Tohban Report 2017-04-19
From RHESSI Wiki
|Start Date:||29 March 2017|
|End Date:||5 April 2017|
|Next Tohban:||Jim McTiernan|
|List all reports|
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
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%.
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:
for a summary plot of recent temperatures, efficiencies and accelerometer values.
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
Because the moderate solar activity early this week, and the presence of a new active region on the Est solar limb, it was decided to turn on detectors 1 and 8 the past Monday Abril 17 around 21:30UT. Temperatures on the cold plates and tips looked stable during the last couple of days after turning on those two detectors. Also the SSR filling level has been rather low (~15% at the end of the passes).
Commanding were the follow:
2017-107-21:31:18 start idib_on_g1 2017-107-21:31:35 start idib_on_g8 2017-107-21:32:05 start ihv_ramp_stage2_g1 ; 1000 V 2017-107-21:32:20 start ihv_ramp_stage2_g8 ; 1000 V
17-107-23:09:42 start ihv_ramp_stage3_g1 17-107-23:09:58 start ihv_ramp_stage3_g8
17-107-23:14:37 start sc_ssr_rtime halted
17-108-00:40:32 start idib_chg_thrshld(8, FRONT, FAST, 0x90) 17-108-00:40:36 /IDPUDUMPTABL TABLE=DIBTBL8 17-108-00:40:36 /IDPUTABLE8 OFFSET=FRONTFASTDAC 17-108-00:41:06 /IDPULOAD VALUE=0x90
17-108-00:43:46 start idib_chg_thrshld(1, FRONT, FAST, 0x80) 17-108-00:43:49 /IDPUDUMPTABL TABLE=DIBTBL1 17-108-00:43:49 /IDPUTABLE1 OFFSET=FRONTFASTDAC 17-108-00:43:58 /IDPULOAD VALUE=0x80
17-108-00:45:22 start idib_chg_thrshld(1, REAR, FAST, 0x60) 17-108-00:45:26 /IDPUDUMPTABL TABLE=DIBTBL1 17-108-00:45:27 /IDPUTABLE1 OFFSET=REARFASTDAC 17-108-00:45:34 /IDPULOAD VALUE=0x60
17-108-00:49:52 start sc_ssr_rtime halted
Detectors 1, 3, 6 and 8 are on and working. There is a new active region on disk (AR2651) that produced a C-class flare this morning and will remain active for the next couple of days. So it was determined to keep the detectors 1 and 8 on unless there is an issue with the temperatures.
There was an explained attenuator change on 13 April 2017 at 13:55 UT. Albert's best guess is that this is (at least partially) corrupted data. At first glance, there is not any other explanation for why the front-decimation level could vary so wildly on short timescales, from minimal decimation to throwing out ~255/256 of counts. In the corresponding lightcurve plot one orbit earlier, the decimation level also appears to change during eclipse, which is weird as well. Further investigation is needed.
|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|
|Detector problems?||See notes above.|