High-resolution observations of the quiet sun at 6 centimeters using the Westerbork Synthesis Radio Telescope

Details High-resolution observations of the quiet sun at 6 centimeters using the Westerbork Synthesis Radio Telescope High-resolution observations of the quiet sun at 6 centimeters using the Westerbork Synthesis Radio Telescope

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234.1122k&link_type=abstract

Astrophysical Journal, Part 1, vol. 234, Dec. 15, 1979, p. 1122-1136.

Astronomy and Astrophysics

Astrophysics

20

Centimeter Waves, High Resolution, Limb Darkening, Radio Observation, Radio Telescopes, Solar Granulation, Autocorrelation, Brightness Temperature, Cross Correlation, Solar Atmosphere, Solar Instruments, Spectroheliographs

Scientific paper

High-spatial-resolution (∼6") observations of the quiet Sun were made at 6 cm with the Westerbork Synthesis Radio Telescope. A 10' × 10' field of the central disk region observed on 1976 June 16 was synthesized. We show the first radio map of the supergranulation network. Numerical autocorrelation of the radio map indicated a radio "network" width ∼11,000 km and a radio "cell" spacing ∼32,000 km. The brightness temperature of typical network elements is ∼2.5 × l04 K, while that of the radio cells is ∼1.5 × l04 K. The contrast between the radio network and cells is ∼1.7:1 which is intermediate to that of the Ca+ K network and Lα network. The radio map was compared with a Ca+ K spectroheliogram of the same region on the same day. On 1976 June 17, the four limbs of the Sun were also observed in an attempt to synthesize the limb and study the extent and symmetry of limb brightening. The results show that limb brightening is seen both in the north-south and east-west directions, contrary to earlier low-resolution measurements which showed limb brightening only in the east-west direction. The peak of the limb brightening appears ∼15" outside the white-light disk and the peak limb temperature is ∼40% greater than the mean disk temperature.

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