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Evidence of Standing Waves During a Pi2 Pulsation Event Observed on Cluster : Volume 24, Issue 10 (20/10/2006)

By Collier, A. B.

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Book Id: WPLBN0004001354
Format Type: PDF Article :
File Size: Pages 15
Reproduction Date: 2015

Title: Evidence of Standing Waves During a Pi2 Pulsation Event Observed on Cluster : Volume 24, Issue 10 (20/10/2006)  
Author: Collier, A. B.
Volume: Vol. 24, Issue 10
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2006
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Blomberg, L. G., Sutcliffe, P. R., Collier, A. B., & W. Hughe, A. R. (2006). Evidence of Standing Waves During a Pi2 Pulsation Event Observed on Cluster : Volume 24, Issue 10 (20/10/2006). Retrieved from http://worldlibrary.net/


Description
Description: School of Physics, University of KwaZulu-Natal, Durban, South Africa. Observations of Pi2 pulsations at middle and low latitudes have been explained in terms of cavity mode resonances, whereas transients associated with field-aligned currents appear to be responsible for the high latitude Pi2 signature.

Data from Cluster are used to study a Pi2 event observed at 18:09 UTC on 21 January 2003, when three of the satellites were within the plasmasphere (L=4.7, 4.5 and 4.6) while the fourth was on the plasmapause or in the plasmatrough (L=6.6). Simultaneous pulsations at ground observatories and the injection of particles at geosynchronous orbit corroborate the occurrence of a substorm.

Evidence of a cavity mode resonance is established by considering the phase relationship between the orthogonal electric and magnetic field components associated with radial and field-aligned standing waves. The relative phase between satellites located on either side of the geomagnetic equator indicates that the field-aligned oscillation is an odd harmonic. Finite azimuthal Poynting flux suggests that the cavity is effectively open ended and the azimuthal wave number is estimated as m~13.5.

Summary
Evidence of standing waves during a Pi2 pulsation event observed on Cluster

Excerpt
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