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Total record count: 6269.

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	Eng ID	Term	Definition
	2561	inversion layer	Atmospheric LAYER, horizontal or approximately so, in which the temperature increases with increasing HEIGHT. See TEMPERATURE INVERSION.
	2562	inverted compass	See COMPASS: HANGING.
	2563	inverted image	See IMAGE.
	2564	inverting eyepiece	See EYEPIECE: ERECTING.
	2565	ionosphere	That part of the ATMOSPHERE, extending from about 70 to 500 km, in which ions and free electrons exist in sufficient quantities to reflect... more That part of the ATMOSPHERE, extending from about 70 to 500 km, in which ions and free electrons exist in sufficient quantities to reflect ELECTROMAGNETIC WAVES.
	2566	ionospheric disturbance	A sudden outburst of ultraviolet light on the sun, known as a Solar Flare, which produces abnormally high ionization in the region of th... more A sudden outburst of ultraviolet light on the sun, known as a Solar Flare, which produces abnormally high ionization in the region of the D-layer. The result is a sudden increase in radio wave absorption, with particular severity in the upper medium and lower high frequencies. It has negligible effects on the heights of the reflecting/refracting layers and, consequently, upon critical frequencies, but enormous transmission may occur.
	2567	ionospheric storm	Violent changes in the state of the IONOSPHERE.
	2568	ionospheric wave	See WAVE: SKY.
	2569	ironbound	(adj.). Said of a rugged, rocky COAST which affords no ANCHORAGE.
	2570	irradiance (at a point of a surface)	Quotient of the FLUX of RADIATION incident on an infinitesimal element of surface containing the point under consideration, by the area of t... more Quotient of the FLUX of RADIATION incident on an infinitesimal element of surface containing the point under consideration, by the area of that element.
	2571	irradiation (at a point of a surface)	Product of an IRRADIANCE and its duration.
	2572	irregular error	See ERROR: ACCIDENTAL.
	2573	island	A piece of LAND completely surrounded by water.
	2574	island harbour	See under HARBOUR.
	2575	island shelf	See CONTINENTAL SHELF.
	2576	island slope	See CONTINENTAL SLOPE.
	2577	isle	An ISLAND. Now more usually applied to an ISLAND of smaller size, except in established appellation, as the 'British Isles'.
	2578	islet	A small ISLAND.
	2579	isobar	Line joining points of equal pressure on a given surface (level surface, vertical cross section, etc.).
	2580	isobath	See DEPTH CURVE, FATHOM LINE.
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