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Polarisation and Propagation of Lion Roars in the Dusk Side Magnetosheath : Volume 19, Issue 10/12 (30/11/-0001)

By Maksimovic, M.

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Book Id: WPLBN0004000821
Format Type: PDF Article :
File Size: Pages 10
Reproduction Date: 2015

Title: Polarisation and Propagation of Lion Roars in the Dusk Side Magnetosheath : Volume 19, Issue 10/12 (30/11/-0001)  
Author: Maksimovic, M.
Volume: Vol. 19, Issue 10/12
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Santolík, O., Lacombe, C., Hubert, D., Dandouras, I., Lucek, E. A., Maksimovic, M.,...Harvey, C. C. (-0001). Polarisation and Propagation of Lion Roars in the Dusk Side Magnetosheath : Volume 19, Issue 10/12 (30/11/-0001). Retrieved from

Description: DESPA, Observatoire de Paris, France. We present observations of "lion roars" obtained in the magnetosheath by the Spectrum Analyser (SA) of the Spatio-Temporal Analysis of Field Fluctuations (STAFF) experiment aboard Cluster. STAFF-SA calculates, in near real time, the complete auto- and cross-spectral matrix derived from three magnetic and two electric components of the electromagnetic field at 27 frequencies in the range of 8 Hz to 4 kHz. This allows the study of the properties of whistler mode waves and more particularly, the properties of "lion roars", which are intense, short-duration, narrow-banded packets of whistler waves. Their presence is favoured by the magnetic field troughs associated with mirror mode structures. During two short periods of well-defined mirror modes, we study the depth δB/B of the magnetic troughs, and the direction of propagation of the lion roars. During the first period, close to the magnetopause, deep magnetic troughs pass the satellites. Lion roars are then observed to propagate simultaneously in two directions, roughly parallel and anti-parallel to the magnetic field: this probably indicates that during this period, the satellites were within the successive source regions of lion roars. For the second period, far from the magnetopause, the magnetic troughs are less deep. Lion roars are propagating in only one direction, roughly anti-parallel to the magnetic field, suggesting that the source regions are more distant and predominantly on one side of the satellites.

Key words. Magnetospheric physics (magnetosheath; plasma waves and instabilities) Radio science (radiowave propagation)

Polarisation and propagation of lion roars in the dusk side magnetosheath


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