Two-dimensional model maps of flaring loops at cm-wavelengths

Details Two-dimensional model maps of flaring loops at cm-wavelengths Two-dimensional model maps of flaring loops at cm-wavelengths

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..307p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 1, p. 307-314.

Astronomy and Astrophysics

Astrophysics

24

Centimeter Waves, Coronal Loops, Microwave Emission, Solar Flares, Two Dimensional Models, Circular Polarization, Maps, Solar Radio Bursts, Synchrotron Radiation, Very Large Array (Vla)

Scientific paper

We present a complete set of model computations of the microwave emission from a flaring loop. Two-dimensional maps in total intensity and circular polarization are given, as a function of wavelength, heliocentric distance and the orientation of the loop with respect to the direction of the limb. In agreement with our previous one-dimensional computations, the emission in the optically thin case comes from the one or both feet of the loop, with the primary maximum usually at the diskward side; in the optically thick case the emission comes from the entire loop, with one or two maxima near the top. We discuss in detail the effects of the orientation of the loop, as well as the polarization structure produced by self-absorption and gyroresonance absorption. The latter produce a patchy structure in the V map, with regions polarized both in the extraordinary sense (in the upper part of the loop) and in the ordinary sense (in the lower part of the loop). Finally we compare our computations with high spatial resolution observations of simple bursts.

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