A model of the SO 2  atmosphere and ionosphere of Io | Zendy

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A model of the SO 2 atmosphere and ionosphere of Io

Author(s) -

Kumar S.

Publication year - 1980

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/gl007i001p00009

Subject(s) - exosphere , atmosphere (unit) , ionosphere , ionization , absorption (acoustics) , electron density , atomic physics , electron , atmospheric sciences , physics , range (aeronautics) , materials science , computational physics , ion , astronomy , optics , meteorology , nuclear physics , quantum mechanics , composite material

The calculations of thermal structure for an SO 2 atmosphere of Io lead to exospheric temperatures in 800‐1200K range. The Pioneer 10 electron density profiles can be fit with an SO 2 surface density of 1.2 × 10 11 cm −3 at 5:30 pm local time and exosphere temperature of 1030°K. Low energy electrons provide the major ionization source but the solar UV absorption dominates the heating of the atmosphere due to the long wavelength absorption threshold of SO 2 and large absorption cross‐sections.

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