University of Oulu

Kozlovsky, A., Lukianova, R., & Lester, M. (2020). Occurrence and altitude of the long‐lived nonspecular meteor trails during meteor showers at high latitudes. Journal of Geophysical Research: Space Physics, 125, e2019JA027746. https://doi.org/10.1029/2019JA027746

Occurrence and altitude of the long‐lived nonspecular meteor trails during meteor showers at high latitudes

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Author: Kozlovsky, A.1; Lukianova, R.2,3; Lester, M.4
Organizations: 1Sodankylä Geophysical Observatory, Sodankylä, Finland
2Space Research Institute, Moscow, Russia
3Institute of Earth's Science, Saint Petersburg State University, Saint Petersburg, Russia
4Department of Physics and Astronomy, University of Leicester, Leicester, UK
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 10.5 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe202102175168
Language: English
Published: American Geophysical Union, 2020
Publish Date: 2021-02-17
Description:

Abstract

Meteoroids entering the Earth’s atmosphere produce ionized trails, which are detectable by radio sounding. Cylindrical underdense (and partly overdense) trails form a great majority of meteor echoes received by meteor radars (MRs). Additionally, the long‐lived nonspecular (LLNS) meteor echoes are received from irregularities of ionization generated along tracks of relatively large meteoroids. At high latitudes where the magnetic field is nearly perpendicular to the Earth’s surface the LLNS echoes are possible only from non‐field‐aligned irregularities. The occurrence and height distributions of LLNS echoes are studied using MR observations at the high‐latitude Sodankylä Geophysical Observatory (SGO, 67°22’N, 26°38’E, Finland) during 2008–2019. Two parameters are analyzed: the percentage and height distribution of LLNS echoes. These LLNS echoes constitute about 3% of all MR detections. However, during certain meteor showers (i.e., the Geminids, Perseids, Quadrantids, Arietids or/and Daytime ζ‐Perseids, and Lyrids) the percentage of LLNS echoes is noticeably higher (about 10%, 8%, 7%, 7%, and 4%, respectively). Typically, the LLNSs occur ∼1–2 km higher than other echoes (in June–July the height difference is reduced to ∼0.5–1 km). Moreover, during the Lyrids, η‐Aquariids, Perseids, Orionids, and Leonids the LLNS echoes occur noticeably, up to 3–5 km, higher than the echoes from other types of trails.

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Series: Journal of geophysical research. Space physics
ISSN: 2169-9380
ISSN-E: 2169-9402
ISSN-L: 2169-9380
Volume: 125
Issue: 8
Article number: e2019JA027746
DOI: 10.1029/2019JA027746
OADOI: https://oadoi.org/10.1029/2019JA027746
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Subjects:
Funding: R. L. acknowledges support from the Academy of Finland via Grant 322360. M. L. acknowledges support from Science and Technology Facilities Council (STFC) via Grant ST/S000429/1.
Academy of Finland Grant Number: 322360
Detailed Information: 322360 (Academy of Finland Funding decision)
Copyright information: © 2020. American Geophysical Union.