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  • 1
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    Ion-cyclotron wave heating of heavy ions in the equatorial magnetosphere - A numerical simulation theory (1988)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A 1-2/2 dimensional hybrid numerical simulation code is used to study the heating of cold H(+) ions and heavy ions by electromagnetic ion-cyclotron waves (ICWs) in the ring current region of the equatorial magnetosphere. Consideration is given to a plasma consisting of electrons, hot H(+) ions, and cold heavy ions in which the ICWs are driven by the temperature anisotropy of the hot protons. For large-amplitude ICWs, it is found that the cold H(+) ions are preferentially heated over the heavy ions although the cold H(+) ions are heated by a three-step process.
    Keywords: GEOPHYSICS
    Type: Huntsville Workshop on Magnetosphere/Ionosphere Plasma Models; Oct 14, 1987 - Oct 16, 1987; Guntersville, AL; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Plasma characteristics of upflowing ion beams in the polar cap region (1990)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The plasma characteristics of upflowing ion stream events with energies greater than 10 eV in the polar cap region near solar maximum are analyzed. It is found that, in 22 of the 41 polar ion streaming events studied, O(+) is the dominant ion constituent in the upflowing beam components. There are significant amounts of upflowing O(+) in the plasma even during quiet auroral conditions. In one event, the upflowing O(+) population had two components, a cold distribution and a warm one. In another event the O(+) and H(+) temperatures suggested that ionospheric ions are heated. The cold upflowing ion stream component observed in some of the polar ion streaming events exhibited a filamentary nature. A significant amount of He(+) was also found in some of the events studied.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 95; 3907-392
    Format: text
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    NASA TECHNICAL REPORTS
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