Tohban Report 2014-03-05
| Tohban Reports | |
|---|---|
| Start Date: | 19 Feb 2014 |
| End Date: | 26 Feb 2014 |
| Tohban: | Nicole Duncan |
| Tohban email: | nicoleduncan@ssl.berkeley.edu |
| Next Tohban: | Mitsuo Oka |
| List all reports | |
Solar Activity
Solar activity increased through the week, especially in the past few days where we have many C-class events. There are currently 10 ARs on the disk, primarily populating the western disk. The most active region is 11991, just west of disk center. This region has a ~10% chance of an X-class event and is currently in a beta-gamma-delta configuration. Stereo-B shows 1 or 2 ARs that will rotate onto the disk later next week.
How many GOES flares occurred?
Flares above B, C, M, X class were 0 31 3 1
And how many of these are listed in the RHESSI flare list?
Flares above B, C, M, X class were 0 16 1 1
There were RHESSI flares/GOES flares 379 / 51 over the time range 25-Feb-14 04-Mar-14
Memory Management
The increased solar activity filled the SSR to a maximum ~30% over the weekend. During this time we emptied to ~12% at the end of the passes. We changed decimation to ACTIVE/VIGOROUS on Monday and added a few more passes to reduce the fill level. We're now at ~3% SSR. We are still taking rear events at night, with no fronts.
Spacecraft Status
The cold plate 1 and 2 are at 118 and 117K, putting them in the yellow zone.
Data Gaps
None
Detector issues
-HV commanding on D9r: The experimental decrease of D9 voltage yielded confusing results. The voltage reduction surprisingly increased the reset rates ( ~6500 to ~9000) in D9 without any noticeable change to D8. There was no issue when we lowered/raised HV on D9, and the reset rates returned to ~6500. It was decided to simply raise the thresholds on D6f, D8r and D9r.
-D9r threshold change: This also yielded confusing results when D9 rear fast valids shot up (10,000 --> 50,000) as a result of the increased threshold. Over the intervening week, the D9 rear fast valids have slowly come back down to ~5,000 with no additional commanding.
-D8r threshold change: fast valids dramatically decreased from 100,000 --> 1,000 counts. Within the past week its drifted back up to ~5,000 counts.
-D6f threshold change: fast rates dropped from 50,000 --> 5,000 due to the threshold change. But, in the past week its drifted back up to ~10,000 counts.
-D4 & D6 rear fast valids: No commanding was done to these segments, but their rear fast valids have risen to to ~1,000 --> 5,000 counts over the week, which is now comparable to D9r fast rates. Their lifetimes are ~93% and 98% respectively. These two detectors should be monitored by the next tohban.
-D9r spike: Feb 27, 12:21 UT. This was before the threshold commanding.
-D2 continues to show signs of segmentation, with rear events only dropping out during SAA and active rear reset rates at other times.
- To do this week: D6f commanding will be done ~Friday.
Spacecraft Management
2014/064: Battery 1 is at 80%, in the yellow.
2014/058 19:25 UTC: Threshold changes G6 front fast: 0x70 to 0x80 G8 rear fast: 0x45 to 0x60 G9 rear fast: 0x80 to 0x90
2014/062 21:51 UTC. Decimation change to Acive/Vigorous
| Decimation | Active/Vigorous |
| HLAT Decimation | Rear decimation weight 6, no front decimation |
| Night time data (fronts) | Disabled (4 minutes before and after eclipse) |
| Night time data (rears) | Enabled |
| Require extra passes? | Yes |
| Requirement for moving pointer? | No |
| Attenuator operation | Normal |
| Detector problems? | D4, D6, D8, D9 elevated rear count rates |