Аннотация:Baksan neutron monitor (NM) is placed in Baksan Neutrino Observatory on Northern Caucasus. It is placed at the floor of Baksan gorge and 1700 m above sea level. The place has 430 16’ 22.81” N and 420 41’ 06.04” E coordinates. Cosmic ray flux at the surface level depends on amount of matter above NM. It is
proportional to atmospheric pressure. This is a reason to fix the atmosphere pressure as fine as cosmic ray flux. Analysis of the data has shown there usually was a day pressure variation. Generating of pressure variations caused by local conditions (like a wind, local orography ect.) doesn’t have influence to cosmic ray flux because these variations free of matter amount change. It would be called
dynamic variations. A revealed pressure variation (about 1 mb) is synchronous to cosmic ray variation. We consider it to be special orographic effect spreading to significant part of the troposphere with
changing amount of matter of NM. In this case NM is like an matter amount detector and shows real changing of matter amount above NM.