Tohban Report 2015-10-07

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Tohban Reports
Start Date: 30 Sep 2015
End Date: 7 Oct 2015
Tohban: Juan Carlos Martinez Oliveros and Hazel Bain
Tohban email:
Next Tohban: Lindsay Glesener
List all reports


Solar Activity

In the first half of the week solar activity was moderate with 7 M class flares, mostly originating in active region NOAA 12422. AR 12422 rotated over the limb on the 4th of October, after which the Sun became very quiet with a background solar flux at the low B class level. There are currently only 2 active regions on the disk, one of which will rotate over the limb within the next 24 hours. Quiet Sun conditions are expected to continue for the next few days.

How many GOES flares occurred?

 Flares above B, C, M, X class were      4    38     7     0

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

 Flares above B, C, M, X class were      0    14     5     0

And how many had EXCELLENT coverage?

 Flares above B, C, M, X class were      0     4     3     0

There were RHESSI flares/GOES flares 43 / 49 over the time range 30-Sep-15 07-Oct-15

Memory Management

The SSR is a bit high due to high solar activity, with a max of 69% and is now at a minimum of 28% after the last pass yesterday due to events being turned off on D4.


The cold plate temps have come up a bit. CP1 = 135.9K, CP2 = 134.2K.

Data Gaps

GAP START TIME GAP END TIME GAP (SEC) 2015-10-02T04:05:00.000 -- 2015-10-02T04:10:00.000 300.00000 NO GAPS IN APP_ID = 154 (VC1-PMTRAS) NO GAPS IN APP_ID = 102 (VC3-MONITOR RATES)

Detector issues

15-276-01:48:22 start idib_chg_thrshld(3, FRONT, SLOW, 0x0C) ; was 0x1C
15-276-01:48:37 /IDPLOAD VALUE=0x0C
15-278-21:28:51 start idib_chg_thrshld(3, FRONT, SLOW, 0x15)  ; was 0x0C
15-278-21:29:13 /IDPLOAD VALUE=0x15
15-278-21:29:49 start idib_chg_thrshld(6, FRONT, SLOW, 0x40)  ; was 0x30
15-278-21:30:03 /IDPLOAD VALUE=0x40

Furthermore G4 was primarily responsible was the increasing SSR fill level (max ~68%). Over the weekend the behavior of D4 changed causing very high fast valids and live time at or near 0%. This low live time has prevented G4 from putting a lot of noise into the SSR. However over the previous few days, the fast valids declined and the livetime rose to around 74%. This has allowed G4 to begin putting more than 9k events per second. Because of this, we further increased the G4 front slow valid, in steps up to max threshold 0xFF. This had no effect whatsoever (slow valid counts appear to be stuck on just one value). This is similar to some of the strange behavior was previously saw in G9.

15-279-00:37:28 start idib_chg_thrshld (4, FRONT, SLOW, 0xE0)  ; was 0xD0
15-279-00:37:42 /IDPLOAD VALUE=0xE0
15-279-00:38:20 start idib_chg_thrshld (4, FRONT, SLOW, 0xF0)  ; was 0xE0
15-279-00:38:29 /IDPLOAD VALUE=0xF0
15-279-00:39:19 start idib_chg_thrshld (4, FRONT, SLOW, 0xFF)  ; was 0xF0
15-279-00:39:30 /IDPLOAD VALUE=0xFF

In order to deal with the high SSR fill level we halted collection of detector 4 events. We also loaded a modified version of RTS 26 so that G4 events would stay off, when the other detector events were turned back on, after each eclipse exit. We noted an immediate decrease in the SSR write rate, as soon as G4 events were turned off. This SSR fill level has since begun to decrease.

Turn off G4 events

15-279-02:16:10 /itmoff value=dib4

Load modified RTS 26 so the G4 events stay off

15-279-02:17:05 start sc_tbl_loadpkt("T15271SLTN61_No_G4_G9.00")

The front slow threshold on detector 6 was also increased

15-279-00:40:54 start idib_chg_thrshld (6, FRONT, SLOW, 0x50)  ; was 0x40
15-279-00:41:08 /IDPLOAD VALUE=0x50

Attenuator Issues

15-276-01:49:28 start attenuator013_2015_276

Thin In: 15 (was 13) -> 5.89% Thin Out: 14 (was 11) -> 5.5% Thick Out: 15 (was 12) -> 5.89%

15-278-23:07:35 start attenuator013_2015_278

This resulted in the thin attenuator moving out, as expected.

The current attenuator threshold values are currently on the edge of being triggered by background noise. The next tohban might consider increasing the Thin In level for the attenuator motions (set to 7%).

Other notes

Spacecraft Management

There was a spin up on DOY 273 up to ~15 rpm.

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 Looks ok.
Detector problems? See notes above.
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