uk.sci.weather (UK Weather) (uk.sci.weather) For the discussion of daily weather events, chiefly affecting the UK and adjacent parts of Europe, both past and predicted. The discussion is open to all, but contributions on a practical scientific level are encouraged.

 
 
LinkBack Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
  #14   Report Post  
Old April 23rd 18, 04:44 PM posted to uk.sci.weather
external usenet poster
 
First recorded activity by Weather-Banter: Jul 2003
Posts: 389
Default Cambell-Stokes sun recorder?

On 23/04/2018 12:43, Keith Harris wrote:
So it is true what Ole said, and the algarithm seems correct based on

the WMO definition of 120W/m2, which is very old...

I'm not sure that the age of the definition has much to do with it (is
it very old anyway?). Isn't the reality that sunshine hours is not
actually a well-defined parameter and can't be because what you're
trying to measure, ie the boundary between bright sun conditions and
not, is subjective. It's a different kind of parameter to eg temperature
or rainfall. So different measurement techniques inevitably give
different answers and probably always will.

The WMO definition is one approach and an appealing one because it
defines a threshold which can be accurately measured with the right kit.
But how well it parallels human feelings about what is bright sun,
especially in hazy or dawn/dusk conditions, is endlessly debatable.

I suppose an alternative definition could be built around just how sharp
a shadow might be, given modern sensors and image analysis software. But
even so, someone will still need to make the call about precisely where
the cutoff is to be made.



 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
InstroMet Sun recorder to Data logger wiring? Keith Harris uk.sci.weather (UK Weather) 6 December 23rd 17 12:28 PM
R&D Sunshine recorder - auto ftp sun duration Nick Gardner uk.sci.weather (UK Weather) 6 October 23rd 11 08:59 AM
Grass Minimum recorder ? Keith (Southend) uk.sci.weather (UK Weather) 9 November 11th 07 09:30 PM
Heads up - Lightning on BBC TV - set your recorder nickw7coc@gmail.com uk.sci.weather (UK Weather) 1 July 6th 06 10:04 AM
Sunshine recorder rhvp65@gmail.com sci.geo.meteorology (Meteorology) 0 June 5th 05 11:41 PM


All times are GMT. The time now is 12:48 PM.

Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004-2025 Weather Banter.
The comments are property of their posters.
 

About Us

"It's about Weather"

Copyright © 2017