On Sunday, 26 July 2020 08:55:08 UTC+10, Greg Troxel wrote: > > gjr80 writes: > > > Some folks derive field radiation from luminosity though I believe the > > relationship is somewhat complex. > > I'm not at all clear on what labels the various stations use. > > I would use "solar irradiance" or less pedantically "solar radiation". > The term "field radiation" is interesting and I have not previously > encountered it. > > You will notice the highlight on the word radiation (but not the word field) in my original post, this was in reference to the WeeWX field named radiation, not to something known as 'field radiation'.
> For the arriving light per unit area, the term is Illuminance. > Luminosity strictly refers to total power departing a light source. > > https://en.wikipedia.org/wiki/Solar_irradiance > https://en.wikipedia.org/wiki/Illuminance > > One cannot accurately convert illuminance to irradiance, because > illuminance applies wavelength-based weights to power based on human > visual response. So, two light sources arriiving at a surface, having > the same illuminance, will in general have differenrt irradiances. But > people assume "sunlight" and then onc can make a reasonable > approximation. > > My previous rant: > > https://github.com/weewx/weewx/wiki/Watts-and-lux > > and something I just found that seems interesting > > > https://ieee-dataport.org/open-access/conversion-guide-solar-irradiance-and-lux-illuminance > > > I don't disagree but irrespective the GW1000 API has no ability to return data that is suitable to be placed in the WeeWX field called radiation. If the user wishes to derive values to place in any WeeWX fields that of course is their call and whilst WeeWX has the machinery to do such things it is left as an exercise for the user. Gary -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/0ca7e6ae-39d5-4d9f-982b-6e487473a4d4o%40googlegroups.com.
