Tohban Report 2015-04-15
| Tohban Reports | |
|---|---|
| Start Date: | 08 Apr 2015 |
| End Date: | 15 Apr 2015 |
| Tohban: | Milo Buitrago-Casas |
| Tohban email: | milo@ssl.berkeley.edu |
| Next Tohban: | Hazel Bain |
| List all reports | |
Solar Activity
Solar Activity was moderate during last week. Sun has been rather quiet during last couple of days with sporadic C-class flares. Currently there are three active regions on the solar disk. Particularly the AR2321 has a high probability to host a M or X class in the next couple of days.
How many GOES flares occurred?
Flares above B, C, M, X class were 15 35 2 0
And how many of these are listed in the RHESSI flare list?
Flares above B, C, M, X class were 4 18 2 0
And how many had EXCELLENT coverage?
Flares above B, C, M, X class were 0 0 0 0
There were RHESSI flares/GOES flares 70 / 52 over the time range 07-Apr-15 14-Apr-15
Memory Management
Generally speaking the SSR has had high values during last week oscillating between 25% and 50% and reaching a maximum value of 58% last Monday. That main problem with that high rate of filling was some noise presented in detectors 6 and 9. For today we have mitigate the noise on detector 9 increasing its front slow threshold. However, after some fruitless experiments on detector 6 we still have a high noise that introduce values of around 2800 on its valid front slow counts (just for reference well behaved detectors have values of 200-500). It is needed to take actions on detector 6 in order to avoid filling up the SSR.
Spacecraft Status
Normal as far as the Tohban can tell. It would be desirable to make a balance experiment soon.
Data Gaps
GAP START TIME GAP END TIME GAP (SEC) 2015-04-08T03:05:00.000 -- 2015-04-08T03:10:00.000 300.00000 2015-04-08T18:10:00.000 -- 2015-04-08T18:15:00.000 300.00000 NO GAPS IN APP_ID = 154 (VC1-PMTRAS) NO GAPS IN APP_ID = 102 (VC3-MONITOR RATES)
GAP START TIME GAP END TIME GAP (SEC) 2015-04-12T11:30:00.000 -- 2015-04-12T11:50:00.000 1200.0000 GAPS IN APP_ID = 154 (VC1-PMTRAS) WITH PACKET RATE LT 4
N_GAPS 1 GAP START TIME GAP END TIME GAP (SEC) 2015-04-12T11:30:00.000 -- 2015-04-12T11:45:00.000 900.00000 NO GAPS IN APP_ID = 102 (VC3-MONITOR RATES)
Temperatures
Temperatures were normal in our new escenario. It means
Cold Tip Temperature 1 = 109.3K Cold Tip Temperature 2 = 107.6K Cold Plate Temperature 1 = 131.8K Cold Plate Temperature 2 = 130.4K
Detector issues
On April 09 starting at 17:20 UTC we made a few changes to detector 6 and 8. We raised thresholds on the Front Fast D6, Front Slow D6 and Rear Fast D8.
| Threshold [G6] | Front Fast |
| Initial | 0x80 |
| Final | 0xA0 |
| Threshold [G6] | Front Slow |
| Initial | 0x0C |
| Final | 0x15 |
| Threshold [G8] | Rear Fast |
| Initial | 0x70 |
| Final | 0x80 |
On April 13 at 17:47UT we changed the Rear Fast threshold for detector 8:
| Threshold [G8] | Rear Fast |
| Initial | 0x80 |
| Final | 0x90 |
On Abril 14 starting at 14:06 UT we made the next changes on Detectors for detectors 6 and 9 that had very high values of the Front Slow valid counts.
| Threshold [G9] | Front Slow |
| Initial | 0x0C |
| Final | 0x1A |
| Threshold [G6] | Front Fast |
| Initial | 0xA0 |
| Final | 0xA8 |
| Threshold [G6] | Front Fast |
| Initial | 0xA8 |
| Final | 0xB0 |
| Threshold [G6] | Front Slow |
| Initial | 0x15 |
| Step 1 | 0x1A |
| Step 2 | 0x1F |
| Final | 0x15 |
| Threshold [G8] | Rear Fast |
| Initial | 0x90 |
| Final | 0xA0 |
Other notes
Because our current problem with noise on detector 6 and the increasing solar activity it would be desirable to ask for extra passes. The thin attenuator is IN, we should to figure it out how to unblock it.
Spacecraft Management
| Decimation | Active/Vigorous |
| Night time data (fronts) | None nighttime events |
| Night time data (rears) | None nighttime events |
| Require extra passes? | Yes |
| Requirement for moving pointer? | No |
| Attenuator operation | Normal |