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The Cusp: a Window for Particle Exchange Between the Radiation Belt and the Solar Wind : Volume 24, Issue 11 (22/11/2006)

By Zhou, X.-z.

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Book Id: WPLBN0004001388
Format Type: PDF Article :
File Size: Pages 7
Reproduction Date: 2015

Title: The Cusp: a Window for Particle Exchange Between the Radiation Belt and the Solar Wind : Volume 24, Issue 11 (22/11/2006)  
Author: Zhou, X.-z.
Volume: Vol. 24, Issue 11
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2006
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Fritz, T. A., Cao, J., Pu, Z. Y., Zhou, X., Zong, Q., & Hao, Y. (2006). The Cusp: a Window for Particle Exchange Between the Radiation Belt and the Solar Wind : Volume 24, Issue 11 (22/11/2006). Retrieved from http://ebook.worldlibrary.net/


Description
Description: Institute of Space Physics and Applied Technology, Peking University, Beijing 100871, China. The study focuses on a single particle dynamics in the cusp region. The topology of the cusp region in terms of magnetic field iso-B contours has been studied using the Tsyganenko 96 model (T96) as an example, to show the importance of an off-equatorial minimum on particle trapping. We carry out test particle simulations to demonstrate the bounce and drift motion. The cusp trapping limit concept is introduced to reflect the particle motion in the high latitude magnetospheric region. The spatial distribution of the cusp trapping limit shows that only those particles with near 90° pitch-angles can be trapped and drift around the cusp. Those with smaller pitch angles may be partly trapped in the iso-B contours, however, they will eventually escape along one of the magnetic field lines. There exist both open field lines and closed ones within the same drift orbit, indicating two possible destinations of these particles: those particles being lost along open field lines will be connected to the surface of the magnetopause and the solar wind, while those along closed ones will enter the equatorial radiation belt. Thus, it is believed that the cusp region can provide a window for particle exchange between these two regions. Some of the factors, such as dipole tilt angle, magnetospheric convection, IMF and the Birkeland current system, may influence the cusp's trapping capability and therefore affect the particle exchanging mechanism. Their roles are examined by both the analysis of cusp magnetic topology and test particle simulations.

Summary
The cusp: a window for particle exchange between the radiation belt and the solar wind

Excerpt
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