Tohban Report 2015-02-04

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Tohban Reports
Start Date: 28 Jan 2015
End Date: 04 Feb 2015
Tohban: Nicole Duncan
Tohban email:
Next Tohban: Mitsuo Oka
List all reports


Solar Activity

We began the week with moderate solar activity that picked up rapidly over the course of a few days. This was followed by a dramatic decrease as the 2 ARs producing all the C and M class activity drastically quieted down. Today activity has picked up again with a few C and an M-class event mostly coming from AR 12277 at disk center. Forecast is for medium solar activity to continue over the next week. There is one AR that rotated on in the past few days, but it isn't very complex.

How many GOES flares occurred?

 Flares above B, C, M, X class were     1     45    6    0

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

 Flares above B, C, M, X class were      0    33     4     0

And how many had EXCELLENT coverage?

 Flares above B, C, M, X class were      0     15     0     0

There were RHESSI flares/GOES flares 351 / 52 over the time range 21-Jan-15 28-Jan-15

Memory Management

We've stayed in active/vigorous mode all week, but adjusted taking night data to balance the solar activity. Full night events were turned off at 030-00:33 UT and was requested to be turned back on as of Thursday due to low activity over the weekend. Since solar activity just picked up again, and we started today off at 35%, the Tohban might consider keeping nighttime events off if activity continues.

Spacecraft Status

The spacecraft was nominal this week.

Data Gaps

VC1 - SOH gaps - many over days 1/29, 1/30 and 2/3, due to poor downlink quality. But have cleared up since.



2015-01-29T17:50:00.000 -- 2015-01-29T17:55:00.000 300.00000

2015-02-03T20:50:00.000 -- 2015-02-03T20:55:00.000 300.00000

VC3 - Monitor Rates


2015-01-30T19:05:00.000 -- 2015-01-30T19:10:00.000 300.00000


Cold Plates 1/2 are at 128.9/127.5 and Cold Tips 1/2 are at 107.9/106. Cold plate temps will come up after Feb 6th.

The Cryocooler Power Converter Temperature (CPC_temp?) has drifted into the yellow a few times this week at 51.2 C. Its usually ~40 C with variations of +/- 5 C.

Detector issues

D6 front fast threshold was adjusted from default (0x22) due to increased rates. Rates dropped from 3300 to 1250 when the change was made.


15-030-00:20:17 /IDPLOAD VALUE=0x30  ; was 0x22

Other notes

Cryocooler Talk: Because cold plate temperatures are set to continue decreasing over the past few days, we are discussing if we should temporarily increase power during this time.

Decision: Temporarily increase the power to 72W, an increase of 5W. Monitor the accelerometer and cold tip temperatures for changes. This will be done today.

Spacecraft Management

Decimation Active / Vigorous
Night time data (fronts) On
Night time data (rears) On
Require extra passes? No
Requirement for moving pointer? No
Attenuator operation Normal
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