The electric field produced by an electrostatic charge. [T1.308-1996]

Recording by means of a signal-controlled electrostatic field.
Note: Subsequent processing is usually required to make the image visible.

A barrier or enclosure that attenuates an electrostatic field. [T1.321-1995]

That type of recording produced principally by signal-controlled thermal action.

In facsimile transmission systems, any segment of a scanning line, the dimension of which along the line is exactly equal to the nominal line width.
Note: An elemental area is not necessarily the same as the scanning spot.

See unit interval.

An atmospheric duct consisting of a high-density air layer that starts at high altitudes and continues upward or remains at high altitudes, thus affecting primarily very-high-frequency (VHF) transmission. [From Weik '89]

Abbreviation for extremely low frequency.

Emergency Location Identification Number

Acronym for electronics intelligence.