Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986nascp2442..257l&link_type=abstract
In NASA. Goddard Space Flight Center Coronal and Prominence Plasmas p 257-261 (SEE N87-20871 13-92)
Astronomy and Astrophysics
Astronomy
Brightness Distribution, Brightness Temperature, Coronal Holes, Solar Corona, Synoptic Measurement, Radio Astronomy, Radio Emission, Solar Limb, Solar Physics, Spectroheliographs
Scientific paper
The Mark III Nancay Radioheliograph is used to observe the Sun at 169 MHz with a time resolution of 25 East-West and North-South images per second. When the brightness distribution of the Sun is stable during the eight hours of daily observation, a two dimensional map can be produced using the technique of earth rotation synthesis. The best images are obtained during the period April to August, when the declination of the Sun is high to give a good coverage in the uv plane and a reasonable North-South resolution. The spatial resolution is 1.5' East-West and in summer, 3.5' North-South. The maps are calibrated using Cygnus A as a reference. Examples of the maps are given and discussed.
Alissandrakis Constantine E.
Lantos Pierre
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