Tohban Report 2017-04-19
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Tohban Reports | |
---|---|
Start Date: | 29 March 2017 |
End Date: | 5 April 2017 |
Tohban: | Milo Buitrago-Casas |
Tohban email: | milo@ssl.berkeley.edu |
Next Tohban: | TBD |
List all reports |
Contents |
Solar Activity
The Sun was active this week, producing a handful of B-class flares and two C-flares, one yesterday and one this morning. Currently, there is one AR peeping out on the Est limb and is expected to remain on disk this coming week with a slight chance to host M-class flares.
How many GOES flares occurred?
Flares above B, C, M, X class were 18 1 0 0
And how many of these are listed in the RHESSI flare list?
Flares above B, C, M, X class were 8 1 0 0
And how many had EXCELLENT coverage?
Flares above B, C, M, X class were 0 0 0 0
There were RHESSI flares/GOES flares 22 / 19 over the time range 11-Apr-17 18-Apr-17
Memory Management
Early this week, the SSR was quite high ~40% at due to the four detectors that were on last week. After turning off detectors 1 and 8 on April 12, the SSR was gradually emptying reaching a minimum of 9% at the end of the day on Monda April 17. In response to the rotation on the disk of a big Active Region, detectors 1 and 8 were turned on again so the SSR is expected to gradually increase this week. Currently, it is at 18.4%.
Spacecraft Status
Detectors 3 and 6 are recording events. Due to a big active region on the solar disk, detectors 1 and 8 were turned on.
The cold tips are 127.3 and 125.1 K as of 19-Apr-2017. The cold plates, 1 and 2 are 152.5 and 151.0 K. Cryocooler power is steady at 74.9W. See:
http://sprg.ssl.berkeley.edu/~ayshih/soh/latest_temperatures.pdf
for a summary plot of recent temperatures, efficiencies and accelerometer values.
Data Gaps
Relatively large (>300 sec) data gaps as follows:
GAP START TIME GAP END TIME GAP (SEC) 2017-04-15T17:25:00.000 -- 2017-04-15T22:40:00.000 18900.000 2017-04-15T17:25:00.000 -- 2017-04-15T22:35:00.000 18600.000 2017-04-13T13:50:00.000 -- 2017-04-13T14:00:00.000 600.00000
Detector issues
Detectors 1, 3, 6 and 8 are on and working. While the AR2644 that produced M-class flares is now at the limb, there is still another big AR on disk. So it was determined to keep the detectors 1 and 8 on unless there is an issue with the temperatures.
Notes
For the flare of April 3 14UT, pileup was relatively high (40% at 30 keV) with the attenuator state A1. It was decided to revisit the current thresholds of the thin/thick attenuator logic.
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 | None |
Detector problems? | None |