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Kozlovsky, A., Shalimov, S., Kero, J., Raita, T., & Lester, M. (2018). Multi‐instrumental observations of nonunderdense meteor trails. Journal of Geophysical Research: Space Physics, 123, 5974– 5989.

Multi‐instrumental observations of nonunderdense meteor trails

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Author: Kozlovsky, A.1; Shalimov, S.2,3,4; Kero, J.5;
Organizations: 1Sodankylä Geophysical Observatory, Sodankylä, Finland
2Institute of Physics of the Earth RAS, Moscow, Russia
3Space Research Institute, Moscow, Russia
4National Research Center “Kurchatov Institute”, Moscow, Russia
5Swedish Institute of Space Physics, Kiruna, Sweden
6Department of Physics and Astronomy, University of Leicester, Leicester, UK
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 6.3 MB)
Persistent link:
Language: English
Published: American Geophysical Union, 2018
Publish Date: 2019-09-24


Using data from the Sodankylä Geophysical Observatory (67°22′N, 26°38′E, Finland) meteor camera from the whole year 2015, we identified and investigated 28 optical meteors with accompanying ionization trails unambiguously detected by the Sodankylä Geophysical Observatory ionosonde, which sounded the ionosphere once per minute with frequency rising from 0.5 to 16 MHz. These ionosonde reflections were obtained from heights around 90 km. The electron line densities of the trails were found to be between 10¹⁴ and 10¹⁶ m⁻¹, which characterize the trails as nonunderdense (i.e., transitional and overdense). The ionosonde reflections were observed for a few minutes, with decreasing maximal frequency of the return. During the first 250 s, for the trails with initial line density about (2–3) · 10¹⁵ m⁻¹ the return frequency decreased with time corresponding to the diffusional expansion of cylindrical meteor trails, that is, \(f ∝ t^{−γ}\), where the exponent \(γ = 0.5\), whereas less dense trails decayed slower (\(γ ≈ 0.2)\) and more dense trails decayed faster (\(γ ≈ 1\)). In many cases the meteor events were accompanied by nonspecular long‐lived detections using a colocated all‐sky interferometric meteor radar with operating frequency 36.9 MHz. As a rule the meteor radar echo durations were longer than expected from diffusional expansion of cylindrical meteor trails and their amplitudes were highly variable. We suggest that the slower frequency decrease of the ionosonde echoes and the nonspecular long‐lived meteor radar echoes might be associated with the presence of meteoric dust.

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Series: Journal of geophysical research. Space physics
ISSN: 2169-9380
ISSN-E: 2169-9402
ISSN-L: 2169-9380
Volume: 123
Issue: 7
Pages: 5974 - 5989
DOI: 10.1029/2018JA025405
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
114 Physical sciences
1171 Geosciences
Funding: S. S. acknowledges support from the Academy of Finland via grant 310348. J. K. acknowledges support from the Swedish Research Council via project grant 2012‐4074.
Academy of Finland Grant Number: 310348
Detailed Information: 310348 (Academy of Finland Funding decision)
Copyright information: © 2018. American Geophysical Union. All Rights Reserved.