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Rapid fluctuations in pressure.

Related Terms

HUNTING

Fluctuation about a mid-point due to instability, as oscillations of the needle of an instrument about the zero point.

LABRADOR CURRENT EXTENSION

A name sometimes given to the nontidal current flowing southwestward along the northeast coast of the United States. This coastal current originates from part of the Labrador Current flowing clockwise around the southeastern tip of Newfoundland. Its speeds are fairly constant throughout the year and average about 0.6 knot. The greatest seasonal fluctuation appears to be in the width of the current. The current is widest during winter between Newfoundland and Cape Cod. Southwest of Cape Cod to Cape Hatteras the current shows very little seasonal change. The current narrows considerably during summer and flows closest to shore in the vicinity of Cape Sable, Nova Scotia and between Cape Cod and Long Island in July and August. The current in some places encroaches on tidal regions.

LUNAR INEQUALITY

1. Variation in the moon’s motion in its orbit, due to attraction by other bodies of the solar system. 2. A minute fluctuation of a magnetic needle from its mean position, caused by the moon.

FADING

The fluctuation in intensity or relative phase of any or all of the frequency components of a received radio signal due to changes in the characteristics of the propagation path. See also SELECTIVE FADING.

PANTING

The pulsation in and out of the bow and stern plating as the ship alternately rises and plunges deep into the water

SOPEP

Shipboard Oil Pollution Emergency Plan

OSCILLATION

1. Fluctuation or vibration to each side of a mean value or position. 2. Half an oscillatory cycle, consisting of fluctuation or vibration in one direction; half a vibration.

SECONDARY CONTROL TIDE STATION

A tide station at which continuous observations have been made over a minimum period of 1 year but less than a 19-year Metonic cycle. The series is reduced by comparison with simultaneous observations from a primary control tide station. This station provides for a 365-day harmonic analysis including the seasonal fluctuation of sea level.

S.O.I.

The Southern Oscillation Index is calculated from seasonal air pressure fluctuation differences between Tahiti and Darwin.

SOI

The Southern Oscillation Index is calculated from seasonal air pressure fluctuation differences between Tahiti and Darwin.
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