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Cluster Observations of Sudden Impulses in the Magnetotail Caused by Interplanetary Shocks and Pressure Increases : Volume 23, Issue 2 (28/02/2005)

By Huttunen, K. E. J.

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Book Id: WPLBN0003989844
Format Type: PDF Article :
File Size: Pages 16
Reproduction Date: 2015

Title: Cluster Observations of Sudden Impulses in the Magnetotail Caused by Interplanetary Shocks and Pressure Increases : Volume 23, Issue 2 (28/02/2005)  
Author: Huttunen, K. E. J.
Volume: Vol. 23, Issue 2
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2005
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Collier, M., Tanskanen, E., J. Koskine, H. E., Balogh, A., Rème, H., J. Huttune, K. E.,...Slavin, J. (2005). Cluster Observations of Sudden Impulses in the Magnetotail Caused by Interplanetary Shocks and Pressure Increases : Volume 23, Issue 2 (28/02/2005). Retrieved from http://members.worldlibrary.net/


Description
Description: Department of Physical Sciences, P.O. Box 64, FIN-00014 University of Helsinki, Finland. Sudden impulses (SI) in the tail lobe magnetic field associated with solar wind pressure enhancements are investigated using measurements from Cluster. The magnetic field components during the SIs change in a manner consistent with the assumption that an antisunward moving lateral pressure enhancement compresses the magnetotail axisymmetrically. We found that the maximum variance SI unit vectors were nearly aligned with the associated interplanetary shock normals. For two of the tail lobe SI events during which Cluster was located close to the tail boundary, Cluster observed the inward moving magnetopause. During both events, the spacecraft location changed from the lobe to the magnetospheric boundary layer. During the event on 6 November 2001 the magnetopause was compressed past Cluster. We applied the 2-D Cartesian model developed by collier98 in which a vacuum uniform tail lobe magnetic field is compressed by a step-like pressure increase. The model underestimates the compression of the magnetic field, but it fits the magnetic field maximum variance component well. For events for which we could determine the shock normal orientation, the differences between the observed and calculated shock propagation times from the location of WIND/Geotail to the location of Cluster were small. The propagation speeds of the SIs between the Cluster spacecraft were comparable to the solar wind speed. Our results suggest that the observed tail lobe SIs are due to lateral increases in solar wind dynamic pressure outside the magnetotail boundary.

Summary
Cluster observations of sudden impulses in the magnetotail caused by interplanetary shocks and pressure increases


 

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