Spring‐Fall Asymmetry in VLF Amplitudes Recorded in the North Atlantic Region: The Fall‐Effect

A spring-fall asymmetry is observed in daytime amplitude values of very low frequency (VLF) radio wave signals propagating over the North Atlantic during 2011–2019. We explore the processes behind this asymmetry by comparing against mesospheric mean temperatures and the semidiurnal solar tide (S2) i...

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Main Authors: Macotela, E.L., Clilverd, M., Renkwitz, T., Chau, J., Manninen, J., Banyś, D.
Format: Article in Journal/Newspaper
Language:unknown
Published: Hoboken, NJ : Wiley 2021
Subjects:
D-region
mesospheric temperature
semidiurnal solar tide
VLF propagation
VLF signal absorption
550
North Atlantic
Online Access:https://dx.doi.org/10.34657/7095
https://oa.tib.eu/renate/handle/123456789/8054
id ftdatacite:10.34657/7095
record_format openpolar
spelling ftdatacite:10.34657/7095 2023-05-15T17:29:28+02:00 Spring‐Fall Asymmetry in VLF Amplitudes Recorded in the North Atlantic Region: The Fall‐Effect Macotela, E.L. Clilverd, M. Renkwitz, T. Chau, J. Manninen, J. Banyś, D. 2021 https://dx.doi.org/10.34657/7095 https://oa.tib.eu/renate/handle/123456789/8054 unknown Hoboken, NJ : Wiley Creative Commons Attribution Non Commercial No Derivatives 4.0 International CC BY-NC-ND 4.0 Unported https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode cc-by-nc-nd-4.0 CC-BY-NC-ND D-region mesospheric temperature semidiurnal solar tide VLF propagation VLF signal absorption 550 article CreativeWork 2021 ftdatacite https://doi.org/10.34657/7095 2022-04-01T09:37:59Z A spring-fall asymmetry is observed in daytime amplitude values of very low frequency (VLF) radio wave signals propagating over the North Atlantic during 2011–2019. We explore the processes behind this asymmetry by comparing against mesospheric mean temperatures and the semidiurnal solar tide (S2) in mesospheric winds. The solar radiation influence on VLF subionospheric propagation was removed from the daytime VLF amplitude values, isolating the fall-effect. Similarly, the symmetric background level was removed from mesospheric mean temperatures undertaking comparable analysis. During fall, all three analyzed parameters experience significant deviation from their background levels. The VLF amplitude variation during spring is explained by the seasonal variation in solar illumination conditions, while the fall-effect can be interpreted as a mean zonal wind reversal associated with both a S2 enhancement, and temperature reductions. Decreases in temperature can produce decreases in collision frequency, reducing VLF signal absorption, driving the observed VLF asymmetry. Article in Journal/Newspaper North Atlantic DataCite Metadata Store (German National Library of Science and Technology)
institution Open Polar
collection DataCite Metadata Store (German National Library of Science and Technology)
op_collection_id ftdatacite
language unknown
topic D-region
mesospheric temperature
semidiurnal solar tide
VLF propagation
VLF signal absorption
550
spellingShingle D-region
mesospheric temperature
semidiurnal solar tide
VLF propagation
VLF signal absorption
550
Macotela, E.L.
Clilverd, M.
Renkwitz, T.
Chau, J.
Manninen, J.
Banyś, D.
Spring‐Fall Asymmetry in VLF Amplitudes Recorded in the North Atlantic Region: The Fall‐Effect
topic_facet D-region
mesospheric temperature
semidiurnal solar tide
VLF propagation
VLF signal absorption
550
description A spring-fall asymmetry is observed in daytime amplitude values of very low frequency (VLF) radio wave signals propagating over the North Atlantic during 2011–2019. We explore the processes behind this asymmetry by comparing against mesospheric mean temperatures and the semidiurnal solar tide (S2) in mesospheric winds. The solar radiation influence on VLF subionospheric propagation was removed from the daytime VLF amplitude values, isolating the fall-effect. Similarly, the symmetric background level was removed from mesospheric mean temperatures undertaking comparable analysis. During fall, all three analyzed parameters experience significant deviation from their background levels. The VLF amplitude variation during spring is explained by the seasonal variation in solar illumination conditions, while the fall-effect can be interpreted as a mean zonal wind reversal associated with both a S2 enhancement, and temperature reductions. Decreases in temperature can produce decreases in collision frequency, reducing VLF signal absorption, driving the observed VLF asymmetry.
format Article in Journal/Newspaper
author Macotela, E.L.
Clilverd, M.
Renkwitz, T.
Chau, J.
Manninen, J.
Banyś, D.
author_facet Macotela, E.L.
Clilverd, M.
Renkwitz, T.
Chau, J.
Manninen, J.
Banyś, D.
author_sort Macotela, E.L.
title Spring‐Fall Asymmetry in VLF Amplitudes Recorded in the North Atlantic Region: The Fall‐Effect
title_short Spring‐Fall Asymmetry in VLF Amplitudes Recorded in the North Atlantic Region: The Fall‐Effect
title_full Spring‐Fall Asymmetry in VLF Amplitudes Recorded in the North Atlantic Region: The Fall‐Effect
title_fullStr Spring‐Fall Asymmetry in VLF Amplitudes Recorded in the North Atlantic Region: The Fall‐Effect
title_full_unstemmed Spring‐Fall Asymmetry in VLF Amplitudes Recorded in the North Atlantic Region: The Fall‐Effect
title_sort spring‐fall asymmetry in vlf amplitudes recorded in the north atlantic region: the fall‐effect
publisher Hoboken, NJ : Wiley
publishDate 2021
url https://dx.doi.org/10.34657/7095
https://oa.tib.eu/renate/handle/123456789/8054
genre North Atlantic
genre_facet North Atlantic
op_rights Creative Commons Attribution Non Commercial No Derivatives 4.0 International
CC BY-NC-ND 4.0 Unported
https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
cc-by-nc-nd-4.0
op_rightsnorm CC-BY-NC-ND
op_doi https://doi.org/10.34657/7095
_version_ 1766123595679924224

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