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On the dynamics and instabilities of...

Martinis, Carlos R.

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On the dynamics and instabilities of the low latitude ionosphere.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	On the dynamics and instabilities of the low latitude ionosphere./
作者:	Martinis, Carlos R.
面頁冊數:	166 p.
附註:	Source: Dissertation Abstracts International, Volume: 67-04, Section: B, page: 2040.
Contained By:	Dissertation Abstracts International67-04B.
標題:	Geophysics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3214963
ISBN:	9780542661709

On the dynamics and instabilities of the low latitude ionosphere.
Martinis, Carlos R.

On the dynamics and instabilities of the low latitude ionosphere. - 166 p.

Source: Dissertation Abstracts International, Volume: 67-04, Section: B, page: 2040.

Thesis (Ph.D.)--Boston University, 2006.

The Ionosphere is a region in the upper atmosphere that results from solar radiation acting upon the neutral gases existing there. The created ions and electrons form the ionospheric plasma that coexists and interacts with the neutral gases. This dissertation deals with the dynamics of the low latitude ionosphere, a region near the magnetic equator, where the Earth's magnetic field lines are almost horizontal and thus perpendicular to gravity and the gradients of electron density.

ISBN: 9780542661709Subjects--Topical Terms:

535228
Geophysics.

On the dynamics and instabilities of the low latitude ionosphere.
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245 1 0 $a On the dynamics and instabilities of the low latitude ionosphere.
300 $a 166 p.
500 $a Source: Dissertation Abstracts International, Volume: 67-04, Section: B, page: 2040.
500 $a Adviser: Michael Mendillo.
502 $a Thesis (Ph.D.)--Boston University, 2006.
520 $a The Ionosphere is a region in the upper atmosphere that results from solar radiation acting upon the neutral gases existing there. The created ions and electrons form the ionospheric plasma that coexists and interacts with the neutral gases. This dissertation deals with the dynamics of the low latitude ionosphere, a region near the magnetic equator, where the Earth's magnetic field lines are almost horizontal and thus perpendicular to gravity and the gradients of electron density.
520 $a Winds generated by the daily thermal expansion of the upper atmosphere affect the motion of the ionospheric plasma and vice versa. The unique magnetic field geometry existing in the low latitude ionosphere leads to a latitudinal re-distribution of the ionosphere, and this pattern affects the winds via a mechanism called ion-drag. The initial results from this dissertation come from the first multi-site, ground-based measurements of eastward winds in the same longitude sector at low latitudes. Airglow emissions serve as tracers of the motions of the atmosphere. Observations of these emissions, made from two observatories in South-America, reveal a latitude structure of the winds that is inconsistent with current models due to their inadequate representation of ion-drag.
520 $a Imaging systems are used to broaden this approach to the first study of the latitude dependence of zonal plasma drifts by following the motions of airglow structures from two different locations. The results obtained show only partial agreement with state-of-the-art models, indicating that the electric fields are not adequately represented in the models.
520 $a In addition to the horizontal motion of neutral and charged particles, there is vertical motion of ionospheric plasma that can lead to the occurrence of plasma instabilities. These instabilities have dramatic consequences, not only on the overall dynamics of the region, but also on the use of navigational and communication satellites. The focus of this part of the dissertation is on effects of geomagnetic storms in the triggering or suppression of plasma instabilities by vertical drifts. A synthesis that explains the net effects of prompt and delayed effects is offered, and their connection to solar wind parameters is presented.
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