Physically based alternative to the PE criterion for meteoroids

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http://hdl.handle.net/10138/320662

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Moreno-Ibanez , M , Gritsevich , M , Trigo-Rodriguez , J M & Silber , E A 2020 , ' Physically based alternative to the PE criterion for meteoroids ' , Monthly Notices of the Royal Astronomical Society , vol. 494 , no. 1 , pp. 316-324 . https://doi.org/10.1093/mnras/staa646

Title: Physically based alternative to the PE criterion for meteoroids
Author: Moreno-Ibanez, Manuel; Gritsevich, Maria; Trigo-Rodriguez, Josep M.; Silber, Elizabeth A.
Contributor: University of Helsinki, Department of Physics
Date: 2020-05
Language: eng
Number of pages: 9
Belongs to series: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
URI: http://hdl.handle.net/10138/320662
Abstract: Meteoroids impacting the Earth atmosphere are commonly classified using the PE criterion. This criterion was introduced to support the identification of the fireball type by empirically linking its orbital origin and composition characteristics. Additionally, it is used as an indicator of the meteoroid tensile strength and its ability to penetrate the atmosphere. However, the level of classification accuracy of the PE criterion depends on the ability to constrain the value of the input data, retrieved from the fireball observation, required to derive the PE value. To overcome these uncertainties and achieve a greater classification detail, we propose a new formulation using scaling laws and dimensionless variables that groups all the input variables into two parameters that are directly obtained from the fireball observations. These two parameters, alpha and beta, represent the drag and the mass-loss rates along the luminous part of the trajectory, respectively, and are linked to the shape, strength, ablation efficiency, mineralogical nature of the projectile, and duration of the fireball. Thus, the new formulation relies on a physical basis. This work shows the mathematical equivalence between the PE criterion and the logarithm of 2 alpha beta under the same PE criterion assumptions. We demonstrate that log(2 alpha beta) offers a more general formulation that does not require any preliminary constraint on the meteor flight scenario and discuss the suitability of the new formulation for expanding the classification beyond fully disintegrating fireballs to larger impactors including meteorite-dropping fireballs. The reliability of the new formulation is validated using the Prairie Network meteor observations.
Subject: methods: analytical
methods: data analysis
meteorites, meteors, meteoroids
Earth
planets and satellites: atmospheres
NATURAL COSMIC BODIES
EARTHS ATMOSPHERE
MASS
CONSEQUENCES
COLLISIONS
DRACONIDS
EQUATIONS
NETWORK
HEIGHTS
BOLIDES
115 Astronomy, Space science
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