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Ulf Hydromagnetic Oscillations with the Discrete Spectrum as Eigenmodes of Mhd-resonator in the Near-earth Part of the Plasma Sheet : Volume 24, Issue 6 (03/07/2006)

By Mazur, V. A.

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Book Id: WPLBN0003993095
Format Type: PDF Article :
File Size: Pages 10
Reproduction Date: 2015

Title: Ulf Hydromagnetic Oscillations with the Discrete Spectrum as Eigenmodes of Mhd-resonator in the Near-earth Part of the Plasma Sheet : Volume 24, Issue 6 (03/07/2006)  
Author: Mazur, V. A.
Volume: Vol. 24, Issue 6
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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Mazur, V. A., & Leonovich, A. S. (2006). Ulf Hydromagnetic Oscillations with the Discrete Spectrum as Eigenmodes of Mhd-resonator in the Near-earth Part of the Plasma Sheet : Volume 24, Issue 6 (03/07/2006). Retrieved from http://members.worldlibrary.net/


Description
Description: Institute of Solar-Terrestrial Physics (ISTP), Russian Academy of Science, Siberian Branch, Irkutsk 33, 664033, Russia. A new concept is proposed for the emergence of ULF geomagnetic oscillations with a discrete spectrum of frequencies (0.8, 1.3, 1.9, 2.6 ...mHz) registered in the magnetosphere's midnight-morning sector. The concept relies on the assumption that these oscillations are MHD-resonator eigenmodes in the near-Earth plasma sheet. This magnetospheric area is where conditions are met for fast magnetosonic waves to be confined. The confinement is a result of the velocity values of fast magnetosonic waves in the near-Earth plasma sheet which differ greatly from those in the magnetotail lobes, leading to turning points forming in the tailward direction for the waves under study. To compute the eigenfrequency spectrum of such a resonator, we used a model magnetosphere with parabolic geometry. The fundamental harmonics of this resonator's eigenfrequencies are shown to be capable of being clustered into groups with average frequencies matching, with good accuracy, the frequencies of the observed oscillations. A possible explanation for the stability of the observed oscillation frequencies is that such a resonator might only form when the magnetosphere is in a certain unperturbed state.

Summary
ULF hydromagnetic oscillations with the discrete spectrum as eigenmodes of MHD-resonator in the near-Earth part of the plasma sheet

 

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