By Donald E. Billings
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Additional info for A Guide to the Solar Corona
Several special provisions are made for fast and convenient study of the spectrum of the corona. The slit of the spectrograph is curved so that the B. Coronagraphy 33 spectrum of almost 90° of solar limb can be observed with a single slit position. Through a stepped motion of the 0 2 lens the image of the sun can be moved across the slit in steps of various lengths. ) Simultaneously with the stepping of the solar image, the film also moves by an adjustable amount in front of a window of adjustable length.
Radio-Frequency Techniques 47 the position of the various lobes of the interferometer pattern on the sky, or the receiver may passively respond to the sun as it crosses the pattern in its daily motion. Similarly, if two dipoles are oriented to receive orthogonally-polarized signals, the phase of the coupling can be varied to analyze the characteristics of elliptical polarization in the radiation. Rather than enter into a more detailed consideration of the instrumentation of radio astronomy, we shall classify the assembled apparatus according to (1) whether it is a fixed-frequency or sweep-frequency apparatus, (2) whether it integrates the radiation of the entire corona, or whether it can resolve gross coronal features, and (3) whether it can or cannot discriminate one state of polarization from another.
In the bright ring of light surrounding the dark image of the occulting disk the corona itself is generally not apparent, since its light is only a small fraction of the light from the sky, the instrument, and the unocculted photospheric light. In the case of a simple objective lens and a small occulting disk the ring of light close to the occulting-disk image is generally colored, since those wavelengths of photospheric light for which complete occulting has taken place have been removed. 28 2.
A Guide to the Solar Corona by Donald E. Billings