Verification of the flow regimes based on high fidelity observations of bright meteors
Autor: | Manuel Moreno-Ibáñez, Elizabeth A. Silber, Maria Gritsevich, Josep M. Trigo-Rodríguez |
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Přispěvatelé: | Department of Physics |
Jazyk: | angličtina |
Rok vydání: | 2018 |
Předmět: |
DYNAMICS
Meteor (satellite) Shock wave 010504 meteorology & atmospheric sciences Infrasound FOS: Physical sciences 01 natural sciences Atmosphere symbols.namesake ABUNDANCES 0103 physical sciences ELEMENTS SPECTRA 010303 astronomy & astrophysics 0105 earth and related environmental sciences planets and satellites: atmospheres Physics Earth and Planetary Astrophysics (astro-ph.EP) Meteoroid Reynolds number Astronomy and Astrophysics shock waves Mechanics ATMOSPHERE 115 Astronomy Space science SHOCK-WAVES INFRASOUND meteorites meteors meteoroids Flow (mathematics) Space and Planetary Science DENSITY POROSITIES symbols BODIES Knudsen number Astrophysics::Earth and Planetary Astrophysics Astrophysics - Earth and Planetary Astrophysics |
Zdroj: | Astrophysical Journal |
Popis: | Infrasound monitoring has proved to be effective in detection of the meteor generated shock waves. When combined with optical observations of meteors, this technique is also reliable for detecting centimeter-sized meteoroids that usually ablate at high altitudes, thus offering relevant clues that open the exploration of the meteoroid flight regimes. Since a shock wave is formed as a result of a passage of the meteoroid through the atmosphere, the knowledge of the physical parameters of the surrounding gas around the meteoroid surface can be used to determine the meteor flow regime. This study analyses the flow regimes of a data set of twenty-four centimeter-sized meteoroids for which well constrained infrasound and photometric information is available. This is the first time that the flow regimes for meteoroids in this size range are validated from observations. From our approach, the Knudsen and Reynolds numbers are calculated, and two different flow regime evaluation approaches are compared in order to validate the theoretical formulation. The results demonstrate that a combination of fluid dynamic dimensionless parameters is needed to allow a better inclusion of the local physical processes of the phenomena. 41 pages, 3 Figures and 3 Tables (in press in ApJ) |
Databáze: | OpenAIRE |
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