Virtual Gravity
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Virtual Gravity
</dt>
The force of gravity on an
atmospheric parcel, reduced by centrifugal
force due to the motion of the parcel relative to the earth. The virtual
gravity g* is g* = g = V^{2}/a - 2Ω_{n}V , where g is the magnitude of the acceleration of
gravity; V is the parcel speed; a is the earth's radius; and Ω_{n} is the component of the earth's angular velocity
vector normal to the motion of the parcel.
</dd>
For reasonable atmospheric values, the correction terms are of the
order of 0.01 percent of the magnitude of gravity. The identity of g* and g is
implied by the assumption of hydrostatic equilibrium. [[/a>|/a>
]]
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use