On the influence of the Sun on the rapid variability of compact extragalactic sources N. Marchili, T. P. Krichbaum, X. Liu, H.-G. Song, J. M. Anderson, A. Witzel and J. A. Zensus A&A, 530 (2011) A129 Published online: 24 May 2011 DOI: 10.1051/0004-6361/201016033