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.

Attenuators

Spacecraft Management

Decimation	Active/Vigorous
Night time data (fronts)	None nighttime events
Night time data (rears)	None nighttime events
Require extra passes?	No
Requirement for moving pointer?	No
Attenuator operation	Normal