Tohban Report 2015-04-01

From RHESSI Wiki

Revision as of 15:58, 1 April 2015 by JuanCamiloBuitragoCasas (Talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search


Tohban Reports
Start Date: 25 Mar 2015
End Date: 01 Apr 2015
Tohban: Milo Buitrago-Casas
Tohban email: milo@ssl.berkeley.edu
Next Tohban: Lindsay Erin Glesener
List all reports



Contents

Solar Activity

Solar activity was rather low during last days. There were not a single M or X class flare, but we sporadically saw several C-class flares. Currently there is only one active region on the disk close to the East limb that will go out of disk in one day and a half days. Solar activity is expected to be low during the following days.

How many GOES flares occurred?

 Flares above B, C, M, X class were      9    42     0     0

And how many of these are listed in the RHESSI flare list?

 Flares above B, C, M, X class were      8    35     0     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 370 / 51 over the time range 24-Mar-15 31-Mar-15


Memory Management

The SSR was oscillating rawly between 10 and 35% all the week. Currently we are in an Active/Vigorous decimations but due to the low solar activity we recommend to the next Tohban to change it to Normal/Vigorous. Nevertheless it is recommended to keep a close eye on the SSR mainly because some thresholds of the detectors were changed during last days.

Spacecraft Status

Several changes were set on detector thresholds and high voltages last week. In general all detectors are stable but detector 9 was set at the maximum threshold allowed and at very low value of the high voltage. Also Detector 6 is showing a high value on the front slow count rates. All the other detectors are working well as far as the Tohban can tell.

A cryocooler experiment was carried out last Monday March 30. The current cryocooler power is at 74W (it was 71W until last week). We hope to discuss today

Data Gaps

There was no significant data gaps.

Temperatures

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 [G5] 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 front fast and front slow were changed today January 7, 2015 at 14:09 UTC.

Threshold [G7] Front Fast Front Slow
Initial 0x2E 0x10
Final 0x22 (nominal value) 0x0C (nominal value)

Only detectors 2 and 4 continue unsegmented.

Light leak in D2 front, D9 rear and D5 rear.

Other notes

Spacecraft Management

Decimation Active/Vigorous
Night time data (fronts) full nighttime events
Night time data (rears) full nighttime events
Require extra passes? No
Requirement for moving pointer? No
Attenuator operation Normal
Personal tools
Namespaces
Variants
Actions
Navigation
Toolbox