Tohban Report 2014-06-11

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Tohban Reports
Start Date: 04 Jun 2014
End Date: 11 Jun 2014
Tohban: Mitsuo Oka (Vice Tohban: Hugh Hudson)
Tohban email:
Next Tohban: Hazel (Vice Tohban: Brian)
List all reports


Solar Activity

Earlier this week, the sun was very quiet at B-level. However, the activity suddenly became high after AR12087 started rotating over the south-east limb on Tuesday Jun 10. This AR has so far produced 3 X-class flares. There are currently 9 ARs on the disk. STEREO B shows there is another large AR that would rotate on disk next week.

How many GOES flares occurred?

 Flares above B, C, M, X class were     13    31     4     3

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

 Flares above B, C, M, X class were      6    20     3     2

And how many had EXCELLENT coverage?

 Flares above B, C, M, X class were      5    10     2     0

There were RHESSI flares/GOES flares 139 / 51 over the time range 03-Jun-14 11-Jun-14

Memory Management

The SSR is emptying at the end of the daily pass set. The maximum was 27% (The last pass ended 5% with one AGO pass left).

Spacecraft Status

All looks good. The cold plate 1 and 2 are at 117.6 K and 116.2 K respectively. Spin rate 14.7rpm.

Data Gaps

There is no large data gap to report.

Detector issues

After making the D4 threshold change earlier this week, the monitor rates remained steady. The other change in D7 threshold was to see if it can be used for the average livetime calculation.

Jun 5, D4 rear fast threshold from 0xB0 to 0xC0

Jun 9, D7 rear slow threshold from 0x30 to 0x40

Other notes

The detectors used to calculate the average livetime were changed from D2 & D5 (twice each) to D2 only (at Jun 9, 17:01:50 UTC).

Possible timings of annealing was discussed. Results of spectral analysis were presented by the tohban and Hazel. The team has an impression that Detectors 3,6 (and maybe 8, 9 as well) are not so good for spectroscopy especially in the <15 keV range. Thus, more people seem to be in favor of annealing soon. It was also pointed out that an earlier annealing would allow us to have a larger chance of observing good flares and to have a longer time for unsegmented detectors to be segmented. Over the next week, Albert will further consult the engineering team as well as the science team.

Spacecraft Management

No operations this week

Decimation Active/Vigorous
HLAT Decimation Rear decimation weight 6, no front decimation
Night time data (fronts) +/- 4 minutes
Night time data (rears) +/- 4 minutes
Require extra passes? No
Requirement for moving pointer? No
Attenuator operation Active
Detector problems? 1, 3, 5
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