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Developing an analytical model for VLF signal amplitudes with consideration of the fall effect

Hansen, Marc and Wenzel, David and Banyś (geb. Wenzel), Daniela and Hoque, Mohammed Mainul and Macotela, E.L. and Chau, J. and Clilverd, M. (2021) Developing an analytical model for VLF signal amplitudes with consideration of the fall effect. 17th European Space Weather Week (ESWW2021/ESWW17), Glasgow, Scotland.

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Daytime VLF radio signals observed over a year would be expected to follow the yearly variation of the solar zenith angle, as the solar radiation is driving the ionization in the D-layer of the ionosphere. On the contrary, various amplitude measurements show an asymmetry around fall by deviating from the expected variation defined by the solar zenith angle. This asymmetry is referred to as the fall effect. As this investigation is an ongoing effort, based on the DLR project "Analysis of the MEsosphere and Lower Ionosphere fall Effect (AMELIE)" joined together with the IAP, the current status of the investigation of the fall effect will be presented. Finding a suitable description of the size of the asymmetric behavior will help in further research on the main factors that affect the ionosphere. For understanding these seasonal influences, short-term disturbances must be eliminated, so we developed an analytical model, confined to exemplary links in the northern hemisphere, which gives an expected, quite-day value for a given day and signal path. Perturbations are caused by, e.g., solar flares. Comparing the derived unperturbed value of the model with the measurements will additionally allow to detect such impacts.

Item URL in elib:https://elib.dlr.de/145906/
Document Type:Conference or Workshop Item (Poster)
Title:Developing an analytical model for VLF signal amplitudes with consideration of the fall effect
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Hansen, MarcMarc.Hansen (at) dlr.deUNSPECIFIED
Wenzel, DavidDavid.Wenzel (at) dlr.deUNSPECIFIED
Banyś (geb. Wenzel), DanielaDaniela.Banys (at) dlr.deUNSPECIFIED
Hoque, Mohammed MainulMainul.Hoque (at) dlr.deUNSPECIFIED
Date:October 2021
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:VLF, ionosphere, fall effect, AMELIE
Event Title:17th European Space Weather Week (ESWW2021/ESWW17)
Event Location:Glasgow, Scotland
Event Type:international Conference
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Solar-Terrestrial Physics SO, R - Ionosphere
Location: Neustrelitz
Institutes and Institutions:Institute for Solar-Terrestrial Physics > Space Weather Observation
Deposited By: Hansen, Marc
Deposited On:02 Dec 2021 07:15
Last Modified:02 Dec 2021 07:15

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