On the influence of the Sun on the rapid variability of compact extragalactic sources

Details On the influence of the Sun on the rapid variability of compact extragalactic sources On the influence of the Sun on the rapid variability of compact extragalactic sources

2011-03-22

arxiv.org/abs/1103.4245v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

10 pages, 12 figures and 2 tables. Accepted for publication in Astronomy and Astrophysics

Scientific paper

Starting from December 2004, a program for the monitoring of intraday variable sources at a frequency of 5 GHz was performed at the Urumqi Observatory. The analysis of the variability characteristics of the flat-spectrum radio source AO 0235+164 revealed the existence of an annual cycle in the variability amplitude. This appears to correlate with the solar elongation of the source. A thorough analysis of the results of the MASIV IDV survey --- which provides the variability characteristics of a large sample of compact radio sources --- confirms that there is a small but detectable component of the observed fractional modulation which increases with decreasing solar elongation. We discuss the hypothesis that the phenomenon is related to interplanetary scintillation.

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