Coronal magnetograms of solar active regions

A series of coronal magnetograms, related to the active region NOAA 9068 is derived using the effects of the quasi-transverse (QT-) propagation at microwaves. In the assumption that the product of the electron density N and the scale of magnetic divergence Ld is constant and equal to 10 18 cm −2 , the sensitivity of the measurements peaks at B(G) ≈ 180 λ −4/3 (cm), where λ is the observational wavelength. The radio maps of the Sun taken with the Solar Siberian Radio Telescope (SSRT) at λ =5 .2 cm were sampled and converted into the 2D coronal magnetograms supplying absolute values of the total magnetic vector � B in the range 10 - 30 G. Each coronal magnetogram covers the portion of the mic…