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Effective mass function of radio meteoroids as a modulating factor in determining atmospheric scale height

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posted on 2024-05-14, 10:14 authored by Emranul Sarkar, Thomas Ulich, Mark LesterMark Lester

A long-standing problem in meteor science has been the persistent presence of bias in the measured value of atmospheric scale heights obtained from radio meteor echoes. A common practice of fitting a linear function for bias correction follows the assumption that the systematic bias is devoid of seasonal asymmetry. This would be true if the mass and the velocity distribution of meteoroids remain invariant, both spatially and temporally. But so far no such convincing evidence has been published. On the contrary, fundamental arguments suggest that a universal mass function of radio meteoroids is counterintuitive. This parameter cannot remain invariant due to the intrinsic variability in the meteor response function resulting from the Earth’s motion on the plane of ecliptic. In this paper, we show that an inverse relation exists between the width of meteor height distribution, expressed in unit of atmospheric scale height, and the exponent of the mass function. The overall mean of this exponent for the Sodankylä radar is $1.91 \pm 0.02$, modulated by a seasonal variation from the mean of the order of $\sim \pm 0.1$. The stated inverse relation is applied to correct for the effect of mass distribution on the height distribution. Allowing for variable mass correction effectively removes the non-linear bias in the measured scale heights in the meteor ionization region.

History

Author affiliation

College of Science & Engineering/Physics & Astronomy

Version

  • VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Volume

530

Issue

2

Pagination

1921 - 1934

Publisher

Oxford University Press (OUP)

issn

0035-8711

eissn

1365-2966

Copyright date

2024

Available date

2024-05-14

Language

en

Deposited by

Professor Mark Lester

Deposit date

2024-05-10

Data Access Statement

The processed Sodankylä meteor radar data are available at https://www.sgo.fi/pub/MNRAS_ESarkar_2023/data. The raw radar measurement files can be obtained on request from Alexander Kozlovsky (alexander.kozlovsky@oulu.fi). NRLMSISE-00 Atmosphere Model data have been generated from https://ccmc.gsfc.nasa.gov/models/NRLMSIS~00/ and the TIMED/SABER data are available from https://saber.gats-inc.com/.

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