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The cusp: a window for particle exchange between the radiation belt and the solar wind
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| Zeitschriftentitel: | Annales Geophysicae |
|---|---|
| Personen und Körperschaften: | , , , , , |
| In: | Annales Geophysicae, 24, 2006, 11, S. 3131-3137 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Copernicus GmbH
|
| Schlagwörter: |
| author_facet |
Zhou, X.-Z. Fritz, T. A. Zong, Q.-G. Pu, Z. Y. Hao, Y.-Q. Cao, J.-B. Zhou, X.-Z. Fritz, T. A. Zong, Q.-G. Pu, Z. Y. Hao, Y.-Q. Cao, J.-B. |
|---|---|
| author |
Zhou, X.-Z. Fritz, T. A. Zong, Q.-G. Pu, Z. Y. Hao, Y.-Q. Cao, J.-B. |
| spellingShingle |
Zhou, X.-Z. Fritz, T. A. Zong, Q.-G. Pu, Z. Y. Hao, Y.-Q. Cao, J.-B. Annales Geophysicae The cusp: a window for particle exchange between the radiation belt and the solar wind Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geology Astronomy and Astrophysics |
| author_sort |
zhou, x.-z. |
| spelling |
Zhou, X.-Z. Fritz, T. A. Zong, Q.-G. Pu, Z. Y. Hao, Y.-Q. Cao, J.-B. 1432-0576 Copernicus GmbH Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geology Astronomy and Astrophysics http://dx.doi.org/10.5194/angeo-24-3131-2006 <jats:p>Abstract. 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. </jats:p> The cusp: a window for particle exchange between the radiation belt and the solar wind Annales Geophysicae |
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| title |
The cusp: a window for particle exchange between the radiation belt and the solar wind |
| title_unstemmed |
The cusp: a window for particle exchange between the radiation belt and the solar wind |
| title_full |
The cusp: a window for particle exchange between the radiation belt and the solar wind |
| title_fullStr |
The cusp: a window for particle exchange between the radiation belt and the solar wind |
| title_full_unstemmed |
The cusp: a window for particle exchange between the radiation belt and the solar wind |
| title_short |
The cusp: a window for particle exchange between the radiation belt and the solar wind |
| title_sort |
the cusp: a window for particle exchange between the radiation belt and the solar wind |
| topic |
Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geology Astronomy and Astrophysics |
| url |
http://dx.doi.org/10.5194/angeo-24-3131-2006 |
| publishDate |
2006 |
| physical |
3131-3137 |
| description |
<jats:p>Abstract. 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.
</jats:p> |
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| author | Zhou, X.-Z., Fritz, T. A., Zong, Q.-G., Pu, Z. Y., Hao, Y.-Q., Cao, J.-B. |
| author_facet | Zhou, X.-Z., Fritz, T. A., Zong, Q.-G., Pu, Z. Y., Hao, Y.-Q., Cao, J.-B., Zhou, X.-Z., Fritz, T. A., Zong, Q.-G., Pu, Z. Y., Hao, Y.-Q., Cao, J.-B. |
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| description | <jats:p>Abstract. 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. </jats:p> |
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| institution | DE-Gla1, DE-Zi4, DE-15, DE-Pl11, DE-Rs1, DE-105, DE-14, DE-Ch1, DE-L229, DE-D275, DE-Bn3, DE-Brt1, DE-D161, DE-Zwi2 |
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| spelling | Zhou, X.-Z. Fritz, T. A. Zong, Q.-G. Pu, Z. Y. Hao, Y.-Q. Cao, J.-B. 1432-0576 Copernicus GmbH Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geology Astronomy and Astrophysics http://dx.doi.org/10.5194/angeo-24-3131-2006 <jats:p>Abstract. 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. </jats:p> The cusp: a window for particle exchange between the radiation belt and the solar wind Annales Geophysicae |
| spellingShingle | Zhou, X.-Z., Fritz, T. A., Zong, Q.-G., Pu, Z. Y., Hao, Y.-Q., Cao, J.-B., Annales Geophysicae, The cusp: a window for particle exchange between the radiation belt and the solar wind, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Geology, Astronomy and Astrophysics |
| title | The cusp: a window for particle exchange between the radiation belt and the solar wind |
| title_full | The cusp: a window for particle exchange between the radiation belt and the solar wind |
| title_fullStr | The cusp: a window for particle exchange between the radiation belt and the solar wind |
| title_full_unstemmed | The cusp: a window for particle exchange between the radiation belt and the solar wind |
| title_short | The cusp: a window for particle exchange between the radiation belt and the solar wind |
| title_sort | the cusp: a window for particle exchange between the radiation belt and the solar wind |
| title_unstemmed | The cusp: a window for particle exchange between the radiation belt and the solar wind |
| topic | Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Geology, Astronomy and Astrophysics |
| url | http://dx.doi.org/10.5194/angeo-24-3131-2006 |