Category: Define

Echo The energy return of a radar signal after it has hit the target. Radar Acronym for RAdio Detection And Ranging. An electronic instrument used

Day Considered a basic unit of time as defined by the earth’s motion. It represents the time needed for one complete revolution of the earth

Ecliptic The sun’s apparent path across the sky that tracks a circle through the celestial sphere. Celestial Sphere The apparent sphere of infinite radius having

Eddy A small disturbance of wind in a large wind flow, which can produce turbulent conditions. They can also be areas of warmer air north

Debris Cloud Considered a rotating cloud of debris or dust that is on the ground or near the ground. The debris cloud appearing beneath a

Electromagnetic Radiation Also called radiation, it is waves of energy propagated though space or through a material media. Radiation The process by which energy is

Degree A measure of temperature difference representing a single division on a temperature scale.Related terms: Celsius, Fahrentheit, and Kelvin Temperature The measure of molecular motion

Electromagnetic Spectrum The band of electromagnetic radiation with components that are separated into their relative wave lengths. The portion of the spectrum that the human

Density The ratio of the mass of a substance to the volume it occupies. In oceanography, it is equivalent to specific gravity and represents the

Elevation The measure of height with respect to a point on the earth’s surface above mean sea level. Sometimes referred to as station elevation. Mean