Tohban Report 2017-01-25

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Tohban Reports
Start Date: 18 January 2017
End Date: 25 January 2017
Tohban: Martin Fivian
Tohban email:
Next Tohban: TBD
List all reports


Solar Activity

Two new active regions (12627, 12628) developed and are currently roughly speaking in the center of the solar disk.

However, the Sun was mostly quiet with a goes base level around B0. On January 21, three C-flares occurred with good RHESSI coverage.

The hsi_tohban_flare_counter is currently not working because the quicklook data processing doesn't recognize the flares.

Memory Management

Decimation was normal/vigorous for the full time period, with the SSR at about 0% at the end of each day's BGS contacts.

Spacecraft Status

On January 19, Detector 8 has been switched off and Detector 1 has been switched on.

Detectors 1 and 3 are recording events.

The Cryocooler power is steady at 75W. The cold tip and cold plate temperatures have come down with the sun fraction running through a maximum on January 21. The cold tips are currently at about 124 and 126K, and the cold plates are at about 147 and 148K. For details see:

The Attenuators logic has been re-enabled on January 23 because of increasing probability of flares around 50% for C-flares, 10% for M-flares and non-zero for X-flares.) Det 3 is used for the attenuator logic and the thresholds have been set to corresponding to a deadtime of 9%. The current deadtime Det.3 is about 5%. However, it's expected that the deadtime will slightly increase with decreasing sun fraction and rising detector temperatures.

Data Gaps


Detector issues


Spacecraft Management

Decimation Normal/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 logic enabled
Detector problems? See notes above.
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