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Träfflista för sökning "WFRF:(Gunell Herbert) srt2:(2005-2009)"

Sökning: WFRF:(Gunell Herbert) > (2005-2009)

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1.
  • Ekenbäck, Andreas, et al. (författare)
  • Energetic neutral atom imaging of comets
  • 2008
  • Ingår i: Geophysical Research Letters. - 0094-8276 .- 1944-8007. ; 35:L05103
  • Tidskriftsartikel (refereegranskat)abstract
    • We present the first computer simulated images of energetic neutral atoms (ENAs) produced by charge exchange between solar wind protons and cometary neutrals. Proton bulk flow and temperature from MHD simulations are used along with a model of cometary neutral densities. The emission of hydrogen ENAs from the comet is then calculated using cross sections for the charge exchange collisions. The ENA production rate is integrated along lines of sight to produce an image of the fluxes. We find detection of hydrogen ENAs feasible and most favorable at solar zenith angles between 80 and 130 degrees.
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2.
  • Gunell, Herbert, et al. (författare)
  • Plasma instabilities near Mars
  • 2006
  • Ingår i: Ikke angivet. - : Committee on Space Research. ; , s. 2338-
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • It has been suggested in the literature that the Kelvin-Helmholtz instability can be responsible for significant ion loss at Mars through the detachment of ionospheric plasma clouds Clouds of detached ionospheric plasma were observed at Venus by the Pioneer Venus orbiter The conditions at Mars differ somewhat from those at Venus The ratio between the ion gyro radius and the radius of the planet is larger at Mars than at Venus since Mars is a smaller planet and the solar wind magnetic field is weaker at Mars than at Venus It is therefore interesting to study instabilities at Mars and to compare the results from Mars with those from Venus We search the ion and electron data from the ASPERA-3 instrument on the Mars Express spacecraft for signatures of instabilities at Mars We present data indicative of instabilities in the magnetosheath and the induced magnetosphere boundary downstream of the planet
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