Accepted Manuscript Study of persistent fog in Bulgaria with Sofia Stability Index, GNSS tropospheric products and WRF simulations Anastasiya Stoycheva, Ilian Manafov, Keranka Vassileva, Guergana Guerova PII: S1364-6826(17)30025-1 DOI: 10.1016/j.jastp.2017.06.011 Reference: ATP 4613 To appear in: Journal of Atmospheric and Solar-Terrestrial Physics Received Date: 23 January 2017 Revised Date: 15 May 2017 Accepted Date: 22 June 2017 Please cite this article as: Stoycheva, A., Manafov, I., Vassileva, K., Guerova, G., Study of persistent fog in Bulgaria with Sofia Stability Index, GNSS tropospheric products and WRF simulations, Journal of Atmospheric and Solar-Terrestrial Physics (2017), doi: 10.1016/j.jastp.2017.06.011. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.