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Investigation of Vertical Mass Trans...

Johnsrud, T. F.

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Investigation of Vertical Mass Transport and Composition of the Mixed Gas in the Thermosphere.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Investigation of Vertical Mass Transport and Composition of the Mixed Gas in the Thermosphere./
Author:	Johnsrud, T. F.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	53 p.
Notes:	Source: Masters Abstracts International, Volume: 81-03.
Contained By:	Masters Abstracts International81-03.
Subject:	Atmospheric sciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13864550
ISBN:	9781085622929

Investigation of Vertical Mass Transport and Composition of the Mixed Gas in the Thermosphere.
Johnsrud, T. F.

Investigation of Vertical Mass Transport and Composition of the Mixed Gas in the Thermosphere. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 53 p.

Source: Masters Abstracts International, Volume: 81-03.

Thesis (M.S.)--University of Colorado at Boulder, 2019.

This item must not be sold to any third party vendors.

To better deal with the difficult problem of satellite drag and orbit prediction, this thesis derives and presents an improved way of looking at vertical mass transport and composition in the thermosphere, as well illustrates why helium behaves inversely to the major neutral species in the thermosphere. Scale height analysis shows that helium concentrations at 400km can be related to large scale height perturbations from diffusive equilibrium. A study of molecular, thermal, and eddy diffusion show that the magnitude of the effect of each process varies according to the scale height perturbation from diffusive equilibrium, and that molecular diffusion dominates in the thermosphere, especially at high altitudes. Comparison against the atmospheric model TIEGCM show agreement with the derivation's implications for vertical winds and the inverse behavior of helium, while comparison with the MSIS model shows that an averaged empirical model does not have the fidelity necessary to resolve individual transport processes.

ISBN: 9781085622929Subjects--Topical Terms:

3168354
Atmospheric sciences.
Subjects--Index Terms:

Helium

Investigation of Vertical Mass Transport and Composition of the Mixed Gas in the Thermosphere.
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245 1 0 $a Investigation of Vertical Mass Transport and Composition of the Mixed Gas in the Thermosphere.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 53 p.
500 $a Source: Masters Abstracts International, Volume: 81-03.
500 $a Advisor: Thayer, Jeffrey P.
502 $a Thesis (M.S.)--University of Colorado at Boulder, 2019.
506 $a This item must not be sold to any third party vendors.
520 $a To better deal with the difficult problem of satellite drag and orbit prediction, this thesis derives and presents an improved way of looking at vertical mass transport and composition in the thermosphere, as well illustrates why helium behaves inversely to the major neutral species in the thermosphere. Scale height analysis shows that helium concentrations at 400km can be related to large scale height perturbations from diffusive equilibrium. A study of molecular, thermal, and eddy diffusion show that the magnitude of the effect of each process varies according to the scale height perturbation from diffusive equilibrium, and that molecular diffusion dominates in the thermosphere, especially at high altitudes. Comparison against the atmospheric model TIEGCM show agreement with the derivation's implications for vertical winds and the inverse behavior of helium, while comparison with the MSIS model shows that an averaged empirical model does not have the fidelity necessary to resolve individual transport processes.
590 $a School code: 0051.
650 4 $a Atmospheric sciences. $3 3168354
650 4 $a Aerospace engineering. $3 1002622
653 $a Helium
653 $a Thermosphere
653 $a Transport
690 $a 0725
690 $a 0538
710 2 $a University of Colorado at Boulder. $b Aerospace Engineering. $3 1030473
773 0 $t Masters Abstracts International $g 81-03.
790 $a 0051
791 $a M.S.
792 $a 2019
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13864550