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Volumn 283, Issue 5400, 1999, Pages 353-357

Far-ultraviolet imaging spectroscopy of Io's atmosphere with HST/STIS

Author keywords

[No Author keywords available]

Indexed keywords

OXYGEN; SULFUR;

EID: 0033555851     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.283.5400.353     Document Type: Article
Times cited : (94)

References (50)
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    • G. K. Fox et al., Astronom. J. 113, 1158 (1997); B. R. Sandel and A. L. Broadfoot, J. Geophys. Res. 87, 212 (1982); J. R. Spencer and N. M. Schneider, Annu. Rev. Earth Planet. Sci. 24, 125 (1996).
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    • In time-tag mode, each photon's arrival time and position in the STIS multi-anode microchannel array (MAMA) are recorded individually
    • In time-tag mode, each photon's arrival time and position in the STIS multi-anode microchannel array (MAMA) are recorded individually.
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    • The slit was effectively reduced to 30 arc sec by 2 arc sec (September) and 25 arc sec by 2 arc sec (October) by the finite size of the MAMA detectors
    • The slit was effectively reduced to 30 arc sec by 2 arc sec (September) and 25 arc sec by 2 arc sec (October) by the finite size of the MAMA detectors.
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    • note
    • 2 window (9). Consequently, our G230M data (orbits 1 and 2) are noisy, and only the brightest features can be distinguished; these data are largely excluded from this paper.
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    • It is unclear whether the near-lo emission at ∼1250 Å is predominately S I λ 1251 or S II λ 1256
    • It is unclear whether the near-lo emission at ∼1250 Å is predominately S I λ 1251 or S II λ 1256.
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    • A ∼ 300 km/s), with no bowshock forming and standing magnetohydrodynamic Alfvén waves in lo's rest frame. The corotational electric field of 0.114 V/m produces a ∼400-kV voltage drop across lo, driving a current of a few million amperes through lo's ionosphere; Alfvén waves carry the current along the essentially equipotential magnetic field lines into lo's inner hemisphere and away from its outer hemisphere. (Electrons, the likely current carriers, would of course flow in the opposite direction.) The current loop can be completed in Jupiter's ionosphere only if the round trip travel time for an Alfvén wave is short compared with the time it takes for torus plasma to sweep past lo; otherwise, the current loop is closed in the plasma torus (45).
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    • Jupiter's magnetic equator is tilted 9.6° with respect to its spin equator and lo's orbital plane. Jupiter's centrifugal equator - the locus of points that, of all points on a magnetic field line, are the farthest from Jupiter's spin axis - lies between the magnetic and spin equators. The lo plasma torus is densest at, and approximately symmetric about, the centrifugal equator.
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    • The terrestrial glow still contributed significant photon noise to our data, especially because we made these observations 2 months after opposition, and a fraction of the Earth's exosphere along our line of sight was therefore sunlit. This effect was most pronounced at the beginning of each orbit.
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    • note
    • No correction has been made for the fact that lo blocks part of the H I Lyman-α emission from the interplanetary medium; all lo H I Lyman-α intensities given in this research article could therefore be 200 to 900 Rayleighs too low. Fluxes given in row 2 of Table 3 are not subject to this correction.
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    • note
    • We thank D. Hall for valuable assistance in planning this experiment, and J. Cortiss and M. Freed for long hours spent in data reduction. We also gratefully acknowledge the cooperation and assistance of our co-workers on the STIS Instrument Development Team, and the many people at the Space Telescope Science Institute whose work made these observations possible. We thank anonymous reviewers for valuable comments on the manuscript. A portion of D.F.S.'s research was accomplished at the Observatoire de Paris-Meudon; he thanks Département de Recherche Spatiale for its hospitality. This work was supported by NASA grants NAGW-3319, NAG-4168, and NAGW-6546, and NASA contracts NAS5-30131 and NAS5-30403.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.