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Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
What about moisture causing intermittent conduction - tracking, sparks, arcs - from the anode terminal to a point of lower potential? This would cause Va to collapse momentarily, which would be registered as a count.
Registered Member #1938
Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 699
That is an interesting idea, however the humidity chart shows the device had much harder times the last week, without a negative impact on its data accuracy:
For the last month or so, we had bad weather, with the humidity value hitting its max value (99%). On the other hand, today it was a nice warm day, and humidity was as low as 55% RH.
So the air was reasonably dry, and the temperature at that hour (18 pm ) was too high for condense to take place, above 10 degrees celsius:
Unfortunately I can't figure this out. All the sensors show very reasonable values. Nothing seems abnormal, except the CPM data. And only for 6 minutes.. than its back to normal.
Having a malfunction would be the simplest explanation, I just can't see where this fits in the story, given all the other data.
Registered Member #1938
Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 699
The two links above point to real time data, so in case others will revisit this thread some time from now, I've also attached the static images: First is humidity, second is temperature, for the last 14 days.
Registered Member #1938
Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 699
:Product: Forecast Discussion :Issued: 2013 Feb 01 0030 UTC # Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center # *EXPERIMENTAL PRODUCT*
Solar Activity
.24 hr Summary... Two significant filament eruptions, at least one of which appears to be Earth-directed, were observed during the period. The first was visible in SDO AIA 304 imagery beginning at about 31/0439 UTC and lasting until 31/0725 UTC. This filament erupted from the southeast limb. A CME was subsequently visible in SOHO/LASCO C2 coronagraph imagery around 31/0800 UTC. Analysis suggests the CME had an Earth-directed component and was moving at approximately 550 km/s. No radio emissions were reported with this event. The second filament eruption occurred in the northeast quadrant. It was first observed in SDO AIA 304 imagery at 31/1543 UTC and lasted until 31/1742 UTC. We are awaiting coronagraph imagery to begin an analysis of this event. Otherwise, solar activity was low. Region 1663 (S09W18) produced an impulsive C1 x-ray event at 31/0434 UTC. Region 1663 displayed modest growth and development over the period, ending as the only bipolar region on the visible disk, a Cso type group with beta magnetic characteristics.
.Forecast... Solar activity is expected to be very low with a chance for C-class flares, probably from Region 1663.
Energetic Particle
.24 hr Summary... The greater than 2 MeV electron flux at geosynchronous orbit reached moderate levels. The greater than 10 MeV proton flux at geosynchronous orbit was at background levels.
.Forecast... The greater than 2 MeV electron flux is expected to be at normal to moderate levels. The greater than 10 MeV proton flux is expected to remain at background levels.
Solar Wind
.24 hr Summary... Solar wind at the ACE spacecraft was nominal. Wind speed was in the low to mid 300 km/s range. Bz values ranged between 5 and -5 nT and Bt values ranged from 1 to 4 nT. The sector orientation varied between negative and positive throughout the day.
.Forecast... A coronal hole is expected to become geoeffective beginning on day 2 (02 Feb) with wind speed increasing to 400 km/s. A preliminary WSA-ENLIL model run suggests a further increase to around 450 km/s is expected mid-day on day 3 (03 Feb) as the CME mentioned earlier scrapes by the magnetosphere.
Geospace
.24 hr Summary... The geomagnetic field was quiet.
.Forecast... A coronal hole is expected to become geoeffective beginning on day 2 (02 Feb) bringing a slight chance for unsettled to active geomagnetic conditions. A preliminary WSA-ENLIL model run suggests the CME mentioned above will arrive mid-day on day 3 (03 Feb) bringing unsettled to active conditions with a slight chance for minor storm conditions, particularly at high latitudes.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Do you remember a paper I sent you a few years ago about a Russian 256 tube GM array?
Apart from increasing the effective aperture, a GM tube array gives high immunity to false triggering when each tube is supplied by an independent anode supply, and parts of the array are configured in anti-coincidence mode, and other parts in coincidence mode.
A small array of 8 tubes configured as 4 pairs would give an excellent confidence interval compared with using only one. Even those crappy СИ 39Г would probably do OK in an array.
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