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  • Wiley  (2)
  • 2010-2014  (2)
  • 1
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    The immersion mode ice nucleation behavior of mineral dusts: A comparison of different pure and surface modified dusts (2014)
    Wiley
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    Publication Date: 2014-09-27
    Description: In this study we present results from immersion freezing experiments with size segregated mineral dust particles. Besides two already existing data sets for Arizona Test Dust (ATD), and Fluka kaolinite, we show two new data sets for illite-NX, which consists mainly of illite, a clay mineral, and feldspar, a common crustal material. The experiments were carried out with the Leipzig Aerosol Cloud Interaction Simulator (LACIS). After comparing the different dust samples, it became obvious that the freezing ability was positively correlated with the K-feldspar content. Furthermore, a comparison of the composition of the ATD, illite-NX, and feldspar samples suggests that within the K-feldspars, microcline is more ice nucleation active than orthoclase. A coating with sulfuric acid leads to a decrease in the ice nucleation ability of all mineral dusts, with the effect being more pronounced for the feldspar sample.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 2
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    Plasma and Energetic Particle Observations in Jupiter's Deep Tail near the Magnetopause (2014)
    Wiley
    Details
    Publication Date: 2014-08-13
    Description: Jupiter's nightside magnetosphere stretches out into an extensive magnetotail. New Horizons observed continuously over 1AU down Jupiter's tail, far more than any other spacecraft. Previously, Voyager 2 showed signatures of the tail as far as 4AU distance from Jupiter. We combine data from New Horizons’ charged particle instruments: SWAP, measuring plasma ions (21-7800 eV/Q) and PEPSSI, measuring energetic ions and electrons (0.03-1.6 MeV). The magnetosheath it is clearly distinguished from the magnetotail, owing to more plasma ions. They are often separated by a boundary layer with intermediate properties at plasma energies but resemblance to the magnetotail at higher energies. Compared to the tail, the sheath contains on average more energetic protons and helium ions (potential solar wind origin) and fewer energetic electrons, oxygen, and sulfur ions (latter two of magnetospheric origin). The difference between tail and sheath for energetic ions and electrons is less pronounced than for plasma ions, which may result from particle exchange. We have ruled out that this is due to gyroradius. Energetic ion count rate enhancements with velocity dispersion cross between tail, boundary layer, and sheath. This indicates occasional magnetic connections since the enhancements are interpreted as particles following magnetic flux tubes. The deep tail magnetic field is therefore not entirely separated from the solar wind. Brief magnetic connection will mostly allow the fastest particles to cross. Most dispersed enhancements include sulfur ions consistent with an origin near Jupiter's x-line. We found one event of mostly protons, indicating an origin at larger distances.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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