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First Edition Preface Second Edition Preface Acknowledgments
Section S S index 1341-1349 of 1376 terms
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sweep lengthFor a given radarscope, the maximum distance from the radar that is represented on the face of the scope. The sweep length, therefore, specifies the scale of the scope display.
sweep1. A single traversal of the electron beam along any coordinate axis on the face of a cathode-ray oscilloscope. 2. A single rotation of an antenna at fixed azimuth or elevation.
swellSurface gravity waves on the ocean that are not growing or being sustained any longer by the wind. Generated by the wind some distance away and now propagating freely across the ocean away from their area of generation, these waves can propagate in directions that differ from the direction of the wind, in contrast to a wind sea. See generating area.
SWIAbbreviation for severe weather threat index. See stability index.
SXIAbbreviation for Solar X-ray Imager.
sylphonSame as aneroid capsule.
sylvanshineAn optical phenomenon in which some species of dew-covered plants become strongly retroreflective. On a warm summer evening when a beam of light, such as car headlights, illuminates dew- covered trees, the scene is reminiscent of snow-covered trees in the moonlight. Four things must be present for the sylvanshine to be seen: the proper species of tree, the proper season of the year, dew-covered leaves, and a view looking directly down the beam of light illuminating the tree in an otherwise dark scene. The sylvanshine is closely related to the heiligenschein.
Fraser, A. B., 1994: The Sylvanshine: retroreflection in dew-covered trees. Appl. Optics, 33, 4539–4547.
symbolSee plotting symbols.
symmetric instabilitySimilar to inertial instability but caused by the imbalance between pressure gradient and inertial forces for infinitesimal disturbances that meridionally displace fluid along isentropes (in the atmosphere) or isopycnals (in the ocean). For geostrophic motion in the Northern Hemisphere, symmetric instability may occur only if the potential vorticity is negative.
symmetry pointIn meteorology, a point in a time series an equal distance on either side of which the rate of change of the element has the same magnitude but opposite sign.
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