Tohban Report 2016-02-03

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Tohban Reports
Start Date: 27 Jan 2016
End Date: 3 Feb 2016
Tohban: Juan C. Martinez Oliveros
Tohban email:
Next Tohban: TBD
List all reports


Solar Activity

Solar activity was very low this week dominated by 11 C-class flares and some CMEs. There are currently 4 ARs on the disk with the probability of some C class flares in the following days. Two of the active regions will rotate out of the disk in following days.

How many GOES flares occurred?

 Flares above B, C, M, X class were     18    11     0     0

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

 Flares above B, C, M, X class were     12     9     0     0

And how many had EXCELLENT coverage?

 Flares above B, C, M, X class were      9     5     0     0

There were RHESSI flares/GOES flares 98 / 29 over the time range 27-Jan-16 03-Feb-16

Memory Management

The SSR fill level reached a maximum of 20% and a minimum of about 0% during the week.

Spacecraft Status

The cold plate 1 and 2 are at about 130.0 K and 128.8 K respectively.

Data Gaps

No data gaps this week.

Detector issues

Detector 1: The HV on this detector was lowered to ~1500V on January 27. No visible change on the rear reset rates were observed due to the change.

2016-027-20:16:13 /IHVDAC DETECTOR=1, VOLTAGE=77   ; 1500V from 2000V

In the last couple of days, the livetime of the rear segment deteriorated.

Detector 2: No changes were made during the week.

Detector 3: Offline

Detector 4: On January 27 the slow front the threshold was changed to A0 to evaluate the impact of such change on the SSR fill level. The threshold change was made for the duration of the pass, returning to the original value of C0. The result of this experiment demonstrated a minimal impact on the SSR fill level.

2016-027-20:14:00 /IDPLOAD VALUE=0xA0  ; was 0xC0
2016-027-20:19:18 /IDPLOAD VALUE=0xC0  ; was 0xA0

On January 29, we changed the detector slow front threshold to A0 for one orbit and egain evaluated the impact of this change on the SSR fill level. Again the impact was minimal. At the end of the orbit the slow front threshold was changed to C0.

2016-029-17:45:10 /IDPLOAD VALUE=0xA0  ; was 0xC0
16-029-19:27:07 /IDPLOAD VALUE=0xC0  ; was 0xA0

At 22:43:12 UT on January 29 the slow front threshold was changed to A0. Since then no detrimental repercussions on the SSR fill level have been observed.

16-029-22:43:22 /IDPLOAD VALUE=0xA0  ; was 0xC0

Detector 5: No changes were made during the week.

Detector 6: Offline

Detector 7:

On January 27 the slow front threshold was changed from 0x20 to 0x10. After the change a huge number of slow counts were observed, so it was decided to restore the previous slow front threshold value of 0x20.

2016-027-20:14:47 /IDPLOAD VALUE=0x10  ; was 0x20
2016-027-20:15:44 /IDPLOAD VALUE=0x20  ; was 0x10

During the weekend the rear livetime of this detector decreased to almost zero, no measures to correct this were made, because the livetime returned to a normal value earlier in the week.

Detector 8: Offline

Detector 9: Offline

Other notes

Spacecraft Management

Decimation Active/Vigorous
Night time data (fronts) +- 4 minutes
Night time data (rears) +- 4 minutes
Require extra passes? No
Requirement for moving pointer? No
Attenuator operation See above
Thin Att. in 22.74%
Thin Att. out 19.21%
Thick Att. in 24.70%
Thick Att. out 18.43%
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