Electromagnetic Spectrum

Electromagnetic Spectrum

. Radiation from the Sun and other cosmic objects is emitted at wavelengths from less than 10-12 meters too greater than 104 meters. The visible spectrum is a very small portion of the entire range of wavelengths. The lighter the shading, the greater the transparency of the Earth’s atmosphere. Solar radiation only penetrates to the Earth’s surface at visible and radio wavelengths, respectively represented by the narrow and broad white areas. Electromagnetic radiation at short X-ray and ultraviolet wavelengths, represented by the dark areas, is absorbed in our air, so the Sun is now observed in these spectral regions from above the atmosphere in Earth-orbiting satellites.

Copyright 2010, Professor Kenneth R. Lang, Tufts University