Tohban Report 2018-01-17

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Tohban Reports
Start Date: 2018 January 10
End Date: 2018 January 17
Tohban: Pascal Saint-Hilaire
Tohban email:
Next Tohban: TBD
List all reports


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.


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.


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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