Tohban Report 2012-07-11

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Tohban Reports
Start Date: 4 July 2012
End Date: 11 July 2012
Tohban: Hazel Bain
Tohban email:
Next Tohban: Claire Raftery
List all reports


Solar Activity

Solar activity was high this week with AR 11515 producing a large number of M-class and one X-class flares. The background solar flux was at mid - high GOES C-class level. AR 11515 has now rotated off the disk and the solar background flux has dropped slightly. In the last few days AR 11520 has begun producing a number of C and M class flares. In the last 24 hours this AR has been seen to decay slightly and has been down graded from a beta-gamma-delta configuration to a beta-gamma. However a Major Flare Watch is still in place for this region with the chance of further M-class flares.

How many GOES flares occurred?

 Flares above B, C, M, X class were      0    65    31     1

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

 Flares above B, C, M, X class were      0    45    19     0

And how many had EXCELLENT coverage?

 Flares above B, C, M, X class were      0    23     9     0

There were RHESSI flares/GOES flares 402 / 97 over the time range 04-Jul-12 11-Jul-12

Memory Management

Due to the increased solar activity a number of extra WHM and WLPS passes were scheduled to download the data. The SSR reached a max of ~60%. Currently the SSR is around ~30%.

Spacecraft Status

Cold plate 1 and 2 are currently sitting at 106 and 105 K respectively. This is partially due to the current day length, however in general the temperature is slowly increasing. It was decided to increase the cryocooler power to 78 W to combat the rising temperatures. Future tohbans should check that the cold tip temperature does not increase above ~90K for a crycocooler power of 80 W, as per the anneal cooling curve. Vibrations should be monitored. Currently vibrations are around 13 mg, which is a considered low, toward the start of the mission vibrations were around 20 mg. Tohbans should also keep an eye on the CPC temperature, which is currently at 44 oC, anything much above 50oC in the region of 60oC should cause for concern.

Data Gaps

There were no data gaps this week.

Detector issues

Detector 8 is starting to look a little noisy coming out of the SAA, something to keep an eye on.

Other notes

Spacecraft Management

Decimation Active/vigorous (as of day 184)
HLAT Decimation
Night time data (fronts) +/- 4 minutes
Night time data (rears) +/- 4 minutes
Require extra passes? Yes
Requirement for moving pointer? No
Attenuator operation Normal
Detector problems? Not significant ones.
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