The high-frequency characteristics of solar radio bursts
Identifieur interne : 000830 ( Main/Exploration ); précédent : 000829; suivant : 000831The high-frequency characteristics of solar radio bursts
Auteurs : J. Lim [États-Unis] ; M. White [États-Unis] ; R. Kundu [États-Unis] ; E. Gary [États-Unis]Source :
- Solar Physics [ 0038-0938 ] ; 1992-08-01.
Abstract
Abstract: We compare the millimeter, microwave, and soft X-ray emission from a number of solar flares in order to determine the properties of the high-frequency radio emission of flares. The millimeter observations use a sensitive interferometer at 86 GHz which offers much better sensitivity and spatial resolution than most previous high-frequency observations. We find a number of important results for these flares: (i) the 86 GHz emission onset appears often to be delayed with respect to the microwave onset; (ii) even in large flares the millimeter-wavelength emission can arise in sources of only a few arc sec dimension; (iii) the millimeter emission in the impulsive phase does not correlate with the soft X-ray emission, and thus is unlikely to contain any significant thermal bremsstrahlung component; and (iv) the electron energy distributions implied by the millimeter observations are much flatter (spectral indices of 2.5 to 3.6) than is usual for microwave or hard X-ray observations.
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DOI: 10.1007/BF00146317
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Gary</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:B85655E546C62E5FCDC754386428811D4377A866</idno><date when="1992" year="1992">1992</date><idno type="doi">10.1007/BF00146317</idno><idno type="url">https://api.istex.fr/document/B85655E546C62E5FCDC754386428811D4377A866/fulltext/pdf</idno><idno type="wicri:Area/Main/Corpus">000651</idno><idno type="wicri:Area/Main/Curation">000651</idno><idno type="wicri:Area/Main/Exploration">000830</idno><idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Exploration">000830</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">The high-frequency characteristics of solar radio bursts</title><author><name sortKey="Lim, J" sort="Lim, J" uniqKey="Lim J" first="J." last="Lim">J. Lim</name><affiliation wicri:level="4"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Astronomy, University of Maryland, 20742, College Park, MD</wicri:regionArea><orgName type="university">Université du Maryland</orgName><placeName><settlement type="city">College Park (Maryland)</settlement><region type="state">Maryland</region></placeName></affiliation></author><author><name sortKey="White, M" sort="White, M" uniqKey="White M" first="M." last="White">M. White</name><affiliation wicri:level="4"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Astronomy, University of Maryland, 20742, College Park, MD</wicri:regionArea><orgName type="university">Université du Maryland</orgName><placeName><settlement type="city">College Park (Maryland)</settlement><region type="state">Maryland</region></placeName></affiliation></author><author><name sortKey="Kundu, R" sort="Kundu, R" uniqKey="Kundu R" first="R." last="Kundu">R. Kundu</name><affiliation wicri:level="4"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Astronomy, University of Maryland, 20742, College Park, MD</wicri:regionArea><orgName type="university">Université du Maryland</orgName><placeName><settlement type="city">College Park (Maryland)</settlement><region type="state">Maryland</region></placeName></affiliation></author><author><name sortKey="Gary, E" sort="Gary, E" uniqKey="Gary E" first="E." last="Gary">E. Gary</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Solar Astronomy, 264-33 Caltech, 9110, Pasadena, CA</wicri:regionArea><wicri:noRegion>CA</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Solar Physics</title><title level="j" type="sub">A Journal for Solar and Solar-Stellar Research and the Study of Solar Terrestrial Physics</title><title level="j" type="abbrev">Sol Phys</title><idno type="ISSN">0038-0938</idno><idno type="eISSN">1573-093X</idno><imprint><publisher>Kluwer Academic Publishers</publisher><pubPlace>Dordrecht</pubPlace><date type="published" when="1992-08-01">1992-08-01</date><biblScope unit="volume">140</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="343">343</biblScope><biblScope unit="page" to="368">368</biblScope></imprint><idno type="ISSN">0038-0938</idno></series><idno type="istex">B85655E546C62E5FCDC754386428811D4377A866</idno><idno type="DOI">10.1007/BF00146317</idno><idno type="ArticleID">BF00146317</idno><idno type="ArticleID">Art8</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0038-0938</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: We compare the millimeter, microwave, and soft X-ray emission from a number of solar flares in order to determine the properties of the high-frequency radio emission of flares. The millimeter observations use a sensitive interferometer at 86 GHz which offers much better sensitivity and spatial resolution than most previous high-frequency observations. We find a number of important results for these flares: (i) the 86 GHz emission onset appears often to be delayed with respect to the microwave onset; (ii) even in large flares the millimeter-wavelength emission can arise in sources of only a few arc sec dimension; (iii) the millimeter emission in the impulsive phase does not correlate with the soft X-ray emission, and thus is unlikely to contain any significant thermal bremsstrahlung component; and (iv) the electron energy distributions implied by the millimeter observations are much flatter (spectral indices of 2.5 to 3.6) than is usual for microwave or hard X-ray observations.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Maryland</li></region><settlement><li>College Park (Maryland)</li></settlement><orgName><li>Université du Maryland</li></orgName></list><tree><country name="États-Unis"><region name="Maryland"><name sortKey="Lim, J" sort="Lim, J" uniqKey="Lim J" first="J." last="Lim">J. Lim</name></region><name sortKey="Gary, E" sort="Gary, E" uniqKey="Gary E" first="E." last="Gary">E. Gary</name><name sortKey="Kundu, R" sort="Kundu, R" uniqKey="Kundu R" first="R." last="Kundu">R. Kundu</name><name sortKey="White, M" sort="White, M" uniqKey="White M" first="M." last="White">M. White</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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