Multi-Instrumental Observations of Nonunderdense Meteor Trails
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...
Main Authors: | , , , , |
---|---|
Format: | Other Non-Article Part of Journal/Newspaper |
Language: | unknown |
Published: |
2018
|
Subjects: | |
Online Access: | https://figshare.com/articles/journal_contribution/Multi-Instrumental_Observations_of_Nonunderdense_Meteor_Trails/10223744 |
id |
ftleicesterunfig:oai:figshare.com:article/10223744 |
---|---|
record_format |
openpolar |
spelling |
ftleicesterunfig:oai:figshare.com:article/10223744 2023-05-15T18:20:15+02:00 Multi-Instrumental Observations of Nonunderdense Meteor Trails A Kozlovsky S Shalimov J Kero T Raita M Lester 2018-07-06T00:00:00Z https://figshare.com/articles/journal_contribution/Multi-Instrumental_Observations_of_Nonunderdense_Meteor_Trails/10223744 unknown 2381/45268 https://figshare.com/articles/journal_contribution/Multi-Instrumental_Observations_of_Nonunderdense_Meteor_Trails/10223744 All Rights Reserved Uncategorized Science & Technology Physical Sciences Astronomy & Astrophysics MESOSPHERIC TEMPERATURE ESTIMATION DECAY TIMES PLASMA TURBULENCE SHOWER Text Journal contribution 2018 ftleicesterunfig 2021-11-11T19:22:29Z 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 10^14 and 10^16 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) · 10^15 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. Other Non-Article Part of Journal/Newspaper Sodankylä University of Leicester: Figshare Sodankylä ENVELOPE(26.600,26.600,67.417,67.417) |
institution |
Open Polar |
collection |
University of Leicester: Figshare |
op_collection_id |
ftleicesterunfig |
language |
unknown |
topic |
Uncategorized Science & Technology Physical Sciences Astronomy & Astrophysics MESOSPHERIC TEMPERATURE ESTIMATION DECAY TIMES PLASMA TURBULENCE SHOWER |
spellingShingle |
Uncategorized Science & Technology Physical Sciences Astronomy & Astrophysics MESOSPHERIC TEMPERATURE ESTIMATION DECAY TIMES PLASMA TURBULENCE SHOWER A Kozlovsky S Shalimov J Kero T Raita M Lester Multi-Instrumental Observations of Nonunderdense Meteor Trails |
topic_facet |
Uncategorized Science & Technology Physical Sciences Astronomy & Astrophysics MESOSPHERIC TEMPERATURE ESTIMATION DECAY TIMES PLASMA TURBULENCE SHOWER |
description |
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 10^14 and 10^16 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) · 10^15 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 |
Other Non-Article Part of Journal/Newspaper |
author |
A Kozlovsky S Shalimov J Kero T Raita M Lester |
author_facet |
A Kozlovsky S Shalimov J Kero T Raita M Lester |
author_sort |
A Kozlovsky |
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 |
publishDate |
2018 |
url |
https://figshare.com/articles/journal_contribution/Multi-Instrumental_Observations_of_Nonunderdense_Meteor_Trails/10223744 |
long_lat |
ENVELOPE(26.600,26.600,67.417,67.417) |
geographic |
Sodankylä |
geographic_facet |
Sodankylä |
genre |
Sodankylä |
genre_facet |
Sodankylä |
op_relation |
2381/45268 https://figshare.com/articles/journal_contribution/Multi-Instrumental_Observations_of_Nonunderdense_Meteor_Trails/10223744 |
op_rights |
All Rights Reserved |
_version_ |
1766197764157341696 |