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Ein rauscharmet Empfänger in der Radioastronomie der Sonne

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Summary

A minimum-signal receiver has been set up to measure small fluctuations in the black radiation of the quiet sun. It has previously been almost impossible to use such receivers, because of the eleven-year sun-spot cycle, but signals from the quiet sun can now be received.

The system described here consists of a broad-band receiver, operating within the limits 500–1000 Mcs. This receiver operates like a well known Dicke comparison-radiometer, but it is more sensitive than the usual Dicke-system. The minimum detectable temperature in the frequency-region 500–1000 Mc is <10oK, if the receiver-bandwith is 2 Mc and the time-constant 1 sec.

For special cases the broadband receiver is used in conjunction with a parametricpreamplifier at a fixed frequency (610 Mc) The receiver-system is switched to a parabolaantenna having a broadband helixfeed.

Examples are given for radioastronomy-measurements of the sun including microbursts, oscillations of beginning radiobursts, and of noise comparison at different UHF-frequencies.

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Literaturverzeichnis

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Authors and Affiliations

  1. Astronomisches Institut der Universität Tübingen, Tübingen, Deutschland

    Gerhard Feix

Authors
  1. Gerhard Feix
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Jetzt an der Radiosternwarte der Universität Bonn.

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Feix, G. Ein rauscharmet Empfänger in der Radioastronomie der Sonne. Journal of Applied Mathematics and Physics (ZAMP) 15, 491–508 (1964). https://doi.org/10.1007/BF01601308

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  • DOI: https://doi.org/10.1007/BF01601308

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