SEVAN Detector Measurements at BEO Moussala and Lomnicky Stit: First Experience from 2014-2017

At Basic Environmental Observatory (BED) Moussala (2925 m a.s.l.) and at Lomnicky stit (LS) (2634 m a.s.l.) there are now working similar detector systems of the Space Environmental Viewing and Analysis Network (SEVAN) type. Using data from overlapping period (2014 - 2017) we estimate the barometric pressure coefficient for various channels of SEVANs and for various seasons. For thunderstorm periods the short time increases at SEVANs corresponding to the local high electric field, and most probably being the thunderstorm ground enhancements (TGE) events, are presented. Similarities and differences in the responses of SEVAN to thunderstorm events at the two sites are discussed. In what follows we examine the comprehensive meteorological data from the LS and BEO Moussala mountain observatories in comparison with Global data to answer the question: is there support for the hypothesis that CR contribute significantly to the local climate, by way of enhanced cloud cover?