A review of unusual VLF bursty-patches observed in Northern Finland for Earth, Planets and Space
Abstract Using numerical filtering techniques allowing us to reduce noise from sferics, we are able to clearly study a new type of differently structured very low frequency (VLF) radio waves above f = 4 kHz at the ground station of Kannuslehto in northern Finland (KAN, MLAT = 64.4°N, L = 5.5). These...
Published in: | Earth, Planets and Space |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
SpringerOpen
2021
|
Subjects: | |
Online Access: | https://doi.org/10.1186/s40623-021-01516-y https://doaj.org/article/b74011a8e76a4da68103e28725ecb624 |
id |
ftdoajarticles:oai:doaj.org/article:b74011a8e76a4da68103e28725ecb624 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:b74011a8e76a4da68103e28725ecb624 2023-05-15T17:42:20+02:00 A review of unusual VLF bursty-patches observed in Northern Finland for Earth, Planets and Space Claudia Martinez-Calderon Jyrki K. Manninen Jemina T. Manninen Tauno Turunen 2021-10-01T00:00:00Z https://doi.org/10.1186/s40623-021-01516-y https://doaj.org/article/b74011a8e76a4da68103e28725ecb624 EN eng SpringerOpen https://doi.org/10.1186/s40623-021-01516-y https://doaj.org/toc/1880-5981 doi:10.1186/s40623-021-01516-y 1880-5981 https://doaj.org/article/b74011a8e76a4da68103e28725ecb624 Earth, Planets and Space, Vol 73, Iss 1, Pp 1-14 (2021) VLF waves Magnetospheric waves ELF/VLF VLF bursty-patches Geography. Anthropology. Recreation G Geodesy QB275-343 Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.1186/s40623-021-01516-y 2022-12-31T05:48:05Z Abstract Using numerical filtering techniques allowing us to reduce noise from sferics, we are able to clearly study a new type of differently structured very low frequency (VLF) radio waves above f = 4 kHz at the ground station of Kannuslehto in northern Finland (KAN, MLAT = 64.4°N, L = 5.5). These emissions are intriguing, since they are detected at frequencies above half the electron gyrofrequency in the equatorial plane (f ce) for the L-shell of Kannuslehto (f ce ~ 5–6 kHz). They are commonly observed at Kannuslehto, but have also been infrequently reported at other stations, sometimes under different names. Their possible common origin and manner of propagation is still under investigation. This paper unifies the nomenclature by regrouping all these waves detected at frequencies higher than the local equatorial 0.5 f ce at the L-shell of observation under the name of VLF bursty-patches. While these waves have different spectral features, they appeared mostly composed of hiss bursts with durations of a few seconds to several minutes. They also show periodic features with varying periodicity and shape. They are sometimes characterized by single bursts covering very large frequency ranges of several kHz. We also give a review of the different characteristics of VLF bursty-patches observed at Kannuslehto, which at the moment, is the station with the highest observation rate. We present recent observations between 2019 and 2021. Article in Journal/Newspaper Northern Finland Directory of Open Access Journals: DOAJ Articles Earth, Planets and Space 73 1 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
VLF waves Magnetospheric waves ELF/VLF VLF bursty-patches Geography. Anthropology. Recreation G Geodesy QB275-343 Geology QE1-996.5 |
spellingShingle |
VLF waves Magnetospheric waves ELF/VLF VLF bursty-patches Geography. Anthropology. Recreation G Geodesy QB275-343 Geology QE1-996.5 Claudia Martinez-Calderon Jyrki K. Manninen Jemina T. Manninen Tauno Turunen A review of unusual VLF bursty-patches observed in Northern Finland for Earth, Planets and Space |
topic_facet |
VLF waves Magnetospheric waves ELF/VLF VLF bursty-patches Geography. Anthropology. Recreation G Geodesy QB275-343 Geology QE1-996.5 |
description |
Abstract Using numerical filtering techniques allowing us to reduce noise from sferics, we are able to clearly study a new type of differently structured very low frequency (VLF) radio waves above f = 4 kHz at the ground station of Kannuslehto in northern Finland (KAN, MLAT = 64.4°N, L = 5.5). These emissions are intriguing, since they are detected at frequencies above half the electron gyrofrequency in the equatorial plane (f ce) for the L-shell of Kannuslehto (f ce ~ 5–6 kHz). They are commonly observed at Kannuslehto, but have also been infrequently reported at other stations, sometimes under different names. Their possible common origin and manner of propagation is still under investigation. This paper unifies the nomenclature by regrouping all these waves detected at frequencies higher than the local equatorial 0.5 f ce at the L-shell of observation under the name of VLF bursty-patches. While these waves have different spectral features, they appeared mostly composed of hiss bursts with durations of a few seconds to several minutes. They also show periodic features with varying periodicity and shape. They are sometimes characterized by single bursts covering very large frequency ranges of several kHz. We also give a review of the different characteristics of VLF bursty-patches observed at Kannuslehto, which at the moment, is the station with the highest observation rate. We present recent observations between 2019 and 2021. |
format |
Article in Journal/Newspaper |
author |
Claudia Martinez-Calderon Jyrki K. Manninen Jemina T. Manninen Tauno Turunen |
author_facet |
Claudia Martinez-Calderon Jyrki K. Manninen Jemina T. Manninen Tauno Turunen |
author_sort |
Claudia Martinez-Calderon |
title |
A review of unusual VLF bursty-patches observed in Northern Finland for Earth, Planets and Space |
title_short |
A review of unusual VLF bursty-patches observed in Northern Finland for Earth, Planets and Space |
title_full |
A review of unusual VLF bursty-patches observed in Northern Finland for Earth, Planets and Space |
title_fullStr |
A review of unusual VLF bursty-patches observed in Northern Finland for Earth, Planets and Space |
title_full_unstemmed |
A review of unusual VLF bursty-patches observed in Northern Finland for Earth, Planets and Space |
title_sort |
review of unusual vlf bursty-patches observed in northern finland for earth, planets and space |
publisher |
SpringerOpen |
publishDate |
2021 |
url |
https://doi.org/10.1186/s40623-021-01516-y https://doaj.org/article/b74011a8e76a4da68103e28725ecb624 |
genre |
Northern Finland |
genre_facet |
Northern Finland |
op_source |
Earth, Planets and Space, Vol 73, Iss 1, Pp 1-14 (2021) |
op_relation |
https://doi.org/10.1186/s40623-021-01516-y https://doaj.org/toc/1880-5981 doi:10.1186/s40623-021-01516-y 1880-5981 https://doaj.org/article/b74011a8e76a4da68103e28725ecb624 |
op_doi |
https://doi.org/10.1186/s40623-021-01516-y |
container_title |
Earth, Planets and Space |
container_volume |
73 |
container_issue |
1 |
_version_ |
1766144186008993792 |