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Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field
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| Zeitschriftentitel: | Journal of Geophysical Research: Space Physics |
|---|---|
| Personen und Körperschaften: | , , , |
| In: | Journal of Geophysical Research: Space Physics, 112, 2007, A6 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
|
| Schlagwörter: |
| author_facet |
Zhou, X.‐Z. Pu, Z. Y. Zong, Q.‐G. Xie, L. Zhou, X.‐Z. Pu, Z. Y. Zong, Q.‐G. Xie, L. |
|---|---|
| author |
Zhou, X.‐Z. Pu, Z. Y. Zong, Q.‐G. Xie, L. |
| spellingShingle |
Zhou, X.‐Z. Pu, Z. Y. Zong, Q.‐G. Xie, L. Journal of Geophysical Research: Space Physics Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
| author_sort |
zhou, x.‐z. |
| spelling |
Zhou, X.‐Z. Pu, Z. Y. Zong, Q.‐G. Xie, L. 0148-0227 American Geophysical Union (AGU) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics http://dx.doi.org/10.1029/2006ja012180 <jats:p>Several mechanisms have been used to explain solar wind plasma entry into the plasma sheet in the magnetotail. In this paper, we focus on the gradient drift entry (GDE) process in the equatorial flanks of the magnetosphere, based on the magnetopause picture of a tangential discontinuity with a small tangential electric field as was suggested by Alfvén (1968). We discuss the GDE efficiency in different conditions using the adiabatic theory. It can be clearly shown that the GDE efficiency is much lower during southward interplanetary magnetic field (IMF), with a strong energy filter effect for incoming solar wind particles. Given a typical condition, a critical energy for particle entry is calculated to be several kiloelectron volts. Only those particles with higher energy can penetrate the magnetopause, a condition which can be also proved by test particle simulations. The lower efficiency than that during northward IMF during periods of southward IMF is in agreement with the different properties of the plasma sheet observed, i.e., hot and tenuous when the IMF is southward, cold and dense for northward IMF.</jats:p> Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field Journal of Geophysical Research: Space Physics |
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10.1029/2006ja012180 |
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Chemie und Pharmazie Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft Biologie Allgemeine Naturwissenschaft Physik Technik Geologie und Paläontologie Geographie |
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| title |
Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field |
| title_unstemmed |
Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field |
| title_full |
Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field |
| title_fullStr |
Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field |
| title_full_unstemmed |
Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field |
| title_short |
Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field |
| title_sort |
energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field |
| topic |
Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
| url |
http://dx.doi.org/10.1029/2006ja012180 |
| publishDate |
2007 |
| physical |
|
| description |
<jats:p>Several mechanisms have been used to explain solar wind plasma entry into the plasma sheet in the magnetotail. In this paper, we focus on the gradient drift entry (GDE) process in the equatorial flanks of the magnetosphere, based on the magnetopause picture of a tangential discontinuity with a small tangential electric field as was suggested by Alfvén (1968). We discuss the GDE efficiency in different conditions using the adiabatic theory. It can be clearly shown that the GDE efficiency is much lower during southward interplanetary magnetic field (IMF), with a strong energy filter effect for incoming solar wind particles. Given a typical condition, a critical energy for particle entry is calculated to be several kiloelectron volts. Only those particles with higher energy can penetrate the magnetopause, a condition which can be also proved by test particle simulations. The lower efficiency than that during northward IMF during periods of southward IMF is in agreement with the different properties of the plasma sheet observed, i.e., hot and tenuous when the IMF is southward, cold and dense for northward IMF.</jats:p> |
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| author | Zhou, X.‐Z., Pu, Z. Y., Zong, Q.‐G., Xie, L. |
| author_facet | Zhou, X.‐Z., Pu, Z. Y., Zong, Q.‐G., Xie, L., Zhou, X.‐Z., Pu, Z. Y., Zong, Q.‐G., Xie, L. |
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| description | <jats:p>Several mechanisms have been used to explain solar wind plasma entry into the plasma sheet in the magnetotail. In this paper, we focus on the gradient drift entry (GDE) process in the equatorial flanks of the magnetosphere, based on the magnetopause picture of a tangential discontinuity with a small tangential electric field as was suggested by Alfvén (1968). We discuss the GDE efficiency in different conditions using the adiabatic theory. It can be clearly shown that the GDE efficiency is much lower during southward interplanetary magnetic field (IMF), with a strong energy filter effect for incoming solar wind particles. Given a typical condition, a critical energy for particle entry is calculated to be several kiloelectron volts. Only those particles with higher energy can penetrate the magnetopause, a condition which can be also proved by test particle simulations. The lower efficiency than that during northward IMF during periods of southward IMF is in agreement with the different properties of the plasma sheet observed, i.e., hot and tenuous when the IMF is southward, cold and dense for northward IMF.</jats:p> |
| doi_str_mv | 10.1029/2006ja012180 |
| facet_avail | Online, Free |
| finc_class_facet | Chemie und Pharmazie, Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft, Biologie, Allgemeine Naturwissenschaft, Physik, Technik, Geologie und Paläontologie, Geographie |
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| series | Journal of Geophysical Research: Space Physics |
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| spelling | Zhou, X.‐Z. Pu, Z. Y. Zong, Q.‐G. Xie, L. 0148-0227 American Geophysical Union (AGU) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics http://dx.doi.org/10.1029/2006ja012180 <jats:p>Several mechanisms have been used to explain solar wind plasma entry into the plasma sheet in the magnetotail. In this paper, we focus on the gradient drift entry (GDE) process in the equatorial flanks of the magnetosphere, based on the magnetopause picture of a tangential discontinuity with a small tangential electric field as was suggested by Alfvén (1968). We discuss the GDE efficiency in different conditions using the adiabatic theory. It can be clearly shown that the GDE efficiency is much lower during southward interplanetary magnetic field (IMF), with a strong energy filter effect for incoming solar wind particles. Given a typical condition, a critical energy for particle entry is calculated to be several kiloelectron volts. Only those particles with higher energy can penetrate the magnetopause, a condition which can be also proved by test particle simulations. The lower efficiency than that during northward IMF during periods of southward IMF is in agreement with the different properties of the plasma sheet observed, i.e., hot and tenuous when the IMF is southward, cold and dense for northward IMF.</jats:p> Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field Journal of Geophysical Research: Space Physics |
| spellingShingle | Zhou, X.‐Z., Pu, Z. Y., Zong, Q.‐G., Xie, L., Journal of Geophysical Research: Space Physics, Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field, Paleontology, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Earth-Surface Processes, Geochemistry and Petrology, Soil Science, Water Science and Technology, Ecology, Aquatic Science, Forestry, Oceanography, Geophysics |
| title | Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field |
| title_full | Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field |
| title_fullStr | Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field |
| title_full_unstemmed | Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field |
| title_short | Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field |
| title_sort | energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field |
| title_unstemmed | Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field |
| topic | Paleontology, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Earth-Surface Processes, Geochemistry and Petrology, Soil Science, Water Science and Technology, Ecology, Aquatic Science, Forestry, Oceanography, Geophysics |
| url | http://dx.doi.org/10.1029/2006ja012180 |