Articles | Volume 33, issue 8
ANGEO Communicates
12 Aug 2015
ANGEO Communicates |  | 12 Aug 2015

Strange VLF bursts in northern Scandinavia: case study of the afternoon "mushroom-like" hiss on 8 December 2013

J. Manninen, N. G. Kleimenova, A. Kozlovsky, I. A. Kornilov, L. I. Gromova, Y. V. Fedorenko, and T. Turunen

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New high-frequency (7–12 kHz) quasi-periodic VLF emissions observed on the ground at L  ∼  5.5
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New results of structured VLF emissions observed simultaneously at two closely located stations near L ~ 5.5
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New type of ensemble of quasi-periodic, long-lasting VLF emissions at the auroral zone
J. Manninen, N. G. Kleimenova, and O. V. Kozyreva
Ann. Geophys., 30, 1655–1660,,, 2012
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A non-typical 1-4 kHz hiss was studied. It shows a sequence of separated noise bursts with strange “mushroom-like” shapes in the frequency-time domain, each lasting several minutes. This sequence could be a result of the modulation of the VLF hiss electron-cyclotron instability by Pc5 geomagnetic pulsations. This strange “mushroom-like” shape of the considered VLF hiss could be a combined mutual effect of the magnetospheric ULF-VLF wave interaction and the ionosphere waveguide propagation.