Multiband VLA Observations of Solar Active Regions: Implications for the Distribution of Coronal Plasma

Details Multiband VLA Observations of Solar Active Regions: Implications for the Distribution of Coronal Plasma Multiband VLA Observations of Solar Active Regions: Implications for the Distribution of Coronal Plasma

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...466.1039v&link_type=abstract

Astrophysical Journal v.466, p.1039

Astronomy and Astrophysics

Astronomy

7

Sun: Activity, Sun: Corona, Sun: Radio Radiation

Scientific paper

We present high-quality radio observations of a solar active region (NOAA/USAF region 5131) made by the Very Large Array in the 0.33, 1.5, 4.7, and 8.4 0Hz frequency bands. The observations were made during the IAU-sanctioned International Solar Month on 1988 September 1 and 4. In addition to the radio maps, the database includes images from the Solar Maximum Mission Soft X-ray Polychromator in the Fe XVII line, photo spheric magnetograms, and Hα filtergrams. Because coverage in only a single wavelength is available, the soft X-ray data are used for qualitative comparisons.
We identify those areas of the active region from which the radio emission is predominantly due to thermal bremsstrahlung emission. To account for the observed four-point radio spectra in these areas, we examine three different models, which characterize the corona in terms of a single plasma component, two components, and multiple components. The latter differs somewhat from past models. In particular, we take explicit account of the highly inhomogeneous structure of active regions through a multilayer slab model in which the thermal distribution is constrained by the generic form of the differential emission measure. While multicomponent models provide the best agreement with the observations, we find that a complete model must include both free-free and gyroresonance opacity. We compare our radio data and model results with those resulting from previous studies.

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