elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

VLF measurements and their use for investigating the ionospheric D-layer with the example of the October effect

Hansen, Marc and Banyś (geb. Wenzel), Daniela and Wenzel, David and Lutz, Heinrich and Hoque, Mohammed Mainul (2022) VLF measurements and their use for investigating the ionospheric D-layer with the example of the October effect. The International Workshop on GNSS Ionosphere (IWGI2022), 26.-28. Sep 2022, Neustrelitz, Germany. (Unpublished)

[img] PDF - Only accessible within DLR
1MB

Abstract

Very Low Frequencies (VLF) radio signals are constantly used for communication by navies because they can be received over very long distances. This is due to their reflections between the surface of the earth and the ionospheric D-layer, which acts as a waveguide. As their propagation is determined by the state of the D-layer, they are particular useful for the investigation of the D-layer itself. The 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 ionospheric D-layer. On the contrary, various amplitude measurements show an asymmetry around fall by deviating from the expected variation defined by the solar zenith angle. Furthermore, the VLF signal amplitude shows a persistent sharp decrease during October at mid and high latitudes. This drastic change in the amplitude level is the so-called “October effect”. As the VLF signal amplitude follows the state of the D-layer, the D-layer in mid and high latitudes must undergo a seasonal variation. The influence of these seasonal ionospheric variations on the VLF signal propagation is investigated by the joint project “Analysis of the MEsosphere and Lower Ionosphere fall Effect” (AMELIE) between the Leibniz-Institute of Atmospheric Physics (IAP) and DLR.

Item URL in elib:https://elib.dlr.de/188765/
Document Type:Conference or Workshop Item (Speech)
Title:VLF measurements and their use for investigating the ionospheric D-layer with the example of the October effect
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Hansen, MarcMarc.Hansen (at) dlr.deUNSPECIFIED
Banyś (geb. Wenzel), DanielaDaniela.Banys (at) dlr.deUNSPECIFIED
Wenzel, DavidDavid.Wenzel (at) dlr.deUNSPECIFIED
Lutz, HeinrichLutz.Heinrich (at) dlr.deUNSPECIFIED
Hoque, Mohammed MainulMainul.Hoque (at) dlr.deUNSPECIFIED
Date:27 September 2022
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Unpublished
Keywords:VLF, Ionosphere, D-layer, VLF, October effect
Event Title:The International Workshop on GNSS Ionosphere (IWGI2022)
Event Location:Neustrelitz, Germany
Event Type:international Conference
Event Dates:26.-28. Sep 2022
Organizer:Deutsches Zentrum für Luft und Raumfahrt e.V. (DLR)
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 > Space Weather Observation
Deposited By: Hansen, Marc
Deposited On:14 Oct 2022 12:13
Last Modified:14 Oct 2022 12:13

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.