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On the anti-correlation between H3+ temperature and density in giant planet ionospheres

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On the anti-correlation between H3+ temperature and density in giant planet ionospheres. / Melin, Henrik; Stallard, Tom; O'Donoghue, James; Badman, Sarah V.; Miller, Steve; Blake, James.

In: Monthly Notices of the Royal Astronomical Society, Vol. 438, No. 2, 21.02.2014, p. 1611-1617.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Melin, H, Stallard, T, O'Donoghue, J, Badman, SV, Miller, S & Blake, J 2014, 'On the anti-correlation between H3+ temperature and density in giant planet ionospheres', Monthly Notices of the Royal Astronomical Society, vol. 438, no. 2, pp. 1611-1617. https://doi.org/10.1093/mnras/stt2299

APA

Melin, H., Stallard, T., O'Donoghue, J., Badman, S. V., Miller, S., & Blake, J. (2014). On the anti-correlation between H3+ temperature and density in giant planet ionospheres. Monthly Notices of the Royal Astronomical Society, 438(2), 1611-1617. https://doi.org/10.1093/mnras/stt2299

Vancouver

Melin H, Stallard T, O'Donoghue J, Badman SV, Miller S, Blake J. On the anti-correlation between H3+ temperature and density in giant planet ionospheres. Monthly Notices of the Royal Astronomical Society. 2014 Feb 21;438(2):1611-1617. https://doi.org/10.1093/mnras/stt2299

Author

Melin, Henrik ; Stallard, Tom ; O'Donoghue, James ; Badman, Sarah V. ; Miller, Steve ; Blake, James. / On the anti-correlation between H3+ temperature and density in giant planet ionospheres. In: Monthly Notices of the Royal Astronomical Society. 2014 ; Vol. 438, No. 2. pp. 1611-1617.

Bibtex

@article{f65488d9b0aa4e08a1a6b35eb1757cfd,
title = "On the anti-correlation between H3+ temperature and density in giant planet ionospheres",
abstract = "The intensity of H3+ emission can be driven by both temperature and density, and when fitting a set of infrared H3+ line spectra, an anticorrelation between the fitted temperatures and densities is commonly observed. The ambiguity present in the existing published literature on how to treat this effect puts into question the physical significance of the derived parameters. Here, we examine the nature of this anticorrelation and quantify the inherent uncertainty in the fitted temperature and density that this produces. We find that the uncertainty produced by the H3+ temperature and density anticorrelation is to a very good approximation equal to the uncertainties that are derived from the fitting procedure invoking Cramer's rule. This means that any previously observed correlated variability in the observed H3+ temperature and density outside these errors, in the absence of other error sources, are statistically separated and can be considered physical. These results are compared to recent ground-based infrared Keck Near InfRared echelle SPECtrograph (NIRSPEC) observations of H3+ emission from Saturn's aurora, which show no clear evidence for large-scale radiative cooling, but do show stark hemispheric differences in temperature.",
keywords = "planets and satellites: atmospheres , planets and satellites: aurorae , planets and satellites: gaseous planets , planets and satellites: magnetic fields",
author = "Henrik Melin and Tom Stallard and James O'Donoghue and Badman, {Sarah V.} and Steve Miller and James Blake",
year = "2014",
month = feb,
day = "21",
doi = "10.1093/mnras/stt2299",
language = "English",
volume = "438",
pages = "1611--1617",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "OXFORD UNIV PRESS",
number = "2",

}

RIS

TY - JOUR

T1 - On the anti-correlation between H3+ temperature and density in giant planet ionospheres

AU - Melin, Henrik

AU - Stallard, Tom

AU - O'Donoghue, James

AU - Badman, Sarah V.

AU - Miller, Steve

AU - Blake, James

PY - 2014/2/21

Y1 - 2014/2/21

N2 - The intensity of H3+ emission can be driven by both temperature and density, and when fitting a set of infrared H3+ line spectra, an anticorrelation between the fitted temperatures and densities is commonly observed. The ambiguity present in the existing published literature on how to treat this effect puts into question the physical significance of the derived parameters. Here, we examine the nature of this anticorrelation and quantify the inherent uncertainty in the fitted temperature and density that this produces. We find that the uncertainty produced by the H3+ temperature and density anticorrelation is to a very good approximation equal to the uncertainties that are derived from the fitting procedure invoking Cramer's rule. This means that any previously observed correlated variability in the observed H3+ temperature and density outside these errors, in the absence of other error sources, are statistically separated and can be considered physical. These results are compared to recent ground-based infrared Keck Near InfRared echelle SPECtrograph (NIRSPEC) observations of H3+ emission from Saturn's aurora, which show no clear evidence for large-scale radiative cooling, but do show stark hemispheric differences in temperature.

AB - The intensity of H3+ emission can be driven by both temperature and density, and when fitting a set of infrared H3+ line spectra, an anticorrelation between the fitted temperatures and densities is commonly observed. The ambiguity present in the existing published literature on how to treat this effect puts into question the physical significance of the derived parameters. Here, we examine the nature of this anticorrelation and quantify the inherent uncertainty in the fitted temperature and density that this produces. We find that the uncertainty produced by the H3+ temperature and density anticorrelation is to a very good approximation equal to the uncertainties that are derived from the fitting procedure invoking Cramer's rule. This means that any previously observed correlated variability in the observed H3+ temperature and density outside these errors, in the absence of other error sources, are statistically separated and can be considered physical. These results are compared to recent ground-based infrared Keck Near InfRared echelle SPECtrograph (NIRSPEC) observations of H3+ emission from Saturn's aurora, which show no clear evidence for large-scale radiative cooling, but do show stark hemispheric differences in temperature.

KW - planets and satellites: atmospheres

KW - planets and satellites: aurorae

KW - planets and satellites: gaseous planets

KW - planets and satellites: magnetic fields

U2 - 10.1093/mnras/stt2299

DO - 10.1093/mnras/stt2299

M3 - Journal article

VL - 438

SP - 1611

EP - 1617

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 2

ER -