Always respecting the lack of knowledge of the measurand, let's say that it is possible that the pro may have suffered from lateral solar radiation due to the low angle of elevation of the sun.
the fact that the siap does not suffered from it does not mean that it is exempt from it, it will have to be evaluated as the angles vary over time
the problem certainly exists and cannot be ignored, we simply need to verify its extent and variations over time
M.
You take route "A", I'll take route "B", because when there are two Barani at the same time, one of whom suffers from the pheomene seen at Marco's, you can't be 100% sure that it's the Barani in this case.
The context is identical to what I've observed at home: high night-time humidity, early radiation, autumn, little wind.
If Marco received the Siap in the spring, he must have experienced the same phenomenon.
At the time you didn't believe in my 'theory', but since all my sensors have been modified, this phenomenon hasn't appeared and hasn't for 2 years. I think you're familiar with my set-ups and seeing the photos, you won't find any Colson's, taps, sensors too low, too high, non-perpendicular set-ups, etc... I even have double sensors to detect errors, which is how my SHT45s were 'validated'.
As I'm even lower than Marco, if solar flare were the only cause, the phenomenon would be almost invisible in my area and those to the north would have to deal with it more strongly.
I'm not saying that the phenomenon of low sun doesn't exist, but I am saying that certain SHT set-ups amplify the phenomenon when the conditions are right: nocturnal humidity, low sun, onset of radiation.
For the anecdote, I've been interested in humidity with my AQI detectors where you learn a lot about humidity and Portugal (centre) is a humid region, certain reactions are amplified.
Obviously humidity doesn't interest amateurs, but whether you like it or not, humidity can change the temperature up or down and will influence measurements if the humidity isn't 'evacuated' naturally because it's trapped.
In Marco's case (I'm voluntarily excluding myself) we have a few certainties: low sun, little wind, early radiation and we have one uncertainty: the temperature is lower because of a lack of radiation on the shelter or because of an increase in humidity which lowers the temperature.
It's a pity that the problem is always in the same direction.
