Tohban Report 2014-05-07
From RHESSI Wiki
|Start Date:||30 Apr 2014|
|End Date:||7 May 2014|
|Tohban:||Albert Shih (Vice Tohban: Brian Dennis)|
|Next Tohban:||Juan Carlos Martinez-Oliveros (Vice Tohban: Albert Shih)|
|List all reports|
Solar activity increased over the week, culminating in two M-class flares on 2014 May 6, one of which was observed well by RHESSI. The M-class flares came from active regions at the west limb.
How many GOES flares occurred?
Flares above B, C, M, X class were 12 35 2 0
And how many of these are listed in the RHESSI flare list?
Flares above B, C, M, X class were 4 20 2 0
And how many had EXCELLENT coverage?
Flares above B, C, M, X class were 1 8 1 0
There were RHESSI flares/GOES flares 265 / 49 over the time range 30-Apr-14 07-May-14
The SSR fill level reached a maximum of 28% during the week, with the SSR not being completely emptied after a full set of passes. The decimation mode was changed on 2014 May 1 from active/vigorous to normal/vigorous.
The spacecraft once again experienced spin-rate anomalies due to the orientation of the magnetic field that caused the ACS to switch to idle mode. The first time this week was noticed on a Santiago pass on May 2, and the spacecraft was commanded to precession mode. When next observed, the spacecraft had re-entered idle mode. Prior to commanding it to precession mode again, a spin-up was performed on May 3.
There were no data gaps, but there have been some spikes in the data, similar to those noted in last week's tohban report. In particular, the C-class flare on 2014 Apr 30 at ~0125 UT not only has visible spikes, but also the full-Sun quicklook image shows two sources, which suggests a problem with the aspect solution. These spikes appear to be correlated with potentially noisy downlinks from Wallops, but historically noisy downlinks manifest as dropouts rather than spikes. Furthermore, in this case, the data was replayed at Santiago. It is still an open question why there are spikes in the data and whether they are "real" in any way (as opposed to a data-processing issue).
Nothing beyond what is already discussed above.
Brian Dennis was an excellent vice tohban!
|HLAT Decimation||Rear decimation weight 6, no front decimation|
|Night time data (fronts)||+/- 4 minutes|
|Night time data (rears)||+/- 4 minutes|
|Require extra passes?||No|
|Requirement for moving pointer?||No|
|Detector problems?||4, 8, 9|