IMF dependence of the open-closed field line boundary in Saturn's ionosphere, and its relation to the UV auroral oval observed by the Hubble Space Telescope

Physics

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angeo-25-1215-2007
Rights statement: © European Geosciences Union 2007
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https://doi.org/10.5194/angeo-25-1215-2007
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Magnetospheric physics

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IMF dependence of the open-closed field line boundary in Saturn's ionosphere, and its relation to the UV auroral oval observed by the Hubble Space Telescope. / Belenkaya, E. S.; Alexeev, I. I.; Blokhina, M. S. et al.
In: Annales Geophysicae, Vol. 25, No. 5, 04.06.2007, p. 1215-1226.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Bibtex

@article{343ca41cf5b941a4a54987d95ddedbe9,

title = "IMF dependence of the open-closed field line boundary in Saturn's ionosphere, and its relation to the UV auroral oval observed by the Hubble Space Telescope",

abstract = " We study the dependence of Saturn's magnetospheric magnetic field structure on the interplanetary magnetic field (IMF), together with the corresponding variations of the open-closed field line boundary in the ionosphere. Specifically we investigate the interval from 8 to 30 January 2004, when UV images of Saturn's southern aurora were obtained by the Hubble Space Telescope (HST), and simultaneous interplanetary measurements were provided by the Cassini spacecraft located near the ecliptic ~0.2 AU upstream of Saturn and ~0.5 AU off the planet-Sun line towards dawn. Using the paraboloid model of Saturn's magnetosphere, we calculate the magnetospheric magnetic field structure for several values of the IMF vector representative of interplanetary compression regions. Variations in the magnetic structure lead to different shapes and areas of the open field line region in the ionosphere. Comparison with the HST auroral images shows that the area of the computed open flux region is generally comparable to that enclosed by the auroral oval, and sometimes agrees in detail with its poleward boundary, though more typically being displaced by a few degrees in the tailward direction.",

keywords = "Magnetospheric physics",

author = "Belenkaya, {E. S.} and Alexeev, {I. I.} and Blokhina, {M. S.} and Cowley, {S. W. H.} and Badman, {S. V.} and Kalegaev, {V. V.} and Grigoryan, {M. S.}",

note = "{\textcopyright} European Geosciences Union 2007",

year = "2007",

month = jun,

day = "4",

doi = "10.5194/angeo-25-1215-2007",

language = "English",

volume = "25",

pages = "1215--1226",

journal = "Annales Geophysicae",

issn = "0992-7689",

publisher = "European Geosciences Union",

number = "5",

}

RIS

TY - JOUR

T1 - IMF dependence of the open-closed field line boundary in Saturn's ionosphere, and its relation to the UV auroral oval observed by the Hubble Space Telescope

AU - Belenkaya, E. S.

AU - Alexeev, I. I.

AU - Blokhina, M. S.

AU - Cowley, S. W. H.

AU - Badman, S. V.

AU - Kalegaev, V. V.

AU - Grigoryan, M. S.

PY - 2007/6/4

Y1 - 2007/6/4

N2 - We study the dependence of Saturn's magnetospheric magnetic field structure on the interplanetary magnetic field (IMF), together with the corresponding variations of the open-closed field line boundary in the ionosphere. Specifically we investigate the interval from 8 to 30 January 2004, when UV images of Saturn's southern aurora were obtained by the Hubble Space Telescope (HST), and simultaneous interplanetary measurements were provided by the Cassini spacecraft located near the ecliptic ~0.2 AU upstream of Saturn and ~0.5 AU off the planet-Sun line towards dawn. Using the paraboloid model of Saturn's magnetosphere, we calculate the magnetospheric magnetic field structure for several values of the IMF vector representative of interplanetary compression regions. Variations in the magnetic structure lead to different shapes and areas of the open field line region in the ionosphere. Comparison with the HST auroral images shows that the area of the computed open flux region is generally comparable to that enclosed by the auroral oval, and sometimes agrees in detail with its poleward boundary, though more typically being displaced by a few degrees in the tailward direction.

AB - We study the dependence of Saturn's magnetospheric magnetic field structure on the interplanetary magnetic field (IMF), together with the corresponding variations of the open-closed field line boundary in the ionosphere. Specifically we investigate the interval from 8 to 30 January 2004, when UV images of Saturn's southern aurora were obtained by the Hubble Space Telescope (HST), and simultaneous interplanetary measurements were provided by the Cassini spacecraft located near the ecliptic ~0.2 AU upstream of Saturn and ~0.5 AU off the planet-Sun line towards dawn. Using the paraboloid model of Saturn's magnetosphere, we calculate the magnetospheric magnetic field structure for several values of the IMF vector representative of interplanetary compression regions. Variations in the magnetic structure lead to different shapes and areas of the open field line region in the ionosphere. Comparison with the HST auroral images shows that the area of the computed open flux region is generally comparable to that enclosed by the auroral oval, and sometimes agrees in detail with its poleward boundary, though more typically being displaced by a few degrees in the tailward direction.

KW - Magnetospheric physics

U2 - 10.5194/angeo-25-1215-2007

DO - 10.5194/angeo-25-1215-2007

M3 - Journal article

VL - 25

SP - 1215

EP - 1226

JO - Annales Geophysicae

JF - Annales Geophysicae

SN - 0992-7689

IS - 5

ER -

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