Tohban Report 2018-01-17

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{{Infobox Tohban Report|
{{Infobox Tohban Report|
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|start_date = 27 December 2017
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|start_date = 2018 January 10
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|end_date = 3 January 2018
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|end_date = 2018 January 17
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|tohban_name = Jim McTiernan, Martin Fivian (Jan 2-3)
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|tohban_name = Pascal Saint-Hilaire
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|tohban_email = jimm@ssl.berkeley.edu
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|tohban_email = pascal@ssl.berkeley.edu
|next_tohban  = TBD
|next_tohban  = TBD
}}
}}
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== Solar Activity ==
== Solar Activity ==
-
Quiet...
+
Very quiet. A single flare above B level. GOES baseline is about A4 or A5.
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How many GOES flares occurred?
+
== Memory Management ==
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  Flares above B, C, M, X class were      2    0    0    0
+
-
And how many of these are listed in the RHESSI flare list?
+
-
  Flares above B, C, M, X class were      1    0    0    0
+
-
And how many had EXCELLENT coverage?
+
-
  Flares above B, C, M, X class were      1    0    0    0
+
-
There were RHESSI flares/GOES flares          2 /            2
+
SSR fill was at 0% at end of pass set. likely because we now have only two detectors on.
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over the time range 27-Dec-17 03-Jan-18
+
Max fill level was about 11% this week.
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== Memory Management ==
+
== Misc ==
 +
 
 +
The spacecraft clock was updated  to current time, it had drifted fast by about 8.5 seconds.  The command was sent 2018/010 22:34:24 UTC.
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Decimation was active/vigorous for the full time period, SSR fill was
 
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between 38.8 and 63.9%.
 
== Spacecraft Status ==
== Spacecraft Status ==
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Detectors 1, 3, 6, and 8 are recording events. The cold tips are 134.3
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Detectors 3 & 8 are on.
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and 132.5 K as of 27-Dec-2017. The cold plates, 1 and 2 are 160.0 and
+
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158.6 K.  Cryocooler power is 73.8W, cryocooler efficiencies are
+
-
0.0268 and 0.0272. See:
+
-
http://sprg.ssl.berkeley.edu/~ayshih/soh/latest_temperatures.pdf
+
See
 +
http://sprg.ssl.berkeley.edu/~ayshih/soh/latest_temperatures.pdf
for a summary plot of recent temperatures, efficiencies and
for a summary plot of recent temperatures, efficiencies and
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== Data Gaps ==
== Data Gaps ==
-
DATA GAPS FOR 27-dec-2017 TO 3-jan-2018
+
None of consequence.
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TIME RANGE: 2017-12-27T00:00:00.000 -- 2018-01-03T00:00:00.000
+
 
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GAPS IN APP_ID = 1 (VC1-SOH) WITH PACKET RATE LT 30
+
== Downlink issues ==
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N_GAPS          4
+
 
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GAP START TIME              GAP END TIME                  GAP (SEC)
+
Overall better, now that cryocooler power has been diminished. Still concerning, and we only have two detectors on. The issue seems to arise when the receiver temperature is high (we only have a combined transmitter/receiver temperature reading available to us). A temperature-dependent mechanical cut in the RF path?
-
2017-12-28T13:45:00.000 -- 2017-12-28T13:50:00.000      300.00000
+
-
2017-12-28T14:10:00.000 -- 2017-12-28T14:15:00.000      300.00000
+
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2017-12-29T13:45:00.000 -- 2017-12-29T13:50:00.000      300.00000
+
-
2018-01-02T10:05:00.000 -- 2018-01-02T10:15:00.000      600.00000
+
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GAPS IN APP_ID = 154 (VC1-PMTRAS) WITH PACKET RATE LT 4
+
-
N_GAPS          1
+
-
GAP START TIME              GAP END TIME                  GAP (SEC)
+
-
2017-12-28T14:10:00.000 -- 2017-12-28T14:15:00.000      300.00000
+
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GAPS IN APP_ID = 102 (VC3-MONITOR RATES) WITH PACKET RATE LT 30
+
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N_GAPS          1
+
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GAP START TIME              GAP END TIME                  GAP (SEC)
+
-
2017-12-27T05:45:00.000 -- 2017-12-27T05:55:00.000      600.00000
+
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== Detector issues ==
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For now, back to back downlinks have been removed to deal with the problem.
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Detectors 1, 3, 6, and 8 are powered on, and are recording events. No
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65W cyocooler since Jan 6th.
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threshold changes or HV changes this past week.
+
== Spacecraft Management ==
== Spacecraft Management ==
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| Attenuator operation || Nominal
| Attenuator operation || Nominal
|-
|-
-
| Ref. deadtime for Att.thresholds || 35.x%
+
| Ref. deadtime for Att.thresholds || 18.x%
|-
|-
| Detector problems? || See above
| Detector problems? || See above

Latest revision as of 19:50, 17 January 2018


Tohban Reports
Start Date: 2018 January 10
End Date: 2018 January 17
Tohban: Pascal Saint-Hilaire
Tohban email: pascal@ssl.berkeley.edu
Next Tohban: TBD
List all reports



Contents

Solar Activity

Very quiet. A single flare above B level. GOES baseline is about A4 or A5.

Memory Management

SSR fill was at 0% at end of pass set. likely because we now have only two detectors on. Max fill level was about 11% this week.

Misc

The spacecraft clock was updated to current time, it had drifted fast by about 8.5 seconds. The command was sent 2018/010 22:34:24 UTC.


Spacecraft Status

Detectors 3 & 8 are on.

See http://sprg.ssl.berkeley.edu/~ayshih/soh/latest_temperatures.pdf

for a summary plot of recent temperatures, efficiencies and accelerometer values.

Data Gaps

None of consequence.

Downlink issues

Overall better, now that cryocooler power has been diminished. Still concerning, and we only have two detectors on. The issue seems to arise when the receiver temperature is high (we only have a combined transmitter/receiver temperature reading available to us). A temperature-dependent mechanical cut in the RF path?

For now, back to back downlinks have been removed to deal with the problem.

65W cyocooler since Jan 6th.

Spacecraft Management

Decimation Active/Vigorous
HLAT Decimation Rear decimation
Night time data (fronts) plus/minus 4 minutes from daylight
Night time data (rears) plus/minus 4 minutes from daylight
Require extra passes? No
Requirement for moving pointer? No
Attenuator operation Nominal
Ref. deadtime for Att.thresholds 18.x%
Detector problems? See above
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