Night time data (fronts) +/- 4 min
Night time data (rears) +/- 4 min
Require extra passes? Yes
Requirement for moving pointer? Some data replayed
Attenuator operation Normal
Detector problems? D4 and D8
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