Physics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...85..267w&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 85, June 1983, p. 267-283.
Physics
37
Coronal Loops, Microwave Emission, Solar Activity, Solar Magnetic Field, Solar X-Rays, Astronomical Maps, Chromosphere, Circular Polarization, Filtergrams, Nonthermal Radiation, Photosphere, Spatial Resolution
Scientific paper
Coordinated high-resolution (1-3 arcsec) observations of two active solar regions (H 421 and H 419) on November 16, 1979, are reported: soft-X-ray filtergrams from a sounding rocket flight, VLA total-intensity and circular-polarization microwave (6-cm) radio maps, KPNO full-disk photospheric magnetograms, and BBSO H-alpha data. The images were converted to 4.8-arcsec/mm-scale transparencies and coaligned on the basis of sunspot positions for comparison. The two active regions are characterized in detail, and intensity, size, and polarization data for the brightest microwave components (BMC) are listed. It is found that 19 of the 32 BMC are farther than 5 arcsec from any sunspot, and that X-ray-emitting structures only rarely correspond to sunspots, or BMC. About one third of the BMC are located at the feet or legs of coronal loops smaller than about 50,000 km. The limitations implied by these obervations for proposed thermal-bremsstrahlung, thermal-gyro-resonance, and nonthermal microwave-emission mechanisms are discussed.
Davis Mark J.
Kundu Mukul R.
Velusamy Thangasamy
Webb David F.
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