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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
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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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

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.

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

Antonova, A E. and Shabansky, V P.: Structure of the geomagnetic field at great distance from the Earth, Geomagn. Aeron., 8, 801–811, 1968.; Antonova, A E., Gubar, Y I., and Kropotkim, A P.: Energetic particle population in the high-latitude geomagnetosphere, Phys. Chem. Earth, 25, 47–50, 1999.; Cargill, P J., Lavraud, B., Owen, C J., Grison, B., Dunlop, M W., Cornilleau-Wehrlin, N., Escoubet, C P., Paschmann, G., Phan, T D., Rezeau, L., Bogdanova, Y., and Nykyri, K.: Cluster at the Magnetospheric Cusps, Space Sci. Rev., 118, 321–366, \doi10.1007/s11214-005-3835-0, 2005.; Delcourt, D C. and Sauvaud, J.-A.: Recirculation of plasma sheet particles into the high-latitude boundary layer, J. Geophys. Res., 103, 26 521–26 532, 1998.; Fritz, T A., Chen, J., and Sheldon, R B.: The Role of the Cusp as A Source for Magnetospheric Particles: A New Paradigm?, Adv. Space Res., 25, 1445–1457, 2000.; Delcourt, D C. and Sauvaud, J.-A.: Populating of Cusp and Boundary Layers by energetic (hundreds of keV) equatorial particles, J. Geophys. Res., 104, 22 635–22 648, 1999.; Fuselier, S A., Anderson, B J., and Onsager, T G.: Particle signatures of magnetic topology at the magnetopause: AMPTE/CCE observations, J. Geophys. Res., 100, 11 805–11 821, 1995.; Kirpichev, I., Fedorov, A., Grigoriev, A., Budnik, E., and Dubinin, E.: Quasi-trapping of Charged Particles in the Region of a Local Magnetic Field Minimum in the Outer Cusp, Cosmic Research, 37, 638–643, 1999.; Kremser, G., Woch, J., Mursula, K., Tanskanen, P., Wilken, B., and Lundin, R.: Origin of energetic ions in the polar cusp inferred from ion composition measurements by the Viking satellite, Ann. Geophys., 13, 595–607, 1995.; Lavraud, B. and Cargill, P J.: Cluster reveals the magnetospheric cusps, Astronomy and Geophysics, 46, 1.32–1.35, 2005.; Lavraud, B., Fedorov, A., Budnik, E., Grigoriev, A., Cargill, P J., Dunlop, M W., Rème, H., Dandouras, I., and Balogh, A.: Cluster survey of the high-altitude cusp properties: a three-year stastical study, Ann. Geophys., 22, 3009–3019, 2004.; Merka, J., Safránková, J., and Nemecek, Z.: Cusp-like plasma in high altitudes: a statistical study of the width and location of the cusp from Magion-4, Ann. Geophys., 20, 311–320, 2002.; Newell, P T. and Meng, C I.: Cusp Width and $B_z$: Observations and a Conceptual Model, J. Geophys. Res., 92, 13 673–13 678, 1987.; Papitashvili, V O. and Rich, F J.: High-latitude ionospheric convection models derived from Defense Meteorological Satellite Program ion drift observations and parameterized by the interplanetary magnetic field strength and direction, J. Geophys. Res., 107, doi:10.1029/2001JA000264, 2002.; Pugacheva, G., Gusev, A A., Jayanthi, U B., Schuch, N J., and Spjeldvik, W N.: Seasonal polar cap radiation zones in the dayside magnetosphere, Earth Planets Space, 56, e17–e20, 2004.; Pugacheva, G., Gusev, A A., Jayanthi, U B., Schuch, N J., and Spjeldvik, W N.: Cusp region radiation belts in the dayside magnetosphere, J. Atmos. Solar-Terr. Phys., 67, 479–487, 2005.; Shabansky, V P.: Some processes in the magnetosphere, Space Sci. Rev., 12, 299–418, 1971.; Sheldon, R B., Spence, H E., Sullivan, J D., Fritz, T A., and Chen, J.: The discovery of trapped energetic electrons in the outer cusp, Geophys. Res. Lett., 25, 1825–1828, 1998.; Tsyganenko, N A. and Russell, C T.: Magnetic signatures of the distant polar cusps: Observations by Polar and quantitative modeling, J. Geophys. Res., 104, 24 939–24 955, 1999.; Tsyganenko, N A. and Stern, D P.: Modeling the global magnetic field of the large-scale Birkeland current system, J. Geophys. Res., 101, 27 187–27 198, 1996.; Zhang, H., Fritz, T A., Zong, Q G., and Daly, P W.: Stagnant Exterior Cusp Region as Viewed by Energetic Electrons and Ions: A Statistical Study Using CLUSTER Researc


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