Tohban Report 2015-12-16

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== Solar Activity ==
== 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 ==
== Memory Management ==
Line 17: Line 27:
== Spacecraft Status ==
== Spacecraft Status ==
-
The cold plates, 1 and 2 were at 136.9 and 135.4 K, on 2015-11-30.
+
The cold plates, 1 and 2 were at 132.5 and 131.1 K, on 2015-12-15.
== Data Gaps ==
== Data Gaps ==
 +
No significantly large data gap.
-
== Detector issues ==
+
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===
-
D2
 
  Dec 09, 23:42, raised front fast threshold from 0x70 to 0xFF
  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).
-
D3
 
  Dec 10, 16:42-18:19, power-cycling
  Dec 10, 16:42-18:19, power-cycling
-
D4
+
===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 10, 21:38, lowered HV from 1500 V to 1000 V
  Dec 12, 00:33, events turned on for 3.5 min
  Dec 12, 00:33, events turned on for 3.5 min
-
D6
+
===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 10, 19:58, lowered front slow threshold from 0x40 to 0x30
  Dec 12, 00:30, lowered front slow threshold from 0x30 to 0x20
  Dec 12, 00:30, lowered front slow threshold from 0x30 to 0x20
-
D7
+
===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 10, 21:38, lowered front slow threshold from 0x20 to 0x10
  Dec 12, 00:33, lowered HV from 3500 to 3300 V
  Dec 12, 00:33, lowered HV from 3500 to 3300 V
  Dec 12, 19:20, raised front slow threshold from 0x10 to 0x20  
  Dec 12, 19:20, raised front slow threshold from 0x10 to 0x20  
 +
 +
===D8===
 +
 +
No change made
 +
 +
===D9===
 +
 +
D9 is off
== Other notes ==
== Other notes ==

Latest revision as of 08:34, 16 December 2015


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



Contents

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

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 Working as expected
Detector problems? See notes above.
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