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Predictions of the electrical conductivity and charging of the cloud particles in Jupiter's atmosphere

Whitten, R. C. and Borucki, W. J. and O'Brien, K. and Tripathi, S. N. (2008) Predictions of the electrical conductivity and charging of the cloud particles in Jupiter's atmosphere. Journal of Geophysical Research-Planets, 113 (E4001). ISSN 0148-0227


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Publisher’s or external URL: http://dx.doi.org/10.1029/2007JE002975


The electrical conductivity and electrical charge on cloud particles ( composed of ammonia, ammonium hydrosulfide, and water) in the atmosphere of Jupiter are computed for pressures between 5.5 and 0.1 bars. The source of ionization is galactic cosmic rays (GCR). The distribution of charge among the various reservoirs is a function of altitude and the total area of the aerosol particles. For pressures below 4 bars, the electrons are scavenged efficiently by the cloud particles, decreasing the electron- ion recombination rate and resulting in increased positive ion abundance over that in the absence of the particles. For the upper regions of each cloud layer, the area of the aerosols and the large diffusion rate of the electrons cause most aerosol particles to be negatively charged. Near the bases of the cloud layers, the larger total area of the aerosols causes most of the charge, positive and negative, to reside on particles. Where clouds are present, the reduction of the electron conductivity ranges from a factor of 30 at 0.1 bar to 10 4 at 4 bars. At pressures near 1 bar and 4 bars, the positive ion conductivity increases by a factor of 10 over that expected for the clear atmosphere. A parametric study of negative ions shows that they are likely to be insignificant. For altitudes below the 0.3- bar level the predicted positive and negative conductivities are well below the detection limit of the relaxation and mutual impedance instruments such as those employed on the Huygens entry probe.

Item Type: Article
Publisher’s Statement: © 2008 by the American Geophysical Union. DOI: 10.1029/2007JE002975
ID number or DOI: 10.1029/2007JE002975
Keywords: Jupiter; Jupiter atmosphere; Huygens probe; cloud particles;
Subjects: Q Science > QB Astronomy
NAU Depositing Author Academic Status: Faculty/Staff
Department/Unit: College of Engineering, Forestry, and Natural Science > Physics and Astronomy
Date Deposited: 18 Oct 2015 20:29
URI: http://openknowledge.nau.edu/id/eprint/926

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