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  • stability of ion-acoustic waves in a pair-ion plasma with a third species of ions: application to cometary plasmas

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 906
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    • شماره تماس دبیرخانه رویداد: -
     a popular model of a cometary plasma is hydrogen (h+) with positively charged oxygen (o+) as a heavier ion component. however, the discovery of negatively charged oxygen (o−) ions enables one to model a cometary plasma as a pair-ion plasma (of o+ and o−) with hydrogen as a third ion constituent.
    we have, therefore, studied the stability of the ion-acoustic wave in such a pair-ion plasma with hydrogen and electrons streaming with velocities vdh+ and v de , respectively, relative to the oxygen ions. we find the calculated frequency of the ion-acoustic wave with this model to be in good agreement with the observed frequencies. the ion-acoustic wave can also be driven unstable by the streaming velocity of the hydrogen ions. the growth rate increases with increasing hydrogen density nh+ , and streaming velocities vdh+ and v de . it, however, decreases with increasing oxygen ion densities no+ and no− 

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