Volume 633, January 2020
|Number of page(s)||20|
|Published online||03 January 2020|
Radiation phenomenon for large meteoroids⋆
Retired, Formerly of NASA Ames Research Center, Moffet Field, CA, USA
2 Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea
Accepted: 19 June 2019
Aims. The relationship between the intrinsic properties of a large meteoroid, that is, mass, density, chemical composition, and flight velocity, and its spectrum are identified.
Methods. Assuming thermochemical equilibrium and inviscid flow and using a quasi-one-dimensional approach, the flow-field and radiative transfer problems are solved from the ablating wall of a meteoroid to the observer on the ground.
Results. The study discovers that the precursor region immediately ahead of the shock layer absorbs nitrogen and oxygen lines, and thereby modifies the spectrum received by the ground observer. The study leads to a computer code with which the observed spectra and light-curves for Benesov and Sumava meteoroids are numerically and approximately reproduced with the help of a meteoroid fragmentation theory. Luminous efficiency value is obtained as a byproduct.
Key words: meteorites, meteors, meteoroids / radiation mechanisms: thermal / shock waves
A copy of the code is available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (220.127.116.11) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/633/A25
© ESO 2020
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