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In situ analysis of measurements of ...
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Mella, Meghan R.
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In situ analysis of measurements of auroral dynamics and structure.
紀錄類型:
書目-語言資料,印刷品 : Monograph/item
正題名/作者:
In situ analysis of measurements of auroral dynamics and structure./
作者:
Mella, Meghan R.
面頁冊數:
169 p.
附註:
Source: Dissertation Abstracts International, Volume: 74-06(E), Section: B.
Contained By:
Dissertation Abstracts International74-06B(E).
標題:
Physics, Fluid and Plasma. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3553880
ISBN:
9781267935625
In situ analysis of measurements of auroral dynamics and structure.
Mella, Meghan R.
In situ analysis of measurements of auroral dynamics and structure.
- 169 p.
Source: Dissertation Abstracts International, Volume: 74-06(E), Section: B.
Thesis (Ph.D.)--Dartmouth College, 2012.
Two auroral sounding rocket case studies, one in the dayside and one in the nightside, explore aspects of poleward boundary aurora. The nightside sounding rocket, Cascades-2 was launched on 20 March 2009 at 11:04:00 UT from the Poker Flat Research Range in Alaska, and flew across a series of poleward boundary intensifications (PBIs). Each of the crossings have fundamentally different in situ electron energy and pitch angle structure, and different ground optics images of visible aurora. The different particle distributions show signatures of both a quasistatic acceleration mechanism and an Alfvenic acceleration mechanism, as well as combinations of both. The Cascades-2 experiment is the first sounding rocket observation of a PBI sequence, enabling a detailed investigation of the electron signatures and optical aurora associated with various stages of a PBI sequence as it evolves from an Alfvenic to a more quasistatic structure.
ISBN: 9781267935625Subjects--Topical Terms:
1018402
Physics, Fluid and Plasma.
In situ analysis of measurements of auroral dynamics and structure.
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In situ analysis of measurements of auroral dynamics and structure.
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Source: Dissertation Abstracts International, Volume: 74-06(E), Section: B.
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Adviser: Kristina A. Lynch.
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Thesis (Ph.D.)--Dartmouth College, 2012.
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Two auroral sounding rocket case studies, one in the dayside and one in the nightside, explore aspects of poleward boundary aurora. The nightside sounding rocket, Cascades-2 was launched on 20 March 2009 at 11:04:00 UT from the Poker Flat Research Range in Alaska, and flew across a series of poleward boundary intensifications (PBIs). Each of the crossings have fundamentally different in situ electron energy and pitch angle structure, and different ground optics images of visible aurora. The different particle distributions show signatures of both a quasistatic acceleration mechanism and an Alfvenic acceleration mechanism, as well as combinations of both. The Cascades-2 experiment is the first sounding rocket observation of a PBI sequence, enabling a detailed investigation of the electron signatures and optical aurora associated with various stages of a PBI sequence as it evolves from an Alfvenic to a more quasistatic structure.
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The dayside sounding rocket, Scifer-2 was launched on 18 January 2008 at 7:30 UT from the Andoya Rocket Range in Andenes, Norway. It flew northward through the cleft region during a Poleward Moving Auroral Form (PMAF) event. Both the dayside and nightside flights observe dispersed, precipitating ions, each of a different nature. The dispersion signatures are dependent on, among other things, the MLT sector, altitude, source region, and precipitation mechanism. It is found that small changes in the shape of the dispersion have a large influence on whether the precipitation was localized or extended over a range of altitudes. It is also found that a single Maxwellian source will not replicate the data, but rather, a sum of Maxwellians of different temperature, similar to a Kappa distribution, most closely reproduces the data.
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The various particle signatures are used to argue that both events have similar magnetospheric drivers, that is, Bursty Bulk Flows in the magnetotail.
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