The Sun is the source of most of the energy on Earth and the power source for life and plants, the cause of most of phenomena and happenings like flow of atmosphere and of water, the source of the warmth which makes life possible. In the other word is the source of all of Energies we need in future as renewable energy. Sun as a black body illuminates a wide range Electromagnetic radiation we know it as Solar Radiation.
Electromagnetic radiation is the flow of energy at the universal speed of light through free space or through a material medium in the form of the electric and magnetic fields that make up electromagnetic waves such as radio waves, Visible light, and gamma rays. In such a wave, time-varying electric and magnetic fields are mutually linked with each other at right angles. Electromagnetic radiation, including X-rays, ultraviolet and infrared radiation, and radio emissions, as well as visible light, emanating from the Sun.
Of the 3.8 * 10E33 ergs emitted by the Sun every second, about 1 part in 120 million is received by its attendant planets and their satellites. The small part of this energy intercept by our Planet Earth.
We can capture and convert solar radiation into useful forms of energy, such as electricity, heat and recently as we consider Chemical compounds, using a variety of technologies. The technical feasibility and economical operation of these technologies at a specific location depends on the available solar radiation or solar resource.
Always I ask myself that How much of the sunlight total energy can receive by Earth, it means what percentage of the sun's total sunlight or energy does the earth receive during a day?
We knew that our Sun rays spread out in every direction, and we are 93 million miles away from it. Out of all of the sunlight that the sun produces the answer is absolutely interesting, it is shocking to you, is about one part in 2.2 billion of the radiation emitted by the sun.
The percentage of sunlight that passes through the atmosphere varies with wavelength. In visible wavelengths, most light gets through the atmosphere.
Receiving visible light Irradiation by the Earth surface is Base of life. None would exist without it in the earth.
Our humankind life as all of other creatures in the earth is visible light based. I want to discuss more about it here and later in next posts we study more about it.
Incident solar radiation is a vital parameter for estimation of solar energy harvesting and it is defined as:
The amount of solar radiation striking a surface per unit of time and area.
We just can entrap a part of this striking light with or material. The trapping of light inside a semiconductor material by refracting and reflecting the light at critical angles; trapped light will makes further electrical changes in the material, greatly increasing the probability of absorption and hence of producing charge carriers.
## The Encyclopedia of Renewable Energy and Sustainable Living
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