Multi‐instrumental observations of nonunderdense meteor trails
Abstract 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 so...
Main Authors: | , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union
2018
|
Subjects: | |
Online Access: | http://urn.fi/urn:nbn:fi-fe2019092429535 |
id |
ftunivoulu:oai:oulu.fi:nbnfi-fe2019092429535 |
---|---|
record_format |
openpolar |
spelling |
ftunivoulu:oai:oulu.fi:nbnfi-fe2019092429535 2023-07-30T04:06:49+02:00 Multi‐instrumental observations of nonunderdense meteor trails Kozlovsky, A. (A.) Shalimov, S. (S.) Kero, J. (J.) Raita, T. (T.) Lester, M. (M.) 2018 application/pdf http://urn.fi/urn:nbn:fi-fe2019092429535 eng eng American Geophysical Union info:eu-repo/semantics/openAccess © 2018. American Geophysical Union. All Rights Reserved. ionosonde meteor radar meteoric dust meteors trails of meteors info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2018 ftunivoulu 2023-07-08T19:55:57Z Abstract 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. Article in Journal/Newspaper Sodankylä Jultika - University of Oulu repository Sodankylä ENVELOPE(26.600,26.600,67.417,67.417) |
institution |
Open Polar |
collection |
Jultika - University of Oulu repository |
op_collection_id |
ftunivoulu |
language |
English |
topic |
ionosonde meteor radar meteoric dust meteors trails of meteors |
spellingShingle |
ionosonde meteor radar meteoric dust meteors trails of meteors Kozlovsky, A. (A.) Shalimov, S. (S.) Kero, J. (J.) Raita, T. (T.) Lester, M. (M.) Multi‐instrumental observations of nonunderdense meteor trails |
topic_facet |
ionosonde meteor radar meteoric dust meteors trails of meteors |
description |
Abstract 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. |
format |
Article in Journal/Newspaper |
author |
Kozlovsky, A. (A.) Shalimov, S. (S.) Kero, J. (J.) Raita, T. (T.) Lester, M. (M.) |
author_facet |
Kozlovsky, A. (A.) Shalimov, S. (S.) Kero, J. (J.) Raita, T. (T.) Lester, M. (M.) |
author_sort |
Kozlovsky, A. (A.) |
title |
Multi‐instrumental observations of nonunderdense meteor trails |
title_short |
Multi‐instrumental observations of nonunderdense meteor trails |
title_full |
Multi‐instrumental observations of nonunderdense meteor trails |
title_fullStr |
Multi‐instrumental observations of nonunderdense meteor trails |
title_full_unstemmed |
Multi‐instrumental observations of nonunderdense meteor trails |
title_sort |
multi‐instrumental observations of nonunderdense meteor trails |
publisher |
American Geophysical Union |
publishDate |
2018 |
url |
http://urn.fi/urn:nbn:fi-fe2019092429535 |
long_lat |
ENVELOPE(26.600,26.600,67.417,67.417) |
geographic |
Sodankylä |
geographic_facet |
Sodankylä |
genre |
Sodankylä |
genre_facet |
Sodankylä |
op_rights |
info:eu-repo/semantics/openAccess © 2018. American Geophysical Union. All Rights Reserved. |
_version_ |
1772819742696931328 |