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High-latitude electron density obser...

Henize, Vance Karl.

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High-latitude electron density observations from the IMAGE radio plasma imager.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	High-latitude electron density observations from the IMAGE radio plasma imager./
作者:	Henize, Vance Karl.
面頁冊數:	143 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-05, Section: B, page: 2227.
Contained By:	Dissertation Abstracts International64-05B.
標題:	Physics, Astronomy and Astrophysics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3090157

High-latitude electron density observations from the IMAGE radio plasma imager.
Henize, Vance Karl.

High-latitude electron density observations from the IMAGE radio plasma imager. - 143 p.

Source: Dissertation Abstracts International, Volume: 64-05, Section: B, page: 2227.

Thesis (Ph.D.)--Rice University, 2003.

Before the IMAGE mission, electron densities in the high latitude, high altitude region of the magnetosphere were measured exclusively by <italic> in situ</italic> means. The Radio Plasma Imager instrument onboard IMAGE is capable of remotely observing electron densities between 0.01 and 100,000 e<super>−</super>/cm<super>−3</super> from distances of several Earth radii or more. This allows a global view of the high latitude region that has a far greater accuracy than was previously possible.Subjects--Topical Terms:

1019521
Physics, Astronomy and Astrophysics.

High-latitude electron density observations from the IMAGE radio plasma imager.
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100 1 $a Henize, Vance Karl. $3 1900008
245 1 0 $a High-latitude electron density observations from the IMAGE radio plasma imager.
300 $a 143 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-05, Section: B, page: 2227.
500 $a Adviser: Patricia Reiff.
502 $a Thesis (Ph.D.)--Rice University, 2003.
520 $a Before the IMAGE mission, electron densities in the high latitude, high altitude region of the magnetosphere were measured exclusively by <italic> in situ</italic> means. The Radio Plasma Imager instrument onboard IMAGE is capable of remotely observing electron densities between 0.01 and 100,000 e<super>−</super>/cm<super>−3</super> from distances of several Earth radii or more. This allows a global view of the high latitude region that has a far greater accuracy than was previously possible.
520 $a Soundings of the terrestrial magnetic cusp provide the first remote observations of the dynamics and poleward density profile of this feature continuously over a 60-minute interval. During steady quiet-time solar wind and interplanetary magnetic field conditions, the cusp is shown to be stable in both position and density structure with only slight variations in both. Peak electron densities within the cusp during this time are found to be somewhat higher than predicted.
520 $a New procedures for deriving electron densities from radio sounding measurements are developed. The addition of curve fitting algorithms significantly increases the amount of useable data. Incorporating forward modeling techniques greatly reduces the computational time over traditional inversion methods. These methods are described in detail.
520 $a A large number high latitude observations of ducted right-hand extraordinary mode waves made over the course of one year of the IMAGE mission are used to create a three dimensional model of the electron density profile of the terrestrial polar cap region. The dependence of electron density in the polar cap on average geocentric distance (<italic>d</italic>) is found to vary as <italic> d</italic><super>−6.6</super>. This is a significantly steeper gradient than cited in earlier works such as Persoon et al., although the introduction of an asymptotic term provides for basic agreement in the limited region of their joint validity. Latitudinal and longitudinal variations are found to be insignificant. Both the mean profile power law index of the electron density profile and, to a stronger degree, its variance show dependence with the DST index.
590 $a School code: 0187.
650 4 $a Physics, Astronomy and Astrophysics. $3 1019521
650 4 $a Physics, Fluid and Plasma. $3 1018402
650 4 $a Physics, Atmospheric Science. $3 1019431
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710 2 0 $a Rice University. $3 960124
773 0 $t Dissertation Abstracts International $g 64-05B.
790 1 0 $a Reiff, Patricia, $e advisor
790 $a 0187
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3090157