VLF Emissions With Banded Structure in the 16- to 39-kHz Frequency Range Measured by a High-Latitude Ground-Based Receiver

Edith L. Macotela, František Němec, Jyrki Manninen, Ondřej Santolík, Ivana Kolmašová, Tauno Turunen

Research output: Contribution to journalArticlepeer-review

2 Citations (SciVal)

Abstract

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.

Original languageEnglish
Pages (from-to)14214-14222
Number of pages9
JournalGeophysical Research Letters
Volume46
Issue number24
DOIs
Publication statusPublished - 28 Dec 2019

Bibliographical note

Funding Information:
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. We thank Jan Záhlava for elaborating the maps of lightning location. We thank the institutes who maintain the IMAGE Magnetometer Array. We thank NOAA/NGDC for providing the TED measurements from NOAA/POES satellites. Data availability is described at http://www.sgo.fi/Data/archive.php (VLF, riometer and ionosonde data), https://www.ngdc.noaa.gov/stp/satellite/poes/ (POES), http://space.fmi.fi/image/www/index.php?page=request (IMAGE), and https://omniweb.gsfc.nasa.gov/form/dx1.html (OMNIWeb, Geomagnetic indices)

Funding Information:
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. We thank Jan Záhlava for elaborating the maps of lightning location. We thank the institutes who maintain the IMAGE Magnetometer Array. We thank NOAA/NGDC for providing the TED measurements from NOAA/POES satellites. Data availability is described at http://www.sgo.fi/Data/archive.php (VLF, riometer and ionosonde data), https://www.ngdc.noaa.gov/stp/satellite/poes/ (POES), http://space.fmi.fi/image/www/index.php?page=request (IMAGE), and https://omniweb.gsfc.nasa.gov/form/dx1.html (OMNIWeb, Geomagnetic indices)

Publisher Copyright:
©2019. American Geophysical Union. All Rights Reserved.

ASJC Scopus subject areas

  • Geophysics
  • General Earth and Planetary Sciences

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