Tohban Report 2012-07-25
From RHESSI Wiki
| Tohban Reports | |
|---|---|
| Start Date: | 18 July 2012 |
| End Date: | 25 July 2012 |
| Tohban: | Hazel Bain |
| Tohban email: | hbain@ssl.berkeley.edu |
| Next Tohban: | Lindsay Glesener |
| List all reports | |
Contents |
Solar Activity
Solar activity has decreased this week due to AR 11520 rotating off the disk. However before it rotated out of view it produced one particularly nice M-class flare on the 19th of July. The solar background has now returned to low B-class level. There are currently 7 active regions on disk with STEREO B showing a couple of small active regions due to rotate onto the disk in the next few days.
How many GOES flares occurred?
Flares above B, C, M, X class were 9 13 1 0
And how many of these are listed in the RHESSI flare list?
Flares above B, C, M, X class were 5 11 1 0
And how many had EXCELLENT coverage?
Flares above B, C, M, X class were 2 2 0 0
There were RHESSI flares/GOES flares 97 / 23 over the time range 18-Jul-12 25-Jul-12
Memory Management
SSR is currently ~16%. Increased low energy counts from detector 8 on exiting the SAA are thought to have contributed to a higher than normal SSR fill level for the current solar activity. The HV on detector 8 was was lowered by 5 steps (193 to 188) at 206/20:25 UT to try and resolve this problem. An extra one day of AGO passes have been scheduled for July 26th to help empty the SSR.
Spacecraft Status
The cryocooler power was decreased from 78 W to 71 W at 2012-200-21:03:56 UTC. The accelerations dropped from ~17 mG down to ~12 mG and the cold tip temperatures rose by a few tenths, during the remainder of the pass. The cold plate 1 and 2 temperatures are currently at 107.3 K and 105.1 K respectively.
A spin up was completed at 203/15:40 UT.
Data Gaps
There were no significant data gaps this week (only two ~5 min gaps on the 20th and 21st).
Detector issues
Due to an excess of low energy counts coming out of the SAA, the HV on detector 8 was lowered by 5 steps, from 193 to 188 at 206/20:25 UT. The data following this change has not yet been downlinked to check whether this has resolved the problem.
Other notes
Spacecraft Management
| Decimation | Active/vigorous (as of day 184) |
| HLAT Decimation | |
| Night time data (fronts) | +/- 4 minutes |
| Night time data (rears) | +/- 4 minutes |
| Require extra passes? | Yes |
| Requirement for moving pointer? | No |
| Attenuator operation | Normal |
| Detector problems? | Detector 8 HV lowered by 5 steps (see above for details). |
