Tohban Report 2017-04-05
| Tohban Reports | |
|---|---|
| Start Date: | 29 March 2017 |
| End Date: | 5 April 2017 |
| Tohban: | Mitsuo Oka |
| Tohban email: | moka@ssl.berkeley.edu |
| Next Tohban: | Juan Carlos Martinez |
| List all reports | |
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 the week, the SSR was at 0% at the end of each day's contacts. In response to the high solar activities and the turn-on of some detectors, the SSR reached 80% and the decimation was switched to active/vigorous from normal/vigorous.
Spacecraft Status
Detectors 3 and 6 are recording events. Due to the increased solar activities, D1, 5 and 8 were turned on. D5 was turned off after ~24 hours due to its unexpectedly high event rate.
The cold tips are 129.5 and 128.0 K as of 5-Apr-2017. The cold plates, 1 and 2 are 153.3 and 151.8 K. Cryocooler power is steady at 76W. 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 |