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Definitions (135)
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turbulent flow
Fluid motion in which random motions of parts of the fluid are superimposed upon a simple pattern of flow. All or nearly all fluid flow displays some degree of turbulence. The opposite is laminar flow.
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tec
See Total Electron Content.
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stirring
Striation(s): Subauroral Blob: Substorm: Sudden Ionospheric Disturbances: (SID) Complex combinations of sudden changes in the conditions of the ionosphere and the effects of these changes. Used for geomagnetic crotchets and SID (ionospheric disturbances).
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Spectral index
Sporadic E: A phenomenon occurring in the e region of the ionosphere, which significantly affects HF radiowave propagation. Sporadic E can occur during daytime or nighttime and it varies markedly with latitude.
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Sounding
Any penetration of the natural environment for scientific observation usually by sounding rockets or balloons. Used for sounders.
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slip velocity
Plasma drift relative to the neutral gas.
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Solar maximum
The month(s) during the solar cycle when the 12-month mean of monthly average sunspot numbers reaches a maximum. The most recent solar maximum occurred in July 1989.
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Solar minimum
The month(s) during the solar cycle when the 12-month mean of monthly average sunspot numbers reaches a minimum. the most recent minimum occurred in September 1986.
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Shock Waves
Surfaces or sheets of discontinuity (i.e., abrupt changes in conditions) set up in a supersonic fields of flow, through which the fluids undergo a finite decrease in velocity accompanied by a marked increase in pressure, density, temperature, and entropy, as occurs, e.g., in supersonic flows about bodies. Used for bow shock waves.
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Scattering
The process by which small particles suspended in a medium of a different index of diffraction diffuse a portion of the incident radiation in all directions. In scattering, no energy transformation results, only a change in the spatial distribution of the radiation. Used for scatterers.
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