He 584 Å dayglow at Neptune
Identifieur interne : 004945 ( Main/Exploration ); précédent : 004944; suivant : 004946He 584 Å dayglow at Neptune
Auteurs : Christopher D. Parkinson [Canada] ; John C. Mcconnell [Canada] ; Bill R. Sandel [États-Unis] ; Roger V. Yelle [États-Unis] ; A. Lyle Broadfoot [États-Unis]Source :
- Geophysical Research Letters [ 0094-8276 ] ; 1990-09.
Abstract
The Voyager 2 Ultraviolet Spectrometer measured the emission intensity of the He resonance line at 584 Å to be 0.34‐0.15+0.2 R on the day side of Neptune. Our calculations of the He 584 Å intensity at Neptune using partial frequency redistribution and inhomogeneous atmospheric models show that the product of the volume mixing ratio (mole fraction), fHe, and the eddy diffusion coefficient at the homopause, Kh, is fHeKh = 107 cm2 s−1 with upper and lower bounds to the uncertainty of about a factor of 3 and 9, respectively. If fHe is taken as the current Infrared Interferometer Spectrometer working value, fHe = 0.19, then Kh = 5×107 cm2 s−1 with a similar uncertainty. This range of K overlaps that obtained from analysis of the hydrocarbon distributions on Neptune (Broadfoot et al., 1989).
Url:
DOI: 10.1029/GL017i010p01709
Affiliations:
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Parkinson</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Centre for Research in Earth and Space Science, York University</wicri:regionArea><wicri:noRegion>York University</wicri:noRegion></affiliation></author><author><name sortKey="Mcconnell, John C" sort="Mcconnell, John C" uniqKey="Mcconnell J" first="John C." last="Mcconnell">John C. Mcconnell</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Earth and Atmospheric Science, York University</wicri:regionArea><wicri:noRegion>York University</wicri:noRegion></affiliation></author><author><name sortKey="Sandel, Bill R" sort="Sandel, Bill R" uniqKey="Sandel B" first="Bill R." last="Sandel">Bill R. 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Lett.</title><idno type="ISSN">0094-8276</idno><idno type="eISSN">1944-8007</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="1990-09">1990-09</date><biblScope unit="volume">17</biblScope><biblScope unit="issue">10</biblScope><biblScope unit="page" from="1709">1709</biblScope><biblScope unit="page" to="1712">1712</biblScope></imprint><idno type="ISSN">0094-8276</idno></series><idno type="istex">FF07F97644394A8F4EEC227595EE784B6B40C564</idno><idno type="DOI">10.1029/GL017i010p01709</idno><idno type="ArticleID">90GL01261</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">The Voyager 2 Ultraviolet Spectrometer measured the emission intensity of the He resonance line at 584 Å to be 0.34‐0.15+0.2 R on the day side of Neptune. Our calculations of the He 584 Å intensity at Neptune using partial frequency redistribution and inhomogeneous atmospheric models show that the product of the volume mixing ratio (mole fraction), fHe, and the eddy diffusion coefficient at the homopause, Kh, is fHeKh = 107 cm2 s−1 with upper and lower bounds to the uncertainty of about a factor of 3 and 9, respectively. If fHe is taken as the current Infrared Interferometer Spectrometer working value, fHe = 0.19, then Kh = 5×107 cm2 s−1 with a similar uncertainty. This range of K overlaps that obtained from analysis of the hydrocarbon distributions on Neptune (Broadfoot et al., 1989).</div></front></TEI><affiliations><list><country><li>Canada</li><li>États-Unis</li></country><region><li>Arizona</li></region></list><tree><country name="Canada"><noRegion><name sortKey="Parkinson, Christopher D" sort="Parkinson, Christopher D" uniqKey="Parkinson C" first="Christopher D." last="Parkinson">Christopher D. Parkinson</name></noRegion><name sortKey="Mcconnell, John C" sort="Mcconnell, John C" uniqKey="Mcconnell J" first="John C." last="Mcconnell">John C. Mcconnell</name></country><country name="États-Unis"><region name="Arizona"><name sortKey="Sandel, Bill R" sort="Sandel, Bill R" uniqKey="Sandel B" first="Bill R." last="Sandel">Bill R. Sandel</name></region><name sortKey="Broadfoot, A Lyle" sort="Broadfoot, A Lyle" uniqKey="Broadfoot A" first="A. Lyle" last="Broadfoot">A. Lyle Broadfoot</name><name sortKey="Yelle, Roger V" sort="Yelle, Roger V" uniqKey="Yelle R" first="Roger V." last="Yelle">Roger V. Yelle</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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