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Temporal and spatial distribution of...

The Catholic University of America.

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Temporal and spatial distribution of metallic species in the upper atmosphere.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Temporal and spatial distribution of metallic species in the upper atmosphere./
作者:	Correira, John Thomas.
面頁冊數:	133 p.
附註:	Adviser: Arthur C. Aiken.
Contained By:	Dissertation Abstracts International70-07B.
標題:	Atmospheric Sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3365380
ISBN:	9781109259322

Temporal and spatial distribution of metallic species in the upper atmosphere.
Correira, John Thomas.

Temporal and spatial distribution of metallic species in the upper atmosphere. - 133 p.

Adviser: Arthur C. Aiken.

Thesis (Ph.D.)--The Catholic University of America, 2009.

Every day the Earth is bombarded by approximately 100 tons of meteoric material. Much of this material is completely ablated on atmospheric entry, resulting in a layer of atomic metals in the upper atmosphere between 70 km - 150 km. These neutral atoms are ionized by solar radiation and charge exchange. Metal ions have a long lifetime against recombination loss, allowing them to be redistributed globally by electromagnetic forces, especially when lifted to altitudes >150 km.

ISBN: 9781109259322Subjects--Topical Terms:

1019179
Atmospheric Sciences.

Temporal and spatial distribution of metallic species in the upper atmosphere.
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245 1 0 $a Temporal and spatial distribution of metallic species in the upper atmosphere.
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520 $a Every day the Earth is bombarded by approximately 100 tons of meteoric material. Much of this material is completely ablated on atmospheric entry, resulting in a layer of atomic metals in the upper atmosphere between 70 km - 150 km. These neutral atoms are ionized by solar radiation and charge exchange. Metal ions have a long lifetime against recombination loss, allowing them to be redistributed globally by electromagnetic forces, especially when lifted to altitudes >150 km.
520 $a UV radiances from the Global Ozone Monitoring Experiment (GOME) spectrometer are used to determine long-term dayside variations of the total vertical column density below 795 km of the meteoric metal species Mg and Mg+ in the upper atmosphere. A retrieval algorithm developed to determine magnesium column densities was applied to all available data from the years 1996-2001. Long term results show middle latitude dayside Mg+ peaks in vertical content during the summer, while neutral Mg demonstrates a much more subtle maximum in summer. Atmospheric metal concentrations do not correlate strongly solar activity. An analysis of spatial variations shows geospatial distributions are patchy, with local regions of increased column density. To study short term variations and the role of meteor showers a time dependent mass flux rate is calculated using published estimates of meteor stream mass densities and activity profiles. An average daily mass flux rate is also calculated and used as a baseline against which shower mass flux rates are compared. These theoretical mass flux rates are then compared with GOME derived metal column densities. There appears to be little correlation between modeled meteor shower mass flux rates and changes in the observed neutral magnesium and Mg + metal column densities.
590 $a School code: 0043.
650 4 $a Atmospheric Sciences. $3 1019179
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