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Träfflista för sökning "L773:0094 8276 srt2:(2010-2014);pers:(Andrews David J.)"

Search: L773:0094 8276 > (2010-2014) > Andrews David J.

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  • Edberg, Niklas J. T., et al. (author)
  • Extreme densities in Titan's ionosphere during the T85 magnetosheath encounter
  • 2013
  • In: Geophysical Research Letters. - : American Geophysical Union (AGU). - 0094-8276 .- 1944-8007. ; 40:12, s. 2879-2883
  • Journal article (peer-reviewed)abstract
    • We present Cassini Langmuir probe measurements of the highest electron number densities ever reported from the ionosphere of Titan. The measured density reached 4310cm(-3) during the T85 Titan flyby. This is at least 500cm(-3) higher than ever observed before and at least 50% above the average density for similar solar zenith angles. The peak of the ionospheric density is not reached on this flyby, making the maximum measured density a lower limit. During this flyby, we also report that an impacting coronal mass ejection (CME) leaves Titan in the magnetosheath of Saturn, where it is exposed to shocked solar wind plasma for at least 2 h 45 min. We suggest that the solar wind plasma in the magnetosheath during the CME conditions significantly modifies Titan's ionosphere by an addition of particle impact ionization by precipitating protons.
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2.
  • Han, X., et al. (author)
  • Discrepancy between ionopause and photoelectron boundary determined from Mars Express measurements
  • 2014
  • In: Geophysical Research Letters. - 0094-8276 .- 1944-8007. ; 41:23, s. 8221-8227
  • Journal article (peer-reviewed)abstract
    • The Martian ionosphere directly interacts with the solar wind due to lack of a significant intrinsic magnetic field, and an interface is formed in between. The interface is usually recognized by two kinds of indicators: the ionopause identified from ionospheric density profiles and the photoelectron boundary (PEB) determined from the electron energy spectrum at higher energies. However, the difference between them remains unclear. We have determined the locations of crossings of the ionopause and PEB from Mars Express observations during 2005-2013 and found that the average position of the PEB appears to be similar to 200km higher than that of the ionopause, which corresponds to 10(3)cm(-3) in the electron density profile. The discrepancy can be explained by cross-field transport of photoelectrons.
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Type of publication
journal article (2)
Type of content
peer-reviewed (2)
Author/Editor
Andrews, David J... (2)Undo refine
Zhong, J. (1)
He, M. (1)
Wei, Y. (1)
Modolo, R (1)
Li, K. (1)
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Han, X (1)
Edberg, Niklas J. T. (1)
Opgenoorth, Hermann ... (1)
Fraenz, M. (1)
Dubinin, E. (1)
Dougherty, M. K. (1)
Barabash, S. (1)
Wahlund, Jan-Erik (1)
Badman, S. V. (1)
Bertucci, C. (1)
Garnier, P. (1)
Cravens, T. E. (1)
Shebanits, Oleg (1)
Ågren, K. (1)
Roussos, E. (1)
Wan, W. (1)
Rong, Z. J. (1)
Chai, L. (1)
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University
Uppsala University (2)
Language
English (2)
Research subject (UKÄ/SCB)
Natural sciences (1)

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