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...
Main Authors: | , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Hoboken, NJ : Wiley
2021
|
Subjects: | |
Online Access: | https://oa.tib.eu/renate/handle/123456789/8054 https://doi.org/10.34657/7095 |
id |
fttibhannoverren:oai:oa.tib.eu:123456789/8054 |
---|---|
record_format |
openpolar |
spelling |
fttibhannoverren:oai:oa.tib.eu:123456789/8054 2024-09-15T18:21:53+00:00 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 application/pdf https://oa.tib.eu/renate/handle/123456789/8054 https://doi.org/10.34657/7095 eng eng Hoboken, NJ : Wiley ESSN:1944-8007 DOI:https://doi.org/10.1029/2021GL094581 https://oa.tib.eu/renate/handle/123456789/8054 https://doi.org/10.34657/7095 CC BY-NC-ND 4.0 Unported https://creativecommons.org/licenses/by-nc-nd/4.0/ frei zugänglich ddc:550 D-region mesospheric temperature semidiurnal solar tide VLF propagation VLF signal absorption status-type:publishedVersion doc-type:Article doc-type:Text 2021 fttibhannoverren https://doi.org/10.34657/709510.1029/2021GL094581 2024-07-03T23:33:52Z 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 Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover) |
institution |
Open Polar |
collection |
Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover) |
op_collection_id |
fttibhannoverren |
language |
English |
topic |
ddc:550 D-region mesospheric temperature semidiurnal solar tide VLF propagation VLF signal absorption |
spellingShingle |
ddc:550 D-region mesospheric temperature semidiurnal solar tide VLF propagation VLF signal absorption 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 |
ddc:550 D-region mesospheric temperature semidiurnal solar tide VLF propagation VLF signal absorption |
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://oa.tib.eu/renate/handle/123456789/8054 https://doi.org/10.34657/7095 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
ESSN:1944-8007 DOI:https://doi.org/10.1029/2021GL094581 https://oa.tib.eu/renate/handle/123456789/8054 https://doi.org/10.34657/7095 |
op_rights |
CC BY-NC-ND 4.0 Unported https://creativecommons.org/licenses/by-nc-nd/4.0/ frei zugänglich |
op_doi |
https://doi.org/10.34657/709510.1029/2021GL094581 |
_version_ |
1810460916159873024 |