# Re: intensity of solar light

From: On-line Snack discussion (snaktalk)
Date: Wed Jul 24 2002 - 18:45:07 PDT

A similar question came in recently. Here's the posting Re: Question?
from June 19, 2002:

Most of the web sites I looked at said it was 3.83 to 4 x 10^26. You might
find the following web sites interesting:
http://ircamera.as.arizona.edu/astr_250/Lectures/Lecture_12.htm
http://www.physics.fsu.edu/users/ProsperH/AST1002H/sun.htm
http://www.cosmiverse.com/reflib/sunpage1.htm

Nina Thayer
Snacktalk Moderator

Dear Sir,
Do you know what the power of the surface of the sun is in watts/m^2? I
took the power at the earths atmosphere of 1350 W/m^2 and multiplied by
R^2 where R is the distance of the Earth to the Sun for increase in
intensity. The result seemed very high of 3 x 10^25 W/m^2. With a
average photon energy of blue light I calculated meters/photon. The
spacing was 10^-22 meters, I thought it should be about 10^-14 meters.
Robert Kaukas

Nina Thayer
Snacktalk Moderator

> hi
> i would like to know the intensity of solar light(approximately) in W/m2
> unit.