摘要: Spectroheliograms, obtained in certain Fraunhofer lines with the 82-cm solar image at Kitt Peak National Observatory, show a bright photospheric network having following properties: (1) It resembles, but does not coincide with, chromospheric network, structure of being finer and more delicate than relatively coarse network. (2) It is exactly cospatial non-sunspot magnetic fields. (3) Its visibility given line primarily dependent on states ionization excitation from which formed secondarily Zeemansensitivity line-being most visible low-excitation neutral atoms least high-excitation singly ionized atoms.
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