Tohban Report 2013-04-17

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Tohban Reports
Start Date: 10 Apr 2013
End Date: 17 Apr 2013
Tohban: Hazel Bain
Tohban email:
Next Tohban: Juan Carlos Martinez Oliveros
List all reports


Solar Activity

Solar activity this week was moderate to high. A Major Flare Watch was called for AR 11719 after it produced an M6.5 flare. The region decayed somewhat after this, producing a number of C class events and is now due to rotate over the limb within the next 24 hours. There are currently 5 other active regions on the disk. The most active being 11723 which has produced a few C class flares in the last 48 hours.

How many GOES flares occurred?

 Flares above B, C, M, X class were      9    30     2     0

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

 Flares above B, C, M, X class were      4    23     2     0

And how many had EXCELLENT coverage?

 Flares above B, C, M, X class were      3    16     0     0

There were RHESSI flares/GOES flares 331 / 41 over the time range 10-Apr-13 17-Apr-13

Memory Management

The SSR was mostly emptying at the end of the daily passes during the beginning of the week.

Spacecraft Status

The cold plate 1 and 2 are at 115 K and 114 K respectively.

Data Gaps

There were several data gaps this week. The majority of which are now filled in.

Missing is a data from the 12th of April shortly before an M class flare.

GAP START TIME GAP END TIME GAP (SEC) 2013-04-12T20:00:00.000 -- 2013-04-12T20:30:00.000 1800.0000

Detector issues

Detector 9 is showing intervals of anomalous behavior, present from March 4th to 19th and beginning again around March 29th (There was also an episode around April 11th 2011). The intervals last for minutes at a time and sometime show up as two episodes per orbit. These short intervals appear as dips in the fast and slow rates but are actually fast oscillations in the monitor rates. The oscillations occur at the combination of the noon-to-dusk quarter and low latitudes. The oscillation has a period of ~4s, suggesting a coupling with the spacecraft rotation period. Possible suggestions for this behavior is a fluctuating high voltage or torque rods. Further investigation to follow.

Other notes

Spacecraft Management

Decimation Normal/vigorous
HLAT Decimation Rear decimation weight 6, no front decimation
Night time data (fronts) +/- 4 minutes
Night time data (rears) Taking data at nights
Require extra passes? No
Requirement for moving pointer? No
Attenuator operation Normal
Detector problems? No
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