Tohban Report 2014-04-02

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Tohban Reports
Start Date: 26 Mar 2014
End Date: 02 Apr 2014
Tohban: Pascal Saint-Hilaire
Tohban email:
Next Tohban: Jim McTiernan
List all reports


Solar Activity

Solar activity this week was moderate. GOES baseline level at ~B6. 35 C-flares observed by RHESSI, and one well-observed X-flare at disk center. Few counts above 300 keV, though.

How many GOES flares occurred?

 Flares above B, C, M, X class were      2    55     5     1

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

 Flares above B, C, M, X class were      2    43     4     1

And how many had EXCELLENT coverage?

 Flares above B, C, M, X class were      2    27     1     1

There were RHESSI flares/GOES flares 286 / 63 over the time range 27-Mar-14 03-Apr-14

NOAA predicts 5% chance of an X-flare in the next 48 hrs.

Memory Management

The SSR reached a max of ~38%, minimum of ~17%. Front decimation has been on a majority of the time since the X-flare. The plan is to stop taking rear detector events at night, in order to slightly decrease the memory fill level and prevent this decimation from kicking in.

Spacecraft Status

Cold plate temperatures are 117.0K and 115.5K. Cryocooler is operating normally (12 mg, 17 W). Spin rate 14.9 rpm.

Data Gaps

No data gaps of note.

Detector issues

Threshold changes last Thursday: D6f slow: x1A --> x20 D8r fast: x90 --> xA0 D9r fast: x90 --> xB0

And on Saturday: D6f slow: x20 --> x30 D9r fast: xB0 --> x70 (this last because the previous threshold change did not lead to improvements)

D6f livetime now hovers around 85%. D9f livetime creeping down slowly (at ~0.5%/day, currently at 85%). G9r livetime at 95% and holding steady for now.

Other notes

Attenuators came back to "0" position after flares, so no problems there this week.

Spacecraft Management

Decimation Active/Vigorous
HLAT Decimation Rear decimation weight 6, no front decimation
Night time data (fronts) Disabled (4 minutes before and after eclipse)
Night time data (rears) Enabled
Require extra passes? No
Requirement for moving pointer? No
Attenuator operation Normal
Detector problems? Detectors 3, 6 and 8.
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