Tohban Report 2015-01-28

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Revision as of 17:12, 28 January 2015

Solar Activity

Solar activity is moderate to high and is picking up. There are 9 active regions on the disk, with 2-3 of them flaring. Many of these are coming from AR 12268 at disk center, including an M class flare. There is also a prolific AR rotating onto the disk; this AR produced many flares on its last turn on the merry-go-round and is already showing activity this time around.

These statistics are from Tuesday afternoon; I'll update on Wednesday afternoon.

How many GOES flares occurred?

 Flares above B, C, M, X class were     12    31     1     0

And how many of these are listed in the RHESSI flare list?

 Flares above B, C, M, X class were      6    21     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 229 / 44 over the time range 19-Jan-15 26-Jan-15

Memory Management

We're still in Normal / Vigorous decimation at the moment. A switch to Active / Vigorous mode has been requested. Due to increased activity in the past ~day, the SSR is no longer emptying.

Spacecraft Status

Data Gaps

No gaps this week as of Jan 27 (Tuesday).

Temperatures

Detector issues

• Rear fast counts were high again, so we raised the rear fast threshold by 16 steps, in two sets of 8, on the 2015-01-21 BGS pass starting at ~3:30 PST. The new value is 0x60 (was 0x50). Fast rates as eyeballed from the realtime data were approx 58,000 (pre-adjustment), 12,000 (after 8 steps up), and 1600 (after 16 steps up). Livetime percentages were approx 60%, 90%, and 98%, respectively.

 15-021-23:33:58 /idpudumptabl table=dibtbl9
 15-021-23:34:03 /idputable9 offset=rearfastdac
 15-021-23:34:34 /idpuload value=0x58

 15-021-23:36:47 /idputable9 offset=rearfastdac
 15-021-23:36:55 /idpuload value=0x60

• D6 has been showing some strange peaks in the spectrum; these are best seen as multiple lines (that drift) in spectrograms. On Monday, Jan 28 we raised the slow front threshold on D6 to ~10 keV and kept it there for a day before returning to the nominal ~3 keV. This is intended to see if the slow threshold affects the abnormal spectral lines. There has not been opportunity for the tohban to assess the results of this test; volunteers for that task would be appreciated.

 15-026-21:57:13 UTC / D6 front slow threshold to 0x30 (was 0x0C).
 15-027-21:36:37 UTC /  D6 front slow threshold to 0x0C (was 0x30).

• D6 fast rates are a bit high (have been rising slowly over the past week). It would be a good idea to raise the front fast threshold a touch. I didn't want to do this at the same time as the slow threshold experiment!

Other notes

Spacecraft Management

A spin-up was performed on Monday, Jan 26 from about 14.5 RPM to 14.97 between 20:29 and 22:06 UTC. There were no anomalies.