V.L.A. Observations of Solar-Active Regions. I. The Slowly Varying Component,

摘要: Abstract : Very Large Array (V.L.A.) synthesis maps of the total intensity and circular polarization active region AR 2032 at 6 cm wavelength are presented compared with H alpha photographs Zeeman effect magnetograms same second-of-arc accuracy. The indicate that radio emission is dominated by a small (approx. 30 inches), bright (10 to 6th power K), circularly polarized (40% 100%) source whose detailed morphological features correlated chromospheric plage seen as regions on photographs. large brightness temperatures they coronal counterparts plage. enhanced exhibited substantial structural changes time scale one day, these were similar in Weak or undetectable was found directly overlying sunspots; but two 10 K) sources outer edges sunspot where magnetic field gradient large. Although degree varied from 40% 100% different dominant, plage-associated source, entire had polarity general structure longitudinal lower lying photosphere.