flux density(redirected from flux densities)
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1. (spectral flux density or, strictly, spectral power flux density) Symbol: S . A measure of the strength of the signal received from a discrete source of emission. The dimensions of flux density are energy per unit time per unit bandwidth per unit area. The unit is the jansky.
2. See magnetic flux density.
flux density[′fləks ‚den·səd·ē]
Any vector field whose flux is a significant physical quantity; examples are magnetic flux density, electric displacement, gravitational field, and the Poynting vector.