Date: Mon, 15 Mar 1999 23:16:32 -0800
From: "John H. DuBois III" <[EMAIL PROTECTED]>
The solar irradiation above the atmosphere is about 1.4Kw/m^2, compared to
about 1Kw/m^2 at the equator at noon on a clear day. At 90km, you're above
most of the atmosphere. So, there's more light, but I don't know how much of
the extra light is IR & UV.
John
On Mon, Mar 15, 1999 at 11:24:37AM -0500, Andrew Davidhazy wrote:
> Date: Mon, 15 Mar 1999 08:13:51 -0800
> From: "Hutsell, David D" <[EMAIL PROTECTED]>
>
> The "brightness" of the sun is the same as it is here on the surface of earth.
> Based on the inverse square law the exposure wouldnt increase untill you were
> several million miles closer to the sun. Contrast is high because of no fill,
> however if you are flying above a cloud layer this provides an excellent fill
> with high sun angles
>
>
> Dave Hutsell
> Lead, Still and Instrumentation
> Photography
> 425-393-7610/425-393-0201 fax
> Pager: 206-986-5213
> [EMAIL PROTECTED]
>
> > ----------
> > From: Andrew Davidhazy[SMTP:[EMAIL PROTECTED]]
> > Reply To: [EMAIL PROTECTED]
> > Sent: Tuesday, March 09, 1999 3:18 PM
> > To: [EMAIL PROTECTED]
> > Cc: [EMAIL PROTECTED]
> > Subject: How bright
> >
> > Date: Tue, 09 Mar 1999 14:58:16 -0800 (PST)
> > From: Tim Mickleburgh <[EMAIL PROTECTED]>
> >
> > Does anyone know the brightness of direct sunlight at an altitude of 90km,
> > or direct me to a suitible resource? Any thoughts on contrast at that
> > altitude would be helpful also - I am assuming that the only "fill" for
> > shadows is going to be reflectance from the surface of the Earth.
> >
> > Thanks,
> > Tim Mickleburgh, Primex Aerospace
> >
> >
--
John DuBois [EMAIL PROTECTED] KC6QKZ http://www.armory.com./~spcecdt/
