Convergence

Integration of computing, communications and broadcasting systems.

A contraction of a vector field; the opposite of divergence. Convergence in a horizontal wind field indicates that more air is entering a given area than is leaving at that level. To compensate for the resulting "excess," vertical motion may result: upward forcing if convergence is at low levels, or downward forcing (subsidence) if convergence is at high levels. Upward forcing from low-level convergence increases the potential for thunderstorm development (when other factors, such as instability, are favorable). Compare with confluence.

An atmospheric condition that exists when the winds cause a horizontal net inflow of air into a specified region.

1. In a tristimulus color monitor (i.e., CRT) that employs phosphors excited (driven) by one or more electron beams, the process of controlling the beam(s) to ensure that the individual phosphors representing the color elements within each pixel are properly driven so that (a) within a given pixel there is a proper color balance to ensure the illusion of white, and (b) there is no spillover to adjacent pixels, causing false colors. 2. An analogous process applied to other types of color displays; e.g., a projection system using three spatially separated monochromatic CRTs, each generating a different color, and in which the three projected color images are superimposed on the projection screen, by means of off-axis optics, to achieve the illusion of white. 3. The calibration process performed to achieve the required proper color balance. 4. The result of such a calibration process, or the degree to which the ideal result is achieved.