Barometric coefficients for different neutron multiplicities according to ESA NM data (Israel) and data of University "Roma Tre" NM (Italy)

On the basis of hourly data obtained by neutron monitor (NM) of Emilio Segre' Observatory (height 2025 ma bove s. l., cut-off rigidity for vertical direction 10.8 GV) and by NM of University "Roma Tre" (about sea level, cutoff rigidity 6.7 GV) we determine barometric coefficients both stations for total neutron intensity and for multiplicities m ≥ 1, m ≥ 2, m ≥ 3, m ≥ 4, m ≥ 5, m ≥ 6, m ≥ 7,a nd m ≥ 8, as well as for m=1, m=2, m=3, m=4, m=5, m=6,a nd m=7. We determine also for each hour the effective multiplicity <m> for m ≥ 8 and estimate the barometricc oefficient for <m> for both NM sections. We used hourly data from June 1998 up to April 2001, and we excludedp eriods when above the NM of Emilio Segre' Observatoryw as snow. We compare obtained results with expected according to the theory of meteorological effects for totaln eutron component and for neutron multiplicities.