Tohban Report 2015-12-16

Tohban Reports
Start Date:	9 Dec 2015
End Date:	16 Dec 2015
Tohban:	Mitsuo Oka
Tohban email:	moka@ssl.berkeley.edu
Next Tohban:	TBD
List all reports

Solar Activity

Solar activity was low (at B-class level) through out the week although there were some C-class activities during the weekend. There are 9 ARs on disk. 4 ARs are expected to be rotated off the disk within 1 or 2 days.

How many GOES flares occurred?

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

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

 Flares above B, C, M, X class were      2     1     0     0

And how many had EXCELLENT coverage?

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

There were RHESSI flares/GOES flares 183 / 7 over the time range 07-Dec-15 14-Dec-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 not emptying out.

Spacecraft Status

The cold plates, 1 and 2 were at 132.5 and 131.1 K, on 2015-12-15.

Data Gaps

No significantly large data gap.

GAPS IN APP_ID = 1 (VC1-SOH) WITH PACKET RATE LT 30

2015-12-11T19:35:00.000 -- 2015-12-11T19:50:00.000       900.00000

GAPS IN APP_ID = 154 (VC1-PMTRAS) WITH PACKET RATE LT 4

2015-12-11T19:40:00.000 -- 2015-12-11T19:50:00.000       600.00000

Detector Issues

D1

Early the week, we observed enhanced fast rates (and reduced livetime) in the rear segment of D1 and D7. Because rear-fast threshold is already 0xFF, we tried lowering HV. This helped D7, but there was no obvious change in the D1 monitor rates.

 Dec 14, 18:19, lowered HV from 3600 to 3400 V.

D2

Dec 09, 23:42, raised front fast threshold from 0x70 to 0xFF
Dec 14, 18:19, lowered HV from 4100 to 3900 V

D3

No improvement after power-cycling (The plan was to lower front slow threshold from 0xC0 to 0xB0 if the power-cycling could successfully reduce noise).

Dec 10, 16:42-18:19, power-cycling

D4

HV was lowered in an attempt to reduce slow rates. The slow rates did decrease, but, when the events were turned on for a few minutes, the rate of write pointer motion increased significantly.

Dec 10, 21:38, lowered HV from 1500 V to 1000 V
Dec 12, 00:33, events turned on for 3.5 min

D5

No change made

D6

D6 front slow threshold was lowered without significant increase of slow rates.

Dec 10, 19:58, lowered front slow threshold from 0x40 to 0x30
Dec 12, 00:30, lowered front slow threshold from 0x30 to 0x20

D7

D7 front slow threshold was lowered to 0x10 but was brought back to 0x20 due to a significant increase of slow rates. D7 HV was lowered in attempt to reduce D7 rear fast rates (and to recover the livetime of the rear segment).

Dec 10, 21:38, lowered front slow threshold from 0x20 to 0x10
Dec 12, 00:33, lowered HV from 3500 to 3300 V
Dec 12, 19:20, raised front slow threshold from 0x10 to 0x20 

D8

No change made

D9

D9 is off

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	Working as expected
Detector problems?	See notes above.