Dear Rolf,

Yes, I do have a bit of a problem with SUNH conversion to solar radiation
with Ver 4.0.2. If you are kind enough to let me have your version from
MS-Excel please.


Many thanks



Regards

William
----- Original Message -----
From: "Rolf Sommer" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, October 26, 2006 11:01 PM
Subject: Re: Sunshine hours - solar radiation


> Dear Constanze,
>
> Not being able to tell you more about how the weatherman software
processes
> sunshine hours - but why don't you do the calculations yourself? This can
be
> done in a simple MS-Excel spreadsheet using text-book knowledge. (If you
> want, I can send you my version.) Then you can also play around with some
> driving variables (e.g. albedo) yourself and do some site-specific
> calibration.
>
> Regards,
> Rolf
>
> > -----Original Message-----
> > From: DSSAT - Crop Models and Applications
> > [mailto:[log in to unmask]] On Behalf Of Constanze Böhmel
> > Sent: Thursday, October 26, 2006 14:17
> > To: [log in to unmask]
> > Subject: Sunshine hours - solar radiation
> >
> > Hello,
> >
> > I am about to model maize yields in Southern Germany. Unfortunately the
> > available weather data contains only sunshinehours. Although the
> > weatherman
> > in DSSAT v4.0.2.0 converts sunshinehours into solar radiation, the
> > result is
> > not satisfying at all. The calculated values for the solar radiation are
> > too
> > low.
> > My questions are if you can tell me, how the weahterman converts the
> > sunshinehours into solar radiation and which experiences you have made
> > with
> > this function.
> >
> > Constanze Böhmel
> > ________________________________________________________
> >
> > Constanze Böhmel
> >
> > University of Hohenheim
> > Institute for Crop Production and Grassland Research
> > Fruwirthstraße 23
> >
> > 70599 Stuttgart, Germany
> >
> > Tel.: ++49 711-459 22380
> >
> > Fax: ++49 711-459 22297
> >
> > E-Mail: [log in to unmask]
> > www.uni-hohenheim.de/pflanzenbau
>