Discover Solar Energy, a comprehensive resource of more than 9,000+ renewable energy
to relevant websites of individuals, governments and organizations.   
The links are c
ross-referenced  to help homeowners, engineers, hobbyists, teachers
and students
find quick answers  to issues relating to alternative energy
Contact us with your comments, suggestions or to report bad links. Thanks!


HOME    Contact Us    Solar Energy    Wind Energy    Ocean Power    Energy Storage    Living Green    Fuels (BioEnergy)    Systems     
Self-Sufficient Living   
Green Transportation    Research & Reference     LINK to DSE / Link Exchange 

What is Solar Energy?
Solar Energy Basics  -  Passive Solar - Photovoltaic
Solar Cooking -  Solar Sails - Solar Radiation - Solar ThermalGeothermal

        Videos:  Geothermal - Photovoltaic - Solar Energy - Solar Thermal       




What is "Solar Radiation"?
Last Updated on:  06/25/2015 06:31 AM

Solar Cell Circuits  Solar Monitor Circuits

Solar radiation describes the visible and near-visible (ultraviolet and near-infrared) radiation emitted from the sun. The different regions are described by their wavelength range within the broad band range of 0.20 to 4.0 m (microns). Terrestrial radiation is a term used to describe infrared radiation emitted from the atmosphere. The following is a list of the components of solar and terrestrial radiation and their approximate wavelength ranges:

  • Ultraviolet: 0.20 - 0.39 m

  • Visible: 0.39 - 0.78 m

  • Near-Infrared: 0.78 - 4.00 m

  • Infrared: 4.00 - 100.00 m

Approximately 99% of solar, or short-wave, radiation at the earth's surface is contained in the region from 0.3 to 3.0 m while most of terrestrial, or long-wave, radiation is contained in the region from 3.5 to 50 m.

Outside the earth's atmosphere, solar radiation has an intensity of approximately 1370 watts/meter2. This is the value at mean earth-sun distance at the top of the atmosphere and is referred to as the Solar Constant. On the surface of the earth on a clear day, at noon, the direct beam radiation will be approximately 1000 watts/meter2 for many locations.

The availability of energy is affected by location (including latitude and elevation), season, and time of day. All of which can be readily determined. However, the biggest factors affecting the available energy are cloud cover and other meteorological conditions which vary with location and time.

Historically, solar measurements have been taken with horizontal instruments over the complete day. In the Northern US, this results in early summer values 4-6 times greater than early winter values. In the South, differences would be 2-3 times greater. This is due, in part, to the weather and, to a larger degree, the sun angle and the length of daylight.

source EPLAB

Please suggest additional links      


Solar Radiation Links


Please suggest additional links       

HOME    Contact Us    Solar Energy    Wind Energy    Ocean Power    Energy Storage    Living Green    Fuels (BioEnergy)    Systems      
Self-Sufficient Living  
Green Transportation    Research & Reference    LINK to DSE / Link Exchange     Privacy Policy

Copyright 2000-2013   All rights reserved.
Please note that does not endorse or sponsor the external sites listed on this site. 
We do not
attest to the accuracy of the information given on these external sites. 
Any trademarks are the property of their respective owners.