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The Plasma Physics Processes that Dr...
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Cash, Michele Diane.
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The Plasma Physics Processes that Drive Ring Current Enhancements during Geomagnetic Storms and Substorms.
紀錄類型:
書目-語言資料,印刷品 : Monograph/item
正題名/作者:
The Plasma Physics Processes that Drive Ring Current Enhancements during Geomagnetic Storms and Substorms./
作者:
Cash, Michele Diane.
面頁冊數:
173 p.
附註:
Source: Dissertation Abstracts International, Volume: 74-01(E), Section: B.
Contained By:
Dissertation Abstracts International74-01B(E).
標題:
Physics, Fluid and Plasma. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3521640
ISBN:
9781267529534
The Plasma Physics Processes that Drive Ring Current Enhancements during Geomagnetic Storms and Substorms.
Cash, Michele Diane.
The Plasma Physics Processes that Drive Ring Current Enhancements during Geomagnetic Storms and Substorms.
- 173 p.
Source: Dissertation Abstracts International, Volume: 74-01(E), Section: B.
Thesis (Ph.D.)--University of Washington, 2012.
Geomagnetic storms result when energetic particles of solar and ionospheric origin fill Earth's inner magnetosphere and create a strong westward current, known as the ring current. This dissertation presents results from investigating the plasma dynamics that contribute to the development of Earth's ring current from ionospheric outflow of H+ and O+ ions, and the role of ring current enhancements in the generation of geomagnetic storms and substorms. Modeling was carried via a combined multifluid and particle approach, which enables us to resolve the small-scale dynamics that are key to particle energization within the context of the global magnetosphere. The results presented in this dissertation substantially contribute to our understanding of the development and composition of the ring current during geomagnetic storms and substorms, and offer insight into the ionospheric sources regions for ring current ions, as well as the processes through which these particles are energized, injected, and trapped within the inner magnetosphere.
ISBN: 9781267529534Subjects--Topical Terms:
1018402
Physics, Fluid and Plasma.
The Plasma Physics Processes that Drive Ring Current Enhancements during Geomagnetic Storms and Substorms.
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Geomagnetic storms result when energetic particles of solar and ionospheric origin fill Earth's inner magnetosphere and create a strong westward current, known as the ring current. This dissertation presents results from investigating the plasma dynamics that contribute to the development of Earth's ring current from ionospheric outflow of H+ and O+ ions, and the role of ring current enhancements in the generation of geomagnetic storms and substorms. Modeling was carried via a combined multifluid and particle approach, which enables us to resolve the small-scale dynamics that are key to particle energization within the context of the global magnetosphere. The results presented in this dissertation substantially contribute to our understanding of the development and composition of the ring current during geomagnetic storms and substorms, and offer insight into the ionospheric sources regions for ring current ions, as well as the processes through which these particles are energized, injected, and trapped within the inner magnetosphere.
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This thesis presents results that show how small-scale particle dynamics within the current sheet, boundary layers, and reconnection regions drive the acceleration of ring current particles within the larger global context of the magnetosphere. Small-scale structures within the magnetotail are shown to be more important in determining when particles are accelerated than the time after particles are initialized in the ionosphere. It is also found that after a period of southward IMF, in which particle energization is observed, a northerly turning of the IMF is necessary in order to trap energetic particles in orbit around the Earth and form a symmetric ring current. Asymmetries in the acceleration mechanisms between ionospheric H+ and O + ions were observed with oxygen ions convecting duskward according to the cross-tail current and gaining more energy than protons, which moved earthward on reconnecting field lines and were accelerated closer to the plasma sheet inner boundary.
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