Tohban Report 2015-03-25

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Tohban Reports
Start Date:	18 Mar 2015
End Date:	25 Mar 2015
Tohban:	Jim McTiernan
Tohban email:	jimm@ssl.berkeley.edu
Next Tohban:	TBD

1 Solar Activity
2 Memory Management
3 Spacecraft Status
4 Data Gaps
5 Detector issues
6 Other notes
7 Spacecraft Management

Solar Activity

Some activity, but not much. Some C and one M flare.

How many GOES flares occurred?

 Flares above B, C, M, X class were      8    30     1     0

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

 Flares above B, C, M, X class were      6    20     1     0

And how many had EXCELLENT coverage?

 Flares above B, C, M, X class were      5    11     0     0

There were RHESSI flares/GOES flares 218 / 39 over the time range 17-Mar-15 24-Mar-15

Memory Management

Decimation was active/vigorous for the full time period. Both front and rear detectors are off during SC night, except for 4 minutes on either side. The SSR is at 30%, with all BGS passes yet to happen.

Spacecraft Status

The cold plates, 1 and 2 were at 131.1 and 129.65 K, on 2015-03-23. The solar array temperature (1) and the Cryocooler power converter temperature are consistently above thier yellow limits, at 100 and 53 C, respectively. Maybe we need a limits change

Data Gaps

VC1 Gaps

GAP START TIME GAP END TIME GAP (SEC)

2015-03-19T18:20:00.000 -- 2015-03-19T18:30:00.000 600.00000

2015-03-19T23:20:00.000 -- 2015-03-19T23:25:00.000 300.00000

2015-03-21T22:40:00.000 -- 2015-03-21T22:45:00.000 300.00000

VC3 Gaps

2015-03-23T23:00:00.000 -- 2015-03-23T23:05:00.000 300.00000

2015-03-24T18:15:00.000 -- 2015-03-24T18:20:00.000 300.00000

Detector issues

Detectors 2 and 4 are unsegmented. We raised the rear fast threshold on D9 to 0xc0 on 18-mar-2015, to try to increase live time. This did not work very well; live time for D9r peaks at 20%. D8 rear also has live time decreasing each day, now D8r live time peaks at 80%.

On 20-mar-2015, we lowered the HV on D6 by 20 steps, this resulted in a live time increase for D6f from 40 to 90 %. Efforts to lower the fast threshold from 0x70 to 0x50 failed.

Other notes

Spacecraft Management

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	Normal
Detector problems?	See motes above.