Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986nascp2442..291k&link_type=abstract
In NASA. Goddard Space Flight Center Coronal and Prominence Plasmas p 291-295 (SEE N87-20871 13-92)
Astronomy and Astrophysics
Astronomy
Brightness Temperature, Coronal Loops, Electron Density (Concentration), Electron Energy, Solar Activity, Solar Radiation, Antenna Arrays, Bremsstrahlung, Circular Polarization, Radio Astronomy, Resonance Fluorescence, Solar Magnetic Field, Sunspots, Very Large Array (Vla)
Scientific paper
Three dimensional structure of an active region is determined from observations with the Very Large Array (VLA) at 2, 6, and 20 cm. This region exhibits a single magnetic loop of length approx. 10 to the 10th power cm. The 2 cm radiation is mostly thermal bremsstrahlung and originates from the footpoints of the loop. The 6 and 20 cm radiation is dominated by the low harmonic gyroresonance radiation and originates from the upper portion of the legs or the top of the loop. The loop broadens toward the apex. The top of the loop is not found to be the hottest point, but two temperature maxima on either side of the loop apex are observed, which is consistent with the model proposed for long loops. From 2 and 6 cm observations it can be concluded that the electron density and temperature cannot be uniform in a plane perpendicular to the axis of the loop; the density should decrease away from the axis of the loop.
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