Tohban Report 2015-12-16
From RHESSI Wiki
|Start Date:||9 Dec 2015|
|End Date:||16 Dec 2015|
|List all reports|
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
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.
The cold plates, 1 and 2 were at 132.5 and 131.1 K, on 2015-12-15.
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
Enhanced fast rates (and reduced livetime) in the rear segment. Because rear-fast threshold is already at 0xFF, we tried lowering HV. No obvious change in the monitor rates.
Dec 14, 18:19, lowered HV from 3600 to 3400 V.
Dec 09, 23:42, raised front fast threshold from 0x70 to 0xFF Dec 14, 18:19, lowered HV from 4100 to 3900 V
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
HV was lowered in an attempt to reduce slow rates. The slow rates did decrease a little, 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
No change made
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 front slow threshold was lowered to 0x10 but was brought back to 0x10 due to 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
No change made
D9 is off
|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.|