Physics of meteor generated shock waves in the Earth’s atmosphere : A review

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Silber , E A , Boslough , M , Hocking , W K , Gritsevich , M & Whitaker , R W 2018 , ' Physics of meteor generated shock waves in the Earth’s atmosphere : A review ' , Advances in Space Research , vol. 62 , no. 3 , pp. 489-532 . https://doi.org/10.1016/j.asr.2018.05.010

Title: Physics of meteor generated shock waves in the Earth’s atmosphere : A review
Author: Silber, Elizabeth A.; Boslough, Mark; Hocking, Wayne K.; Gritsevich, Maria; Whitaker, Rodney W.
Contributor: University of Helsinki, Department of Physics
Date: 2018-08-01
Language: eng
Number of pages: 44
Belongs to series: Advances in Space Research
ISSN: 0273-1177
URI: http://hdl.handle.net/10138/316301
Abstract: Shock waves and the associated phenomena generated by strongly ablating meteoroids with sizes greater than a few millimeters in the lower transitional flow regime of the Earth's atmosphere are the least explored aspect of meteor science. In this paper, we present a comprehensive review of literature covering meteor generated shock wave phenomena, from the aspect of both meteor science and hypersonic gas dynamics. The primary emphasis of this review is placed on the mechanisms and dynamics of the meteor shock waves. We discuss key aspects of both shock generation and propagation, including the great importance of the hydrodynamic shielding that develops around the meteoroid. In addition to this in-depth review, the discussion is extended to an overview of meteoroid fragmentation, followed by airburst type events associated with large, deep penetrating meteoroids. This class of objects has a significant potential to cause extensive material damage and even human casualties on the ground, and as such is of great interest to the planetary defense community. To date, no comprehensive model exists that accurately describes the flow field and shock wave formation of a strongly ablating meteoroid in the non-continuum flow regime. Thus, we briefly present the current state of numerical models that describe the comparatively slower flow of air over non-ablating bodies in the rarefied regime. In respect to the elusive nature of meteor generated shock wave detection, we also discuss relevant aspects and applications of meteor radar and infrasound studies as tools that can be utilized to study meteor shock waves and related phenomena. In particular, infrasound data can provide energy release estimates of meteoroids entering the Earth's atmosphere. We conclude with a summary of unresolved questions in the domain of meteor generated shock waves; topics which should be a focus of future investigations in the field. (C) 2018 COSPAR. Published by Elsevier Ltd. All rights reserved.
Subject: Meteor
Shock wave
Meteoroid
Cylindrical shock wave
Shock physics
Meteor radar
ACOUSTIC-GRAVITY WAVES
HIGH-ALTITUDE METEORS
ENERGY DEPOSITION
AMBIPOLAR DIFFUSION
HYPERSONIC FLOWS
1908 TUNGUSKA EXPLOSION
SIMULATION MONTE-CARLO
RADIOWAVE SCATTERING
NUMERICAL-SIMULATION
SHOEMAKER-LEVY 9
115 Astronomy, Space science
114 Physical sciences
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