Noun
The movement of something (such as a vehicle, structure, or charged particles) from its intended course or position due to outside forces.
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A very close approximation to the geographic drift excursion in a resonant gravity field of a 24-hour satellite follows the differential equation of motion, Equation 2, (see also Reference 2) and is, evidently, given by an elliptical integral such as that developed in Appendix E of Reference 3.
A collision changes the detailed nature of the particle orbit in a time which is very short compared to the time required to traverse magnetic field scale lengths, thus producing a step across flux surfaces the size of the orbit drift excursion away from the flux surface .
The bidirectional drift excursion for the beam-column joint is applied in the anticlockwise direction as per the numbering sequence illustrated in Figs. 8a and 8b.