University of Oulu

Macotela, E. L., Němec, F., Manninen, J., Santolík, O., Kolmašová, I., & Turunen, T. ( 2019). VLF emissions with banded structure in the 16‐ to 39‐kHz frequency range measured by a high‐latitude ground‐based receiver. Geophysical Research Letters, 46, 14214– 14222.

VLF emissions with banded structure in the 16‐ to 39‐kHz frequency range measured by a high‐latitude ground‐based receiver

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Author: Macotela, Edith L.1; Němec, František2; Manninen, Jyrki1;
Organizations: 1Sodankylä Geophysical Observatory, University of Oulu, Sodankylä, Finland
2Faculty of Mathematics and Physics, Charles University, Prague, Czechia
3Department of Space Physics, Institute of Atmospheric Physics, The Czech Academy of Sciences, Prague, Czechia
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 7.7 MB)
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Language: English
Published: American Geophysical Union, 2019
Publish Date: 2020-06-10


Very low frequency (VLF) emissions of natural origin were identified for the first time by analyzing 1‐hr ground‐based magnetic field spectrograms in the 0.2‐ to 39‐kHz frequency range. Data were used from the Kannuslehto radio receiver (L‐shell ~5.5), recorded during different campaigns between 2006 and 2019. The spectrograms exhibit banded structures, which consist of several strip elements that vary in time and frequency over the event duration. Statistical analysis of 95 events shows that they are observed in the frequency range that extends from 2 to ~37 kHz, and mainly appearing above 16 kHz. The events span from 4 to 110 min and occur in the evening sector (~17–01 magnetic local time), mostly during quiet geomagnetic conditions. Furthermore, they are primarily left‐handed polarized and are associated with bursts of lightning‐related radio emissions such as sferics and tweeks.

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Series: Geophysical research letters
ISSN: 0094-8276
ISSN-E: 1944-8007
ISSN-L: 0094-8276
Volume: 46
Issue: 24
Pages: 14214 - 14222
DOI: 10.1029/2019GL086127
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: E. L. M. was supported partially by the Finnish Cultural Foundation (grant 00180689). The work of F. N. was supported by Czech Science Foundation (grant 18‐00844S). O. S. and I. K. acknowledge Czech Science Foundation (grant 17‐07027S) and the Praemium Academiae award from the Czech Academy of Sciences.
Copyright information: © 2019. American Geophysical Union.