| Section C | C index | 301-309 of 1157 terms |
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chun fung—(Chinese for “spring wind.”) In China, a spring breeze; pleasant weather at the start of the spring season.
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chunyuh—In northern China, rain during the early spring that helps the winter wheat. There is a Chinese proverb: Chunyuh is as valuable as oil.
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churada—A severe rain squall in the Mariana Islands (western Pacific Ocean) during the northeast monsoon. They occur from November to April or May, especially from January through March.
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cierzo—In Spain, local term for the mistral in the lower valley of the Ebro. It occurs mainly in the autumn and early winter. Compare cers.
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circular depolarization ratio—(Abbreviated CDR.) The ratio of power received in the transmission channel to power received in the orthogonal channel of a dual-channel radar when a circularly polarized signal is transmitted. Because the stronger component of the circularly polarized signal backscattered from hydrometeors has a polarization orthogonal to the transmitted polarization, the circular depolarization ratio yields a value less than unity or, equivalently, a negative decibel quantity. Note that relative to the receiver channels of the radar, the circular depolarization ratio is defined inversely to the linear depolarization ratio. Compare cancellation ratio.
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circular polarization—A polarization state of an electromagnetic signal in which the electric field vector at a point in space describes a circle. Relative to an observer looking in the direction of signal propagation, the electric fields of right and left circularly polarized signals rotate clockwise and counterclockwise, respectively.
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