Scanning the sun with a highly directional array

Christiansen, W. N.; Mathewson, D. S.

doi:10.1109/jrproc.1958.286723

Cited by 33 publications

(9 citation statements)

References 11 publications

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“…From a detailed study at 21 cm of bright regions with the grating interferometer, Christiansen, Warburton, and Davies (1957) were able to show that they had sizes from 3' to 10', that they lay in the solar atmosphere at an average height of about 25 000 km, and that they had peak temperatures of the order of 2 X 106 OK. These results were confirmed by two-dimensional observations with the crossed grating interferometer (Christiansen and Mathewson 1958).…”

Section: Introductionsupporting

confidence: 72%

The Radio Brightness Distribution on the Sun at 21 cm from Combined Eclipse and Pencil?Beam Observations

Krishnan¹,

Labrum²

1961

Aust. J. Phys.

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A study of the brightness distribution on the Sun at 21-cm wavelength on April 8, 1959, is described. High resolution observations were made of the partial eclipse on that day with a simple radiometer of high sensitivity. The brightness distribution of the uneclipsed Sun at the same wavelength was obtained using a cross-grating interferometer, which enabled the bright regions to be located accurately.

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Section: Introductionsupporting

confidence: 72%

The Radio Brightness Distribution on the Sun at 21 cm from Combined Eclipse and Pencil?Beam Observations

Krishnan¹,

Labrum²

1961

Aust. J. Phys.

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“…A new instrument, which combined the grating approach from Potts Hill with the Mills Cross principle conceived by Bernard Mills, was subsequently built at the Fleurs field station. Known as the 'Chris Cross', the telescope provided daily two-dimensional maps of the Sun with a resolution of 3 arc minutes from 1957 onwards (23). These maps were built up by scanning with a pencil beam to produce a 'raster scan' where the beam moved up one step at a time as the Sun went through successive grating lobes with the rotation of the earth.…”

Section: A French Interlude Then Fleurs and The 'Chris Cross'mentioning

confidence: 99%

Wilbur Norman Christiansen 1913 - 2007

Frater¹,

Goss²

2011

Hist. Rec. Aust. Sci.

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W. N. (?Chris') Christiansen was an innovative and influential radio astronomy pioneer. The hallmarks of his long and distinguished career in science and engineering, spanning almost five decades, were his inventiveness and his commitment to, and success with, large-scale projects. These projects were the outcome of his innovative skill as physicist and engineer. Paralleling this was his equal commitment to forging strong international links and friendships, leading to his election as Vice-President of the International Astronomical Union for the years 1964 to 1970, as President of the International Union of Radio Science, URSI, from 1978 to 1981, and subsequently as Honorary Life President in 1984, and as Foreign Secretary of the Australian Academy of Science from 1981 to 1985. Major subsequent developments in radio astronomy and wireless communications on the global scene stand as a legacy to Chris's approach to his work and to the development of those who worked with him.

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“…Another important type of partially-filled aperture antenna, to which only a brief reference can be made, is the cross-type of multielement interferometer developed and used by Christiansen [9]. Arrays using these principles have been built in Japan, France and the United States, as well as in Australia.…”

Section: Antennas With Partially Filled Aperturesmentioning

confidence: 99%

Radio telescopes

Findlay

1964

IEEE Trans. Antennas Propagat.

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Scanning the sun with a highly directional array

Cited by 33 publications

References 11 publications

The Radio Brightness Distribution on the Sun at 21 cm from Combined Eclipse and Pencil?Beam Observations

The Radio Brightness Distribution on the Sun at 21 cm from Combined Eclipse and Pencil?Beam Observations

Wilbur Norman Christiansen 1913 - 2007

Radio telescopes

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