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Section A A index 241-249 of 917 terms Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 Next aerodynamically smooth surface—A surface with irregularities sufficiently small to be entirely embedded in the laminar sublayer. Thus, the smoothness of a surface will depend on the Reynolds number. The irregularities are taken to be sufficiently dense and similar so that only the average height need be specified. A surface is aerodynamically smooth if where u* is friction velocity, z0 is aerodynamic roughness length, and ν is the kinematic viscosity of air. The critical Reynolds number is in the range of 2.5 ≤ Ref ≤ 70. Compare aerodynamically rough surface. aerodynamics—The study of the forces exerted on and the flow around bodies, especially aircraft, moving relative to a gas, especially the atmosphere. Aerodynamics is sometimes used as a synonym for the science of flight. aerogram—See thermodynamic diagram. aerograph—In general, any self-recording instrument carried aloft by any means to obtain meteorological data. See meteorograph. aerography—1. (Rare.) Same as descriptive meteorology. 2. (Rare.) The so-called nonprofessional work of meteorology: observing, map plotting, maintaining records, etc. aerologation—(Also called single-grid heading.) A method utilizing grid navigation to simplify flight problems attendant to pressure-pattern flight. A map projection is used in which the great circle course approximates a straight line, and a rectangular grid overlay is superimposed on the map projection and oriented along the central meridian of the projection. Then the great circle course makes equal angles with all north–south lines on the grid. When the net drift-correction angle is applied to correct for wind effect, the entire course may be flown on a single heading with respect to the rectangular grid overlay. Compare single drift correction. aerological analysis—The study of the physical state of the atmosphere derived from vertical sounding data plotted on thermodynamic diagrams. aerological days—Internationally agreed upon days designated for more detailed or intensive observations of the atmosphere over broad areas of the earth. aerological diagram—Same as thermodynamic diagram. aerological station—A surface location from which upper-air observations are made. Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 Next