Abstract
New results and the confirmation of some older suggestions concerning the nature of solar microwave Neutral Line associated Sources (NLSs) were obtained by using data acquired with the Nobeyama Radioheliograph at 17 GHz along with coronal magnetic field magnetograms extrapolated from full-disk longitudinal magnetograms. The used method of extrapolation is applicable for active regions with rather arbitrary position on the solar disk, and allows us to avoid projection effects in observed longitudinal magnetograms. An application of this method was demonstrated for the period of 2003 October–November. We found NLSs to be widespread at 17 GHz. The NLSs are located just above, or in close vicinity to, the inversion line of the radial component of the coronal magnetic field in the place of a close contact of opposite magnetic polarities, where a horizontal magnetic component has local maxima. We briefly address the birth, motions of NLSs, their transformations into sunspot-associated sources, and vice versa. We also add a set of observational facts in evidence for the presence of 17 GHz NLSs in active regions, which produce powerful flares.
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