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
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