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Section S S index 651-659 of 1376 terms
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solar signal—Electromagnetic energy from the sun measured by a radar and used as a reference signal for calibration. The solar signal may also be regarded as noise when a radar beam scans across the sun or when it interferes with communications. See sun pointing.
solar spectrum—That part of the electromagnetic spectrum occupied by the wavelengths of solar radiation. The shape is well represented by the continuum emission from a blackbody with temperature near 5700 K superimposed with Fraunhofer absorption lines.
solar–terrestrial relationships—The statistical or physical links between events that occur on the sun and a response observed on the earth, primarily in the atmosphere.
solar tide—A partial tide, with a period of 12 hours, caused by the tide-producing force of the sun. See solar atmospheric tide.
solar–topographic theory—The theory that the changes of climate through geologic time (the paleoclimates) have been due to changes of land and sea distribution and orography combined with fluctuations of solar radiation of the order of 10%–20% on either side of the mean. Topographic changes may account for the occurrence of ice ages as a whole, but not for the more rapid alternations of glacial and interglacial periods. A combination of the topographic with the solar fluctuations seems to offer a nearly complete explanation of climatic changes, but it is not yet clear which plays the main part.
solar wind—Stream of ionized gas, mainly hydrogen, continuously flowing outward from the sun, at very high velocity (≈ 400 km s−1 on the average) and with variable intensity. While passing near the earth the solar wind interacts with the magnetic field to produce various effects in the upper atmosphere (e.g., aurora).
Solar X-ray Imager—(Abbreviated SXI.) An imager designed to observe the sun�s x-ray emissions providing earth detection and location of flares, loops, coronal holes and coronal mass ejections from the sun that are important for forecasting space weather. The SXI instrument captures a full disk solar image every minute. First flown on the GOES-12 satellite, this device will be included on the GOES-R series of satellites.
solar zenith angle—Angle measured at the earth's surface between the sun and the zenith.
solarimeter—1. A pyranometer developed by W. Gorczyński, consisting of a Moll thermopile shielded from the wind by a bell glass. 2. Name sometimes used as a generic term in place of pyranometer.
solaure—Same as solore.
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