He 584 Å dayglow at Neptune

Christopher D. Parkinson, John C. McConnell, Bill R. Sandel, Roger Yelle, A. Lyle Broadfoot

Research output: Contribution to journalArticle

6 Citations (Scopus)

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).

Original languageEnglish (US)
Pages (from-to)1709-1712
Number of pages4
JournalGeophysical Research Letters
Volume17
Issue number10
DOIs
StatePublished - 1990

Fingerprint

dayglow
Neptune (planet)
Neptune
spectrometer
infrared interferometers
ultraviolet spectrometers
turbulent diffusion
atmospheric models
mixing ratios
interferometer
resonance lines
mixing ratio
eddy
diffusion coefficient
hydrocarbons
spectrometers
hydrocarbon
products

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Parkinson, C. D., McConnell, J. C., Sandel, B. R., Yelle, R., & Broadfoot, A. L. (1990). He 584 Å dayglow at Neptune. Geophysical Research Letters, 17(10), 1709-1712. https://doi.org/10.1029/GL017i010p01709

He 584 Å dayglow at Neptune. / Parkinson, Christopher D.; McConnell, John C.; Sandel, Bill R.; Yelle, Roger; Broadfoot, A. Lyle.

In: Geophysical Research Letters, Vol. 17, No. 10, 1990, p. 1709-1712.

Research output: Contribution to journalArticle

Parkinson, CD, McConnell, JC, Sandel, BR, Yelle, R & Broadfoot, AL 1990, 'He 584 Å dayglow at Neptune', Geophysical Research Letters, vol. 17, no. 10, pp. 1709-1712. https://doi.org/10.1029/GL017i010p01709
Parkinson CD, McConnell JC, Sandel BR, Yelle R, Broadfoot AL. He 584 Å dayglow at Neptune. Geophysical Research Letters. 1990;17(10):1709-1712. https://doi.org/10.1029/GL017i010p01709
Parkinson, Christopher D. ; McConnell, John C. ; Sandel, Bill R. ; Yelle, Roger ; Broadfoot, A. Lyle. / He 584 Å dayglow at Neptune. In: Geophysical Research Letters. 1990 ; Vol. 17, No. 10. pp. 1709-1712.
@article{53f5764e8d1148f7aa6c4503f2f78568,
title = "He 584 {\AA} dayglow at Neptune",
abstract = "The Voyager 2 Ultraviolet Spectrometer measured the emission intensity of the He resonance line at 584 {\AA} to be 0.34‐0.15+0.2 R on the day side of Neptune. Our calculations of the He 584 {\AA} 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).",
author = "Parkinson, {Christopher D.} and McConnell, {John C.} and Sandel, {Bill R.} and Roger Yelle and Broadfoot, {A. Lyle}",
year = "1990",
doi = "10.1029/GL017i010p01709",
language = "English (US)",
volume = "17",
pages = "1709--1712",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "10",

}

TY - JOUR

T1 - He 584 Å dayglow at Neptune

AU - Parkinson, Christopher D.

AU - McConnell, John C.

AU - Sandel, Bill R.

AU - Yelle, Roger

AU - Broadfoot, A. Lyle

PY - 1990

Y1 - 1990

N2 - 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).

AB - 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).

UR - http://www.scopus.com/inward/record.url?scp=11544286747&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=11544286747&partnerID=8YFLogxK

U2 - 10.1029/GL017i010p01709

DO - 10.1029/GL017i010p01709

M3 - Article

AN - SCOPUS:11544286747

VL - 17

SP - 1709

EP - 1712

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 10

ER -