Tohban Report 2015-01-07
From RHESSI Wiki
| Tohban Reports | |
|---|---|
| Start Date: | 31 Dec 2014 |
| End Date: | 7 Jan 2015 |
| Tohban: | Milo Buitrago-Casas |
| Tohban email: | milo@ssl.berkeley.edu |
| Next Tohban: | ? |
| List all reports | |
Contents |
Solar Activity
Solar activity was relative low with only 1 M class flare. There are currently 7 ARs on the disk, 2 are rotating off. There is 1 AR that has rotated on disk a couple of days ago, but it hasn't produced any major flare yet.
There were RHESSI flares/GOES flares 345 / 40 over the time range 23-Dec-14 30-Dec-14
Memory Management
Decimation was changed from Active/Vigorous to Normal/Vigorous. There were no changes on night time event collection this week.
Spacecraft Status
Data Gaps
There was no significant data gap.
Detector issues
On January 5 at 14:57 UTC we changed thresholds on the front fast and front slow values for detector five [G5].
| Threshold | Front Fast | Front Slow |
| Initial | 0x60 | 0x80 |
| Final | 0x2E (same as initial G7) | 0x10 (nominal value) |
During the changes we tried to set the front fast threshold to the nominal value (0x22), but monitor rate in that case showed a very high value (around 700). Then we decided to set the front fast threshold to the same value that G7 initially had. Threshold front slow value was well-set to nominal. After these changes, monitor rates on G5 looked stable and in accordance with the other well-behaved segmented detectors (i.e. 1,3,6,8, and 9). Next Tohban should specially keep an eye on the behaviour of this detector.
D7 changes have been scheduled to next Wednesday morning.
| Threshold | Front Fast | Front Slow |
| Initial | 0x2E | 0x10 |
| Final | 0x22 (nominal value) | 0x0C (nominal value) |
The other detectors looked still stable. Only detectors 2 and 4 continue unsegmented.
Light leak in D2 front, D9 rear and D5 rear.
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) | full nighttime events |
| Require extra passes? | No |
| Requirement for moving pointer? | No |
| Attenuator operation | Normal |
| Detector problems? | D2 front and D9 rear light leak. |
