Other
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...292..291h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 292, May 1, 1985, p. 291-296.
Other
16
Coronal Loops, Cyclotron Radiation, Microwave Emission, Solar Radio Emission, Thermal Radiation, Brightness Temperature, Plasma Diagnostics, Polarization (Waves), Solar Magnetic Field, Solar Wind, Stellar Models
Scientific paper
The thermal cyclotron emission from model dipole magnetic loops is computed. It is shown that a simple, isothermal dipole loop can show a great deal of spatial and polarization structure at microwave frequencies. This structure is sensitive to the observation frequency and angle of observation. Two qualitatively distinct microwave loop structures can be distinguished: (1) 'thin loop,' observed as a string of independent microwave peaks, corresponding to different harmonics of the local electron gyrofrequency; and (2) 'thick loop,' the harmonics are merged, so that a more continuous microwave structure is observed. It is shown that the presence of an external plasma can result in a change in the observed mode of polarization along one leg of a loop, without a change in the sign of the line-of-sight magnetic field. Models such as these, along with high-resolution microwave and related observations, can provide an excellent diagnostic of the magnetic and plasma properties of coronal loops.
Holman Gordon D.
Kundu Mukul R.
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