Solar atmospheric tide

solar atmospheric tide

An atmospheric tide due to the thermal or gravitational action of the sun.

Six- and eight-hour components of small amplitude have been observed. They are primarily thermal in origin. The 12-hour component has by many times the greatest amplitude of any atmospheric tidal component, about 1.5 mb at the equator and 0.5 mb in mid-latitudes. This relatively large amplitude is often explained as a resonance effect. The 24-hour component is a thermal tide with great local variability.

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(Also called atmospheric oscillation.) Defined in analogy to the oceanic tide as an atmospheric motion of the scale of the earth, in which vertical accelerations are neglected (but compressibility is taken into account).