Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 36, issue 3
Articles | Volume 36, issue 3
https://doi.org/10.5194/angeo-36-915-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-36-915-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 36, issue 3
ANGEO Communicates
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21 Jun 2018
ANGEO Communicates | Highlight paper |  | 21 Jun 2018

New high-frequency (7–12 kHz) quasi-periodic VLF emissions observed on the ground at L  ∼  5.5

Jyrki Manninen, Natalia Kleimenova, Tauno Turunen, and Liudmila Gromova

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Latest update: 23 Oct 2025
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Short summary
We reveal previously unknown quasi-periodic (QP) VLF emissions at the unusually high-frequency band of ~ 7–11 kHz by applying the digital filtering of strong sferics to the ground-based VLF data recorded at Kannuslehto station (KAN). In one event, the spectral–temporal forms of the emissions looked like a series of giant bullets, with very abrupt cessation. In the second event, the modulation period was about 3 min under the absence of the simultaneous geomagnetic pulsations.
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