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Processing of VLF Amplitude Measurements: Deduction of a Quiet Time Seasonal Variation

Schneider, Helen und Wendt, Vivien und Banyś (geb. Wenzel), Daniela und Clilverd, Mark und Raita, Tero (2024) Processing of VLF Amplitude Measurements: Deduction of a Quiet Time Seasonal Variation. Radio Science, 59 (2). Wiley. doi: 10.1029/2023RS007834. ISSN 0048-6604.

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Offizielle URL: https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2023RS007834

Kurzfassung

The amplitude of Very Low Frequency (VLF) transmissions propagating from transmitter to receiver between the Earth's surface and the ionospheric D-region is a useful measurement to detect changes in the ionization within the D-region ranging from 60 to 90 km. The VLF signal amplitude is disturbed by geomagnetic, solar, and atmospheric phenomena. To be able to identify perturbations in the VLF signal amplitude, we determine its averaged seasonal variation under quiet solar and geomagnetic conditions. Here it is challenging, that long time series of the VLF signal amplitude show significant jumps and outliers, which are caused artificially by technical adjustments/maintenance work. This paper presents a new approach for processing long VLF data time series over multiple years resulting in level 2 data. The new level 2 data enables the consideration of time series with artificial jumps since the jumps are leveled. Moreover, the outliers are removed by a robust and systematic 2-step outlier filtering. The average seasonal and diurnal variation for different transmitter-receiver combinations can be computed with the new level 2 data by applying a composite analysis. A subsequently applied polynomial fit obtains the quiet time lines for daytime and nighttime, representing the typical seasonal variation under undisturbed conditions of the VLF signal amplitude for each considered link. The developed quiet time lines may serve as a tool to determine perturbations of the VLF signal amplitude with solar and geomagnetic as well as atmospheric origin. Also, they allow comparison of the VLF signal amplitude variation for different transmitter-receiver links.

elib-URL des Eintrags:https://elib.dlr.de/203361/
Dokumentart:Zeitschriftenbeitrag
Titel:Processing of VLF Amplitude Measurements: Deduction of a Quiet Time Seasonal Variation
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Schneider, Helenhelen.schneider (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Wendt, VivienVivien.Wendt (at) dlr.dehttps://orcid.org/0000-0003-1806-4507NICHT SPEZIFIZIERT
Banyś (geb. Wenzel), DanielaDaniela.Banys (at) dlr.dehttps://orcid.org/0000-0001-6623-6612NICHT SPEZIFIZIERT
Clilverd, MarkBritish Antarctic Survey, High Cross, Cambridge, UKNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Raita, TeroUniversity of Oulu, Sodankylä Geophysical ObservatoryNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:10 Februar 2024
Erschienen in:Radio Science
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:59
DOI:10.1029/2023RS007834
Verlag:Wiley
ISSN:0048-6604
Status:veröffentlicht
Stichwörter:- VLF signal processing with robust statistical methods, Median of Absolute Deviations and Pruned Exact Linear Time - Deduction of quiet time amplitude behavior through change point detection and systematic outlier filtering - VLF signal amplitude seasonal variation identified for five different transmitter-receiver paths during undisturbed conditions
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Solar-Terrestrische Kopplungsprozesse
Standort: Neustrelitz
Institute & Einrichtungen:Institut für Solar-Terrestrische Physik > Solar-Terrestrische Kopplungsprozesse
Hinterlegt von: Schneider, Helen
Hinterlegt am:05 Apr 2024 20:55
Letzte Änderung:18 Jun 2024 13:47

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