Tohban Report 2016-01-20

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Tohban Reports
Start Date: 13 Jan 2016
End Date: 20 Jan 2016
Tohban: Jim McTiernan
Tohban email:
Next Tohban: TBD
List all reports


Solar Activity

Not much,

How many GOES flares occurred?

 Flares above B, C, M, X class were     27     4     0     0

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

 Flares above B, C, M, X class were      3     1     0     0

And how many had EXCELLENT coverage?

 Flares above B, C, M, X class were      3     1     0     0

There were RHESSI flares/GOES flares 9 / 31 over the time range 12-Jan-16 19-Jan-16

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 was at 10% at the end of yesterday's passes.

On 15 January (day 015!) we skipped the playback pointer to free memory, this resulted in a vc3 data gap from 2016-014-23:30 to 2016-015-15:00 UTC.

Spacecraft Status

The cold plates, 1 and 2 were at 138.3 and 136.8 K, on 2016-01-18.

Data Gaps

No VC1 Gaps


 GAP START TIME              GAP END TIME                   GAP (SEC)
 2016-01-14T15:35:00.000 -- 2016-01-14T15:40:00.000       300.00000
 2016-01-14T23:20:00.000 -- 2016-01-15T15:05:00.000       57700.000

Detector issues

Detector 2 is unsegmented, Detector 9 is off, detectors 3, 4, 6 and 8 are not recording events. D6 was turned off beacuse it was filling the memory with noise.

D1 - HV was lowered to 2500 V

 2016-013-21:20:47 /IHVDAC DETECTOR=1, VOLTAGE=129 ; 2500 V

D2 - No changes

D3 - No changes

D4 - On Jan 13, Detector 4 was lowered from 500 to 200 V. Events were recorded in sunlight for 3 minutes, and later for 8 minutes. The spectra seem ok, so we may want to try D4 for a full orbit:

 2016-013-21:21:18 /IHVDAC DETECTOR=4, VOLTAGE=11 ; 200 V
 2016-013-21:21:41 G4 events on
 2016-013-21:24:39 G4 events off
 2016-013-23:00:55 G4 events on
 2016-013-23:08:06 G4 events off

For spectra see:

D5 - On 15 Jaunary we raised the Front Fast Threshold from 0x70 to 0x80, to increase live time; this reduced the Attenuator Average Deadtime to 17%, and popped out the thin attenuator, which had been in since approximately 22:00 on 14-Jan.

 2016-015-01:46:23 start idib_chg_thrshld (5, FRONT, FAST, 0x80)
 2016-015-01:46:27 /IDPUDUMPTABL TABLE=DIBTBL5
 2016-015-01:46:35 /IDPLOAD VALUE=0x80

D6 - On 13 January, we dropped the D6 HV to 500 V, to reduce noise and see if any spectrum could be recovered. No luck there, so on 15 january, we dropped the HV to 200 V. D6 desegmented and began to fill the memory. We raised the HV back to 500 V, and turned events off.

 2016-013-23:02:09 /ihvdac detector=6, voltage=28 ; 500 V
 2016-015-01:41:44 /ihvdac detector=6, voltage=11
 2016-015-23:40:07 /ITMOFF VALUE=DIB6 ; off permanently
 2016-015-23:40:25 /IHVDAC DETECTOR=6, VOLTAGE=28 ; 500 V

D7 - No changes

D8 - No changes

D9 - No changes

A spin up to 15 RPM was performed between 2016-013 21:23 and 22:59 UTC.

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? Yes, see notes above
Attenuator operation Working as expected
Detector problems? See notes above.
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