Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...228..616j&link_type=abstract
Astrophysical Journal, Part 1, vol. 228, Mar. 1, 1979, p. 616-623.
Astronomy and Astrophysics
Astronomy
2
Microwave Interferometers, Millimeter Waves, Radio Astronomy, Solar Instruments, Solar Radio Emission, Chromosphere, Diffraction Patterns, Solar Limb, Time Response
Scientific paper
Results are reported for observations of a quiet region at the center of the sun with an interferometer operating at a wavelength of 8.33 mm and with an east-west baseline giving a maximum angular resolution of 28 arcsec. It is found that strong fluctuations occur over time scales of approximately 10 to 30 min and dominate the data at large hour angles, that smaller and more rapid fluctuations in both amplitude and phase are detected at all hour angles, and that the strong fluctuations are consistent with those that may be produced by the natural time variation of the fringe pattern during observation of a fixed source distribution. The weaker and more rapid fluctuations are tentatively attributed to antenna-tracking variations and the observation of features in a greatly extended source. The results are compared directly with those of two other interferometric studies of the quiet sun at millimeter wavelengths.
Janssen Michael A.
Lang Kenneth R.
Olsen Edward T.
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