Very large array observations of solar active regions. III - Multiple wavelength observations

Details Very large array observations of solar active regions. III - Multiple wavelength observations Very large array observations of solar active regions. III - Multiple wavelength observations

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...267..455l&link_type=abstract

Astrophysical Journal, Part 1, vol. 267, Apr. 1, 1983, p. 455-464.

Astronomy and Astrophysics

Astrophysics

55

Photosphere, Solar Activity, Solar Corona, Solar Magnetic Field, Solar Radio Emission, Very Large Array (Vla), Brightness Temperature, Centimeter Waves, Coronal Loops, H Alpha Line, Hot Electrons

Scientific paper

Very Large Array maps of the active regions AR 2505 and AR 2646 at wavelengths 2 cm, 6 cm, and 20 cm are presented and compared with off-band H-alpha photographs. The 20 cm emission is interpreted in terms of the bremsstrahlung of coronal electrons trapped within magnetic loops; the maximum occurs near the central apex or top of the loop, as would be expected from a hydrostatic coronal loop. The 6 cm emission is interpreted in terms of the gyroresonant emission of thermal electrons spiralling in the legs of magnetic loops. A height of (3.5 + or - 0.5) x 10 to the 9th cm above the solar photosphere is inferred for the 6 cm emission. The 2 cm emission is interpreted in terms of either gyroresonant emission in the low solar corona or bremsstrahlung in the transition region. The 2 cm hot spots may be transitory phenomena related to H-alpha brightenings or flares, or they may mark the legs of warm loops.

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