Abstract
We present digital pictures of an active region network cell in five quantities, measured simultaneously: continuum intensity, line-center intensity, equivalent width, magnetogram signal, and magnetic field strength. These maps are derived from computer analysis of circularly polarized line profiles of FeI λ 5250.2; spectral and spatial resolution are 1/40 A and 1.5″, respectively. Measured Zeeman splittings show the existence of strong magnetic fields (1000–1800 G) at nearly all points with a magnetogram signal exceeding 125 G. The mean and rms deviation of the field strengths change by less than 20% over a factor-of-four range of fluxes. From the significant disparity between measured fluxes and field strengths, we conclude that large flux patches (up to 4″ across) consist of closely-packed unresolved filaments. The smallest filaments must be less than 0.7″ in diameter. We also observe the dark component of the photospheric network, which appears to contain sizable transverse fields.
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