solar spectrum


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solar spectrum

The Sun's spectrum extends from gamma-ray to radio wavelengths. It has an immense range in intensity, peaking at visible wavelengths. Although the central part of the curve varies little with solar activity, the long- and short-wavelength sections can be very considerably affected. The radiation intensity at visible and infrared wavelengths compares with that of a black body at a temperature of about 6000 K; the maximum intensity occurs at wavelengths of about 460 nm. This is the continuous spectrum of the photosphere in which absorption lines – Fraunhofer lines – appear. At the shortest and longest wavelengths, the solar spectrum corresponds to the radiation curve of a black body at about a million kelvin, which is representative of the temperatures of the corona and of solar flares. At ultraviolet and soft X-ray wavelengths the spectrum does not agree with either of these black-body curves. See also flash spectrum.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

solar spectrum

[′sō·lər ′spek·trəm]
(astrophysics)
The spectrum of the sun's electromagnetic radiation extending over the whole electromagnetic spectrum, from wavelengths of 10-9 centimeter to 30 kilometers.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

solar spectrum

The bandwidth of radiant energy—from long wave to short wave. It consists of radio waves, microwaves, visible light (red and violet), ultraviolet rays, X rays, and gamma rays. See electromagnetic spectrum.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
After discovering that there was no existing technology that suited their purpose, the researchers set about creating a coating that covered the solar spectrum and functioned from a variety of angles as the sun moved across the sky.
1, the intermediate structure consisting of an absorber-emitter pair, which is the key component for the solar thermal photovoltaic technology, is specifically designed to have spectral selectivity: the absorber's absorption spectrum should cover the entire solar spectrum, while the long-wavelength radiation should also be suppressed to reduce the system's radiation loss; the emitter's radiation spectrum should be higher (but could not be too much higher) than the bandgap wavelength (to avoid extra thermalization loss).
Caption: Coating could enable panels to capture a wider range of the solar spectrum
In order to simulated the effect of the dust on the solar cells, a preliminary experimental study must be done to calculate the solar spectrum under a dusty glass, A piece of glass with surface of 10x10 [cm.sup.2] and 3 mm of thickness is used as sample bearer of the dust studied.
While it is highly IR-reflective, it is extremely opaque in the visible and UV parts of the solar spectrum. The inertness means that it can be used in a wide range of coatings and plastics and have excellent weathering properties.
12 September 2017 - Recently merged US-based solar power companies Horizon Solar Power and Solar Spectrum have inked definitive agreements for two business acquisitions, the companies said.
Solar Spectrum, a company that provides technology-driven solar energy solutions to residential and commercial customers, has merged with Temecula, California-based Horizon Solar Power.
Masdar Institute said the novel product, developed in partnership with the Massachusetts Institute of Technology (MIT), absorbs nearly 100 per cent of the sunlight's energy from the ultraviolet and visible portions of the solar spectrum.
While the photo-catalytic degradation of dyes has been investigated for several decades, it is only relatively recently that researchers have developed materials capable of absorbing the visible part of the solar spectrum - other materials, such as titanium dioxide, are also able to break down dyes using solar energy, but their efficiency is limited as they only absorb higher energy, ultra-violet light.
Identification of improvements in solar cells often involves comparison of how those cells respond to a standard solar spectrum. Different locations have different amounts of ozone, water vapor, aerosols, and clouds, which can all affect the solar spectrum reaching the surface of the Earth (Fig.
The major disadvantage of thin film cells is the relatively poor absorption of light, particularly in the infrared part of the solar spectrum. Therefore, efficient light trapping structures are required in order to increase the light absorption length in the thin cell.
The predicted reflectance is below 10% over a wide portion of the solar spectrum. Another benefit of nanostructures is their wide acceptance angle.