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Anomalous Width Variation of Rarefactive Ion Acoustic Solitary Waves in the Context of Auroral Plasmas : Volume 11, Issue 2 (14/04/2004)

By Ghosh, S. S.

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Book Id: WPLBN0004019596
Format Type: PDF Article :
File Size: Pages 10
Reproduction Date: 2015

Title: Anomalous Width Variation of Rarefactive Ion Acoustic Solitary Waves in the Context of Auroral Plasmas : Volume 11, Issue 2 (14/04/2004)  
Author: Ghosh, S. S.
Volume: Vol. 11, Issue 2
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2004
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Ghosh, S. S., & Lakhina, G. S. (2004). Anomalous Width Variation of Rarefactive Ion Acoustic Solitary Waves in the Context of Auroral Plasmas : Volume 11, Issue 2 (14/04/2004). Retrieved from http://hawaiilibrary.net/


Description
Description: Indian Institute of Geomagnetism, Kalamboli, New Panvel (W), Navi Mumbai, 410 218, India. The presence of dynamic, large amplitude solitary waves in the auroral regions of space is well known. Since their velocities are of the order of the ion acoustic speed, they may well be considered as being generated from the nonlinear evolution of ion acoustic waves. However, they do not show the expected width-amplitude correlation for K-dV solitons. Recent POLAR observations have actually revealed that the low altitude rarefactive ion acoustic solitary waves are associated with an increase in the width with increasing amplitude. This indicates that a weakly nonlinear theory is not appropriate to describe the solitary structures in the auroral regions. In the present work, a fully nonlinear analysis based on Sagdeev pseudopotential technique has been adopted for both parallel and oblique propagation of rarefactive solitary waves in a two electron temperature multi-ion plasma. The large amplitude solutions have consistently shown an increase in the width with increasing amplitude. The width-amplitude variation profile of obliquely propagating rarefactive solitary waves in a magnetized plasma have been compared with the recent POLAR observations. The width-amplitude variation pattern is found to fit well with the analytical results. It indicates that a fully nonlinear theory of ion acoustic solitary waves may well explain the observed anomalous width variations of large amplitude structures in the auroral region.

Summary
Anomalous width variation of rarefactive ion acoustic solitary waves in the context of auroral plasmas

 

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