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The connection between the October effect in VLF observations and neutral atmosphere dynamics

Wendt, Vivien and Schneider, Helen and Banyś (geb. Wenzel), Daniela and Hansen, Marc (2022) The connection between the October effect in VLF observations and neutral atmosphere dynamics. VERSIM 2022, 07.-11. Nov. 2022, Sodankylä (hybrid).

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Abstract

The October effect is long known as a strong decrease in VLF amplitudes occurring every October. However, neither it’s formation mechanism nor the characteristic of the October effect are known. Simultaneously with the October effect we observe a regional temperature increase between 55 and 75 km, i.e. in the region where VLF radio waves are reflected. In theory an increase in temperature can lead to an increased collision frequency and thus an increased VLF signal absorption resulting in a decreased VLF amplitude. Thus, there seems to be a connection between the October effect and the neutral atmosphere dynamics. Here we want to investigate the characteristics of the October effect in VLF signals in connection to neutral atmosphere temperature using different transmitter and receiver combiations as well as MLS satellite observations. We found that the October effect is strongest in polar latitudes and vanishes in low latitudes for temperature and VLF observations. Finally a possible formation mechanism for the October effect will be discussed.

Item URL in elib:https://elib.dlr.de/189764/
Document Type:Conference or Workshop Item (Speech)
Title:The connection between the October effect in VLF observations and neutral atmosphere dynamics
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Wendt, VivienUNSPECIFIEDhttps://orcid.org/0000-0003-1806-4507UNSPECIFIED
Schneider, HelenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Banyś (geb. Wenzel), DanielaUNSPECIFIEDhttps://orcid.org/0000-0001-6623-6612UNSPECIFIED
Hansen, MarcUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:9 November 2022
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:October effect, VLF, Mesosphere, Dynamics
Event Title:VERSIM 2022
Event Location:Sodankylä (hybrid)
Event Type:international Conference
Event Dates:07.-11. Nov. 2022
Organizer:Sodankylä Geophysical Observatory
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication, Navigation, Quantum Technology
DLR - Research area:Raumfahrt
DLR - Program:R KNQ - Communication, Navigation, Quantum Technology
DLR - Research theme (Project):R - Ionosphere
Location: Neustrelitz
Institutes and Institutions:Institute for Solar-Terrestrial Physics > Solar-Terrestrial Coupling Processes
Deposited By: Wendt, Dr. Vivien
Deposited On:05 Dec 2022 11:36
Last Modified:29 Mar 2023 00:52

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