Articles | Volume 33, issue 8
Ann. Geophys., 33, 991–995, 2015
Ann. Geophys., 33, 991–995, 2015

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 et al.

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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.