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Infrasound monitoring has proved to be effective in detection of the meteorgenerated shock waves. When combined with optical observations of meteors, thistechnique is also reliable for detecting centimeter-sized meteoroids thatusually ablate at high altitudes, thus offering relevant clues that open theexploration of the meteoroid flight regimes. Since a shock wave is formed as aresult of a passage of the meteoroid through the atmosphere, the knowledge ofthe physical parameters of the surrounding gas around the meteoroid surface canbe used to determine the meteor flow regime. This study analyses the flowregimes of a data set of twenty-four centimeter-sized meteoroids for which wellconstrained infrasound and photometric information is available. This is thefirst time that the flow regimes for meteoroids in this size range arevalidated from observations. From our approach, the Knudsen and Reynoldsnumbers are calculated, and two different flow regime evaluation approaches arecompared in order to validate the theoretical formulation. The resultsdemonstrate that a combination of fluid dynamic dimensionless parameters isneeded to allow a better inclusion of the local physical processes of thephenomena.

Verification of the flow regimes based on high fidelity observations of bright meteors