A right circular cylinder with a magnetizable surface on which digital data can be stored and retrieved.

[A] magnetic representation of residual information remaining on a magnetic medium after the medium has been cleared. [INFOSEC-99]

A perturbation of the Earth's magnetic field, caused by solar disturbances, usually lasting for a brief period (several days) and characterized by large deviations from the usual value of at least one component of the field.
Note: Magnetic storms can affect radio propagation because they disturb the ionosphere.

1. A tape with a magnetizable surface on which data can be stored and retrieved.
2. A tape or ribbon of any material impregnated or coated with magnetic or other material on which information may be placed in the form of magnetically polarized spots. [JP1]

The combined effect of the Earth's magnetic field and atmospheric ionization, whereby a linearly polarized wave entering the ionosphere is split into two components called the ordinary wave and the extraordinary wave.
Note: The component waves follow different paths, experience different attenuations, have different phase velocities, and, in general, are elliptically polarized in opposite senses.

See magneto-optic effect.

Any one of a number of phenomena in which an electromagnetic wave interacts with a magnetic field, or with matter under the influence of a magnetic field.
Note: The most important magneto-optic effect having application to optical communication is the Faraday effect, in which the plane of polarization is rotated under the influence of a magnetic field parallel to the… (Read More →)

Synonym spamming. See flooding, spam.

An entry in a domain name system database that directs the routing of mail by mail transfer agents. [After Bahorsky]

Part of an e-mail delivery system that allows a message to be automatically and efficiently delivered to a list of addresses, thus implementing mailing lists. [After Bahorsky] Synonym exploder.