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Experimental Evidence of the Simultaneous Occurrence of Vlf Chorus on the Ground in the Global Azimuthal Scale – from Pre-midnight to the Late Morning : Volume 30, Issue 4 (24/04/2012)

By Manninen, J.

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Book Id: WPLBN0004002160
Format Type: PDF Article :
File Size: Pages 8
Reproduction Date: 2015

Title: Experimental Evidence of the Simultaneous Occurrence of Vlf Chorus on the Ground in the Global Azimuthal Scale – from Pre-midnight to the Late Morning : Volume 30, Issue 4 (24/04/2012)  
Author: Manninen, J.
Volume: Vol. 30, Issue 4
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Parrot, M., Turunen, T., Kozyreva, O. V., Kleimenova, N. G., Raita, T., & Manninen, J. (2012). Experimental Evidence of the Simultaneous Occurrence of Vlf Chorus on the Ground in the Global Azimuthal Scale – from Pre-midnight to the Late Morning : Volume 30, Issue 4 (24/04/2012). Retrieved from

Description: Sodankylä Geophysical Observatory, Finland. Night-time VLF (very low frequency) chorus bursts lasting about one hour have been recorded at Finnish temporal station Kannuslehto (CGM: 64.2°; 107.9°, L = 5.3) during two VLF campaigns (on 25 February–4 March 2008 and 27 March–17 April 2011). The chorus bursts were associated with substorm development. They were accompanied by riometer absorption enhancements, which occurred simultaneously within as large longitude areas as from pre-midnight (Sodankylä, ~22:00 MLT) to the late morning (Tixie, ~03:00 MLT and Gakona, ~08:00 MLT) longitudes. It was found that the pre-midnight chorus observed on the ground occurred simultaneously with VLF chorus emissions recorded in the late morning on the low-altitude DEMETER satellite crossing the similar geomagnetic latitudes on the opposite local time sector. For the first time some evidence of simultaneous chorus burst generation in the global longitudinal scale was found (from pre-midnight to the late morning) by using direct comparison with satellite data as well as using non-direct indicator–azimuthally extended riometer absorption enhancements.

Experimental evidence of the simultaneous occurrence of VLF chorus on the ground in the global azimuthal scale – from pre-midnight to the late morning

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