Tohban Report 2013-05-08: Difference between revisions

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<Cryocooler>
On April 25, during passes at 03:30 UT and 05:30 UT, a rebalancing of the cryocooler was performed as a measure to lower the power consumption and the overall increase trend in temperature. However, increasing/decreasing of both amplitude and phase of the balancer only led to vibration increase. The amplitude and phase of the balancer were put back to original values.
Brian reported further changes in state-of-health plots.  Since last week, the Sun fraction has increased to peak at 0.71 and the Cold Plate 2 temperature has decreased to 111 K. This is to be compared with 106.5 K at the time of the previous similar peak in the Sun fraction that occurred about Feb. 10. So there has been a 4.5 K increase in about 2.5 months or about 20 K per year. The accelerometer reading has stayed constant just below 16 mg for the last week or so.
Next course of action would be to rebalance with finer steps and to adjust both amplitude and phase simultaneously.
<Gamma Ray Burst>
RHESSI detected a large GRB event at 07:47 UT of April 27. An initial report can be found in the Nugget article by Andre Csillaghy and David Smith ([http://sprg.ssl.berkeley.edu/~tohban/wiki/index.php/A_huge_gamma-ray_burst]).




Revision as of 18:09, 8 May 2013


Tohban Reports
Start Date: 01 May 2013
End Date: 08 May 2013
Tohban: Lindsay Glesener
Tohban email: glesener@ssl.berkeley.edu
Next Tohban: TBA
List all reports



Solar Activity

There was a decent amount of activity this week, at least compared to recent months. There are currently 8 active regions on the disk. The most active this week was AR 11739, which spit out an M5 flare just after rotating onto the disk (on the 3rd) and many more C-flares with an occasional M in the days following. It's now in the center of the disk but has decayed significantly, so is no longer so active. I would expect that solar activity will continue at its current level (occasional C flares, nothing big).

How many GOES flares occurred? 

 Flares above B, C, M, X class were      7    61     4     0

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

 Flares above B, C, M, X class were      5    39     4     0

And how many had EXCELLENT coverage? 

 Flares above B, C, M, X class were      4    24     3     0

There were RHESSI flares/GOES flares 380 / 72


Memory Management

Spacecraft Status

Data Gaps

There was no data gap this week.


Detector issues

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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