Tohban Report 2014-09-10

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Tohban Reports
Start Date: 3 Sep 2014
End Date: 10 Sep 2014
Tohban: Lindsay Glesener and Juan Camilo Buitrago Casas
Tohban email:
Next Tohban: Nicole Duncan
List all reports


Solar Activity

The Sun was moderately active this week. Of particular note was a long-duration M flare on Sept. 9, which caused a Major Flare Watch to be called, and on Sept 10 an X class flare took place. Enhanced activity is expected to continue in the upcoming days, since the two largest flaring regions (12157 and 12158) are still on the disk.

How many GOES flares occurred?

 Flares above B, C, M, X class were      0    37     3     0

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

 Flares above B, C, M, X class were      0    26     3     0

And how many had EXCELLENT coverage?

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

There were RHESSI flares/GOES flares 446 / 40 over the time range 03-Sep-14 10-Sep-14

UPDATE: Plus an X-class flare that took place just before the Ops meeting!

Memory Management

We have been in Active/Vigorous decimation all week, and are retaining nighttime events. Extra passes were put in over the weekend in order to ease the SSR fill. We were almost emptying before the M flare, which added a large fill since it was a long-duration flare. The max SSR fill was 40%. UPDATE: Just before the Ops meeting, nighttime events were turned off except for plus/minus 5 minutes.

Spacecraft Status

Spacecraft systems are nominal. Cold plate temps are 124.2K and 122.9K, down a bit from last week, as expected with the orbit precession. Attenuator motion was nominal.

Data Gaps

No significant data gaps.

Detector issues

Detector 9: still sporadic noise, though not often.

Detector 2: light leak. Raise thresholds? Other detectors seem ok with light leak now.

There were no threshold changes this week.

Spacecraft Operations

Decimation was changed from Normal/Vigorous to Active/Vigorous on Sept 3 at 14-246-18:46:15.

Other notes

NuSTAR performed its first solar pointing on Sept 10 at ~21:40 UT, observing for parts of the next 2.5 hours. Since the X class flare was still decaying in an AR near disk center, this swamped NuSTAR with counts. A future NuSTAR solar pointing would have called off this observation window due to high solar activity (NuSTAR is designed for low rates only), but this first observation is immensely useful in learning how to process and manipulate NuSTAR solar data.

Decimation Active/Vigorous
HLAT Decimation Rear decimation weight 6, no front decimation
Night time data (fronts) 5 minutes at start and end
Night time data (rears) 5 minutes at start and end
Attenuator operation Active
Detector problems? Noise in 9, light leak in 2
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