DOI: 10.1029/2018JA025405
Scopus记录号: 2-s2.0-85051087546
论文题名: Multi-Instrumental Observations of Nonunderdense Meteor Trails
作者: Kozlovsky A. ; Shalimov S. ; Kero J. ; Raita T. ; Lester M.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 7 起始页码: 5974
结束页码: 5989
语种: 英语
英文关键词: ionosonde
; meteor radar
; meteoric dust
; meteors
; trails of meteors
英文摘要: 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. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113604
Appears in Collections: 气候减缓与适应
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作者单位: Sodankylä Geophysical Observatory, Sodankylä, Finland; Institute of Physics of the Earth RAS, Moscow, Russian Federation; Space Research Institute, Moscow, Russian Federation; National Research Center “Kurchatov Institute”, Moscow, Russian Federation; Swedish Institute of Space Physics, Kiruna, Sweden; Department of Physics and Astronomy, University of Leicester, Leicester, United Kingdom
Recommended Citation:
Kozlovsky A.,Shalimov S.,Kero J.,et al. Multi-Instrumental Observations of Nonunderdense Meteor Trails[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(7)