Observations of anomalous refraction at radio wavelengths

Details Observations of anomalous refraction at radio wavelengths Observations of anomalous refraction at radio wavelengths

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...184..381a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 184, no. 1-2, Oct. 1987, p. 381-385.

Mathematics

Logic

45

Radio Astronomy, Radio Frequencies, Radio Wave Refraction, Signal Reception, Anomalies, Frequency Distribution, Mathematical Models, Meteorological Parameters

Scientific paper

Anomalous refraction has been observed at millimeter wavelengths with the IRAM 30-m telescope, and at centimeter wavelengths with the Effelsberg 100-m telescope. During refraction 'events', radio sources are displaced by up to 40 arcsec, in both azimuth and elevation, for periods up to 30 s of time. More typically, sources are displaced by a few arcsec for a few seconds of time. The most likely explanation is in terms of moist air packets of a size comparable to the aperture, moving through the beam of the telescope. The effect is observed at high and low elevation angles, and does not require a long line of sight through the atmosphere, indicating that the moist air packets are in the lower troposphere. The effect is clearly dependent on meteorological conditions, such as temperature and humidity.

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