Tohban Report 2017-08-09
| Tohban Reports | |
|---|---|
| Start Date: | 2 August 2017 |
| End Date: | 9 August 2017 |
| Tohban: | Pascal Saint-Hilaire |
| Tohban email: | pascal@ssl.berkeley.edu |
| Next Tohban: | TBD |
| List all reports | |
Solar Activity
Solar activityt was very low this week.
How many GOES flares occurred?
Flares above B, C, M, X class were 19 1 0 0
And how many of these are listed in the RHESSI flare list?
Flares above B, C, M, X class were 5 1 0 0
And how many had EXCELLENT coverage?
Flares above B, C, M, X class were 4 0 0 0
There were RHESSI flares/GOES flares 8 / 20 over the time range 01-Aug-17 08-Aug-17
Memory Management
Decimation was active/vigorous for the full time period, with the SSR level currently at around 20 - 30%.
Spacecraft Status
Detectors 1, 3, 6, and 8 are recording events. The temperatures are about 130K and 128K for cold tips 1 and 2, respectively, as of July 26. The cold plates 1 and 2 are at about 156K and 155K. Cryocooler power is steady at ~75W, for recent temperatures, cryocooler efficiencies, and accelerometer values see:
http://sprg.ssl.berkeley.edu/~ayshih/soh/latest_temperatures.pdf
Data Gaps
A whole orbit on Aug 3 (~16:00 UT) seems to be missing.
Detector issues
Detectors 1, 3, 6, and 8 are powered on, and are recording events. No detector operations this week.
Both attenuators were IN on Monday, due to high D3f deadtime. D3f determines attenuator movements. Changes to the fast and slow thresholds have not helped. Hence, the reference deadtime level was raised to 24%, which brought both attenuators out. Detector deadtime has been slowly creeping up -- a lowering of the HV might be the only way to mitigate this.
- G3 front fast
2017-219-19:19:22 /IDPUTABLE3 OFFSET=FRONTFASTDAC 2017-219-19:19:40 /IDPULOAD VALUE=0xFF ; was 0xD0 2017-219-19:20:32 /IDPUTABLE3 OFFSET=FRONTFASTDAC 2017-219-19:20:44 /IDPULOAD VALUE=0xD0 ; was 0xFF
- G3 front slow
2017-219-20:59:10 /IDPUTABLE3 OFFSET=FRONTSLOWDAC 2017-219-20:59:20 /IDPULOAD VALUE=0x30 ; was 0x15 2017-219-21:00:30 /IDPUTABLE3 OFFSET=FRONTSLOWDAC 2017-219-21:00:39 /IDPULOAD VALUE=0x15 ; was 0x30
Cold plate at 157 K.
Notes
A spin up was concluded on Monday.
Spacecraft Management
| Decimation | Active/Vigorous |
| HLAT Decimation | Rear decimation |
| Night time data (fronts) | plus/minus 4 minutes from daylight |
| Night time data (rears) | plus/minus 4 minutes from daylight |
| Require extra passes? | No |
| Requirement for moving pointer? | No |
| Attenuator operation | See Notes above |
| Ref. deadtime for Att.thresholds | 24.x% |
| Detector problems? | See above |