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Ablation and chemical alteration of cosmic dust particles during entry into the earth`s atmosphere

DRS at CSIR-National Institute of Oceanography

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Title Ablation and chemical alteration of cosmic dust particles during entry into the earth`s atmosphere
 
Creator Rudraswami, N.G.
ShyamPrasad, M.
Dey, S.
Plane, J.M.C.
Feng, W.
Carrillo-Sanchez, J.D.
Fernandes, D.
 
Subject Geology and geophysics
Chemistry and biogeochemistry
Chemistry and biogeochemistry
Geology and geophysics
 
Description Most dust-sized cosmic particles undergo ablation and chemical alteration during atmospheric entry, which alters their original properties. A comprehensive understanding of this process is essential in order to decipher their pre-entry characteristics. The purpose of the study is to illustrate the process of vaporization of different elements for various entry parameters. The numerical results for particles of various sizes and various zenith angles are treated in order to understand the changes in chemical composition that the particles undergo as they enter the atmosphere. Particles with large sizes (> few hundred Mu m) and high entry velocities (>16 km s-1) experience less time at peak temperatures compared to those that have lower velocities. Model calculations suggest that particles can survive with an entry velocity of 11 km s-1 and zenith angles (ZA) of 30°-90°, which accounts for ~66% of the region where particles retain their identities. Our results suggest that the changes in chemical composition of MgO, SiO2, and FeO are not significant for an entry velocity of 11 km s-1 and sizes
 
Date 2017-02-14T11:47:31Z
2017-02-14T11:47:31Z
2016
 
Type Journal Article
 
Identifier Astrophysical Journal Supplement Series, vol.227(2); 2016; no.15 doi.: 10.3847/0067-0049/227/2/15
http://drs.nio.org/drs/handle/2264/5063
 
Language en
 
Rights An edited version of this paper was published by American Astronomical Society. Copyright [2016] American Astronomical Society
 
Publisher American Astronomical Society