Solar active region physical parameters inferred from a thermal cyclotron line and soft X-ray spectral lines

Details Solar active region physical parameters inferred from a thermal cyclotron line and soft X-ray spectral lines Solar active region physical parameters inferred from a thermal cyclotron line and soft X-ray spectral lines

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...322.1044l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 322, Nov. 15, 1987, p. 1044-1051. Research supported by the Lockheed Indepe

Astronomy and Astrophysics

Astronomy

29

Coronal Loops, Radio Astronomy, Solar Activity, X Ray Astronomy, Astronomical Maps, High Resolution, Solar Magnetic Field, Solar Maximum Mission, Solar X-Rays, Very Large Array (Vla)

Scientific paper

The authors present simultaneous high-resolution observations of coronal loops at 20 cm wavelength with the VLA and at soft X-ray wavelengths with the SMM FCS. The results show that 20 cm VLA maps can image X-ray coronal loops. The X-ray spectral lines are used to infer an average electron temperature of about 2.6±0.1×106K and an average electron density of 3.1±0.3×109cm-3. These parameters are used to show that the layers emitting 20 cm radiation can be optically thick to either thermal bremsstrahlung or thermal gyroresonance radiation. The detection of a linelike feature in the radio spectrum indicates that gyroresonance absorption exceeds free-free absorption. This feature is attributed to a thermal cyclotron line. The X-ray values for Te and Ne are combined with plausible values for gyroresonant optical depth and the magnetic scale height to show that the 20 cm radiation is probably at the fourth harmonic of the gyrofrequency.

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