Study of the Equatorial Ionosphere: The Equatorial Evening Minimum in the Total Electron Content of the Ionosphere and Its Role in Equatorial Scintillation

A minimum in the total electron content of the equatorial ionosphere frequently appears shortly after sunset in measurements of Faraday rotation made at Legon, Ghana (latitude 5.63 deg N, longitude -0.19 deg E, magnetic dip 8 deg S). This paper describes the phenomenon and investigates its occurrenc...

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1. Verfasser:	Koster,John R
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Sprache:	eng
Schlagworte:	Atmospheric Physics Circulation cell ELECTRON DENSITY EQUATORIAL REGIONS Equivalent evening minimum FARADAY EFFECT Faraday rotation GHANA IONOSPHERE MAGNETIC STORMS PE62101F SCINTILLATION SUNSPOTS Total electron content WUAFGL46430101
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creator	Koster,John R
description	A minimum in the total electron content of the equatorial ionosphere frequently appears shortly after sunset in measurements of Faraday rotation made at Legon, Ghana (latitude 5.63 deg N, longitude -0.19 deg E, magnetic dip 8 deg S). This paper describes the phenomenon and investigates its occurrence characteristics over a period of six years. It concludes that the effect is due to a transport phenomenon described as a 'circulation cell' which follows the sunset line. This circulation is not considered to be the primary cause of the production of irregularities in the night time F region, but the mechanism is thought to contribute both to the intensity and the duration of the resulting scintillation. (Author)
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This paper describes the phenomenon and investigates its occurrence characteristics over a period of six years. It concludes that the effect is due to a transport phenomenon described as a 'circulation cell' which follows the sunset line. This circulation is not considered to be the primary cause of the production of irregularities in the night time F region, but the mechanism is thought to contribute both to the intensity and the duration of the resulting scintillation. (Author)</description><language>eng</language><subject>Atmospheric Physics ; Circulation cell ; ELECTRON DENSITY ; EQUATORIAL REGIONS ; Equivalent evening minimum ; FARADAY EFFECT ; Faraday rotation ; GHANA ; IONOSPHERE ; MAGNETIC STORMS ; PE62101F ; SCINTILLATION ; SUNSPOTS ; Total electron content ; WUAFGL46430101</subject><creationdate>1977</creationdate><rights>APPROVED FOR PUBLIC RELEASE</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,777,882,27548,27549</link.rule.ids><linktorsrc>$$Uhttps://apps.dtic.mil/sti/citations/ADA050647$$EView_record_in_DTIC$$FView_record_in_$$GDTIC$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>Koster,John R</creatorcontrib><creatorcontrib>GHANA UNIV LEGON DEPT OF PHYSICS</creatorcontrib><title>Study of the Equatorial Ionosphere: The Equatorial Evening Minimum in the Total Electron Content of the Ionosphere and Its Role in Equatorial Scintillation</title><description>A minimum in the total electron content of the equatorial ionosphere frequently appears shortly after sunset in measurements of Faraday rotation made at Legon, Ghana (latitude 5.63 deg N, longitude -0.19 deg E, magnetic dip 8 deg S). This paper describes the phenomenon and investigates its occurrence characteristics over a period of six years. It concludes that the effect is due to a transport phenomenon described as a 'circulation cell' which follows the sunset line. This circulation is not considered to be the primary cause of the production of irregularities in the night time F region, but the mechanism is thought to contribute both to the intensity and the duration of the resulting scintillation. (Author)</description><subject>Atmospheric Physics</subject><subject>Circulation cell</subject><subject>ELECTRON DENSITY</subject><subject>EQUATORIAL REGIONS</subject><subject>Equivalent evening minimum</subject><subject>FARADAY EFFECT</subject><subject>Faraday rotation</subject><subject>GHANA</subject><subject>IONOSPHERE</subject><subject>MAGNETIC STORMS</subject><subject>PE62101F</subject><subject>SCINTILLATION</subject><subject>SUNSPOTS</subject><subject>Total electron content</subject><subject>WUAFGL46430101</subject><fulltext>true</fulltext><rsrctype>report</rsrctype><creationdate>1977</creationdate><recordtype>report</recordtype><sourceid>1RU</sourceid><recordid>eNqFjLsKwkAQANNYiPoHFvsDQsAX2IV4Ygobkz4cycYsXHY1txH8Fn9WIopaWU0xzAyDe6pdeQOpQGsEc-msSkvWQSIs_lxjixvIfpW5IhOf4EBMTdcA8TPORHvpsNBWGGJhRdb3-vMDyyUk6uEoDvv4a50WxErOWSXhcTCorPM4eXEUTHcmi_ezUqnIvRKj5tE2CpfharGe_9EPfBhPiw</recordid><startdate>19771130</startdate><enddate>19771130</enddate><creator>Koster,John R</creator><scope>1RU</scope><scope>BHM</scope></search><sort><creationdate>19771130</creationdate><title>Study of the Equatorial Ionosphere: The Equatorial Evening Minimum in the Total Electron Content of the Ionosphere and Its Role in Equatorial Scintillation</title><author>Koster,John R</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-dtic_stinet_ADA0506473</frbrgroupid><rsrctype>reports</rsrctype><prefilter>reports</prefilter><language>eng</language><creationdate>1977</creationdate><topic>Atmospheric Physics</topic><topic>Circulation cell</topic><topic>ELECTRON DENSITY</topic><topic>EQUATORIAL REGIONS</topic><topic>Equivalent evening minimum</topic><topic>FARADAY EFFECT</topic><topic>Faraday rotation</topic><topic>GHANA</topic><topic>IONOSPHERE</topic><topic>MAGNETIC STORMS</topic><topic>PE62101F</topic><topic>SCINTILLATION</topic><topic>SUNSPOTS</topic><topic>Total electron content</topic><topic>WUAFGL46430101</topic><toplevel>online_resources</toplevel><creatorcontrib>Koster,John R</creatorcontrib><creatorcontrib>GHANA UNIV LEGON DEPT OF PHYSICS</creatorcontrib><collection>DTIC Technical Reports</collection><collection>DTIC STINET</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Koster,John R</au><aucorp>GHANA UNIV LEGON DEPT OF PHYSICS</aucorp><format>book</format><genre>unknown</genre><ristype>RPRT</ristype><btitle>Study of the Equatorial Ionosphere: The Equatorial Evening Minimum in the Total Electron Content of the Ionosphere and Its Role in Equatorial Scintillation</btitle><date>1977-11-30</date><risdate>1977</risdate><abstract>A minimum in the total electron content of the equatorial ionosphere frequently appears shortly after sunset in measurements of Faraday rotation made at Legon, Ghana (latitude 5.63 deg N, longitude -0.19 deg E, magnetic dip 8 deg S). This paper describes the phenomenon and investigates its occurrence characteristics over a period of six years. It concludes that the effect is due to a transport phenomenon described as a 'circulation cell' which follows the sunset line. This circulation is not considered to be the primary cause of the production of irregularities in the night time F region, but the mechanism is thought to contribute both to the intensity and the duration of the resulting scintillation. (Author)</abstract><oa>free_for_read</oa></addata></record>
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subjects	Atmospheric Physics Circulation cell ELECTRON DENSITY EQUATORIAL REGIONS Equivalent evening minimum FARADAY EFFECT Faraday rotation GHANA IONOSPHERE MAGNETIC STORMS PE62101F SCINTILLATION SUNSPOTS Total electron content WUAFGL46430101
title	Study of the Equatorial Ionosphere: The Equatorial Evening Minimum in the Total Electron Content of the Ionosphere and Its Role in Equatorial Scintillation
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