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 seven M-class flares. Currently there are five AR on disk, but four of them are expected to rotate off the disk very soon.
How many GOES flares occurred?
Flares above B, C, M, X class were 39 30 7 0
And how many of these are listed in the RHESSI flare list?
Flares above B, C, M, X class were 21 17 5 0
And how many had EXCELLENT coverage?
Flares above B, C, M, X class were 12 11 2 0
There were RHESSI flares/GOES flares 188 / 76 over the time range 28-Mar-17 04-Apr-17
Memory Management
Early this week, the SSR was quiet 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.
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 126.6 and 124.7 K as of 19-Apr-2017. The cold plates, 1 and 2 are 152.7 and 152.7 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:
GAPS IN APP_ID = 102 (VC3-MONITOR RATES) WITH PACKET RATE LT 30 GAP START TIME GAP END TIME GAP (SEC) 2017-03-30T19:40:00.000 -- 2017-03-30T20:05:00.000 1500.0000 2017-04-02T06:00:00.000 -- 2017-04-02T06:25:00.000 1500.0000 2017-04-02T11:55:00.000 -- 2017-04-02T12:10:00.000 900.00000 2017-04-03T21:05:00.000 -- 2017-04-03T21:20:00.000 900.00000 2017-04-03T21:25:00.000 -- 2017-04-04T00:00:00.000 9300.0000
Detector issues
Detectors 1, 3, 6 and 8 are powered on, and are recording events. 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 |