High resolution OI (630 nm) image measurements of F‐region depletion drifts during the Guará Campaign
Identifieur interne : 002640 ( Main/Merge ); précédent : 002639; suivant : 002641High resolution OI (630 nm) image measurements of F‐region depletion drifts during the Guará Campaign
Auteurs : M. J. Taylor [États-Unis] ; J. V. Eccles [États-Unis] ; J. Labelle [États-Unis] ; J. H. A. Sobral [Brésil]Source :
- Geophysical Research Letters [ 0094-8276 ] ; 1997-07-01.
Abstract
A high performance, all‐sky, imaging system has provided data on the evolution and drift motions of F‐region depletions above the magnetic dip equator at Alcântara, Brazil, (2.3°S, 44.5°W). Monochromatic images of depletions in the OI(630 nm) nightglow were recorded on eight nights during 1‐16 October, 1994, as part of the Guará campaign. The drift motions of the depletions were typically 80–100 m/s eastward prior to local midnight and reduced to a minimum of ∼30–50 m/s in the morning hours, in accord with previous observations. However, on October 2–3 and 12–13 the depletions were observed to reverse direction for ∼60–90 min, achieving westward speeds of ∼30 m/s before the motion reverted to eastward around 0100 LT and accelerated to 35–45 m/s near dawn. Magnetic activity and other evidence suggests that these reversals in the motion of the airglow depletions probably result from reversals in the F‐region dynamo rather than from shifts in the altitude of the shear in the nighttime F‐region plasma drift.
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DOI: 10.1029/97GL01207
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">High resolution OI (630 nm) image measurements of F‐region depletion drifts during the Guará Campaign</title><author><name sortKey="Taylor, M J" sort="Taylor, M J" uniqKey="Taylor M" first="M. J." last="Taylor">M. J. Taylor</name></author><author><name sortKey="Eccles, J V" sort="Eccles, J V" uniqKey="Eccles J" first="J. V." last="Eccles">J. V. Eccles</name></author><author><name sortKey="Labelle, J" sort="Labelle, J" uniqKey="Labelle J" first="J." last="Labelle">J. Labelle</name></author><author><name sortKey="Sobral, J H A" sort="Sobral, J H A" uniqKey="Sobral J" first="J. H. A." last="Sobral">J. H. A. Sobral</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:FDBA4ED3FFF5890BE2CCE81A5CBCF485B21871E3</idno><date when="1997" year="1997">1997</date><idno type="doi">10.1029/97GL01207</idno><idno type="url">https://api.istex.fr/document/FDBA4ED3FFF5890BE2CCE81A5CBCF485B21871E3/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">002F76</idno><idno type="wicri:Area/Istex/Curation">002D43</idno><idno type="wicri:Area/Istex/Checkpoint">001961</idno><idno type="wicri:doubleKey">0094-8276:1997:Taylor M:high:resolution:oi</idno><idno type="wicri:Area/Main/Merge">002640</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">High resolution OI (630 nm) image measurements of F‐region depletion drifts during the Guará Campaign</title><author><name sortKey="Taylor, M J" sort="Taylor, M J" uniqKey="Taylor M" first="M. J." last="Taylor">M. J. Taylor</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><placeName><region type="state">Utah</region></placeName><wicri:cityArea>Space Dynamics Laboratory and Physics Department, Utah State University, Logan</wicri:cityArea></affiliation></author><author><name sortKey="Eccles, J V" sort="Eccles, J V" uniqKey="Eccles J" first="J. V." last="Eccles">J. V. Eccles</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><placeName><region type="state">Utah</region></placeName><wicri:cityArea>Space Environment Corporation, Logan</wicri:cityArea></affiliation></author><author><name sortKey="Labelle, J" sort="Labelle, J" uniqKey="Labelle J" first="J." last="Labelle">J. Labelle</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><placeName><region type="state">New Hampshire</region></placeName><wicri:cityArea>Department of Physics and Astronomy, Dartmouth College, Hanover</wicri:cityArea></affiliation></author><author><name sortKey="Sobral, J H A" sort="Sobral, J H A" uniqKey="Sobral J" first="J. H. A." last="Sobral">J. H. A. Sobral</name><affiliation wicri:level="1"><country xml:lang="fr">Brésil</country><wicri:regionArea>Instituto Nacional de Pesquisas Espaciais, São José dos Campos</wicri:regionArea><wicri:noRegion>São José dos Campos</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Geophysical Research Letters</title><title level="j" type="abbrev">Geophys. Res. Lett.</title><idno type="ISSN">0094-8276</idno><idno type="eISSN">1944-8007</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="1997-07-01">1997-07-01</date><biblScope unit="volume">24</biblScope><biblScope unit="issue">13</biblScope><biblScope unit="page" from="1699">1699</biblScope><biblScope unit="page" to="1702">1702</biblScope></imprint><idno type="ISSN">0094-8276</idno></series><idno type="istex">FDBA4ED3FFF5890BE2CCE81A5CBCF485B21871E3</idno><idno type="DOI">10.1029/97GL01207</idno><idno type="ArticleID">97GL01207</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0094-8276</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">A high performance, all‐sky, imaging system has provided data on the evolution and drift motions of F‐region depletions above the magnetic dip equator at Alcântara, Brazil, (2.3°S, 44.5°W). Monochromatic images of depletions in the OI(630 nm) nightglow were recorded on eight nights during 1‐16 October, 1994, as part of the Guará campaign. The drift motions of the depletions were typically 80–100 m/s eastward prior to local midnight and reduced to a minimum of ∼30–50 m/s in the morning hours, in accord with previous observations. However, on October 2–3 and 12–13 the depletions were observed to reverse direction for ∼60–90 min, achieving westward speeds of ∼30 m/s before the motion reverted to eastward around 0100 LT and accelerated to 35–45 m/s near dawn. Magnetic activity and other evidence suggests that these reversals in the motion of the airglow depletions probably result from reversals in the F‐region dynamo rather than from shifts in the altitude of the shear in the nighttime F‐region plasma drift.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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