Possible detection of thermal cyclotron lines from small sources within solar active regions

Details Possible detection of thermal cyclotron lines from small sources within solar active regions Possible detection of thermal cyclotron lines from small sources within solar active regions

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...89..103w&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 89, Nov. 1983, p. 103-113.

Physics

7

Coronal Loops, Cyclotron Radiation, Solar Activity, Solar Electrons, Thermal Emission, Bremsstrahlung, Brightness Temperature, Circular Polarization, Hot Electrons, Solar Magnetic Field, Solar Radio Emission, Sunspots, Very Large Array (Vla)

Scientific paper

Theoretical spectra of thermal cyclotron line emission from solar active regions are presented for two frequency bands available at the Very Large Array (VLA). VLA synthesis maps of three active regions at 1380, 1540, and 1705 MHz are then presented. The maps of two of these regions show significant changes in the brightness temperature within these narrow frequency ranges. The author shows that these changes may be attributed to thermal cyclotron line emission in small regions (θ = 10arcsec to 30arcsec) where the magnetic field is relatively constant with H = 125 - 180 G. An alternative interpretation, involving height-dependent variations in the physical conditions may also explain the changes in one of these regions. The potential to study coronal magnetic fields using VLA observations of cyclotron lines is also discussed.

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