Electromagnetic ion-beam-plasma instabilities
It is well known that ion beam-plasma interactions can destabilize right- and left-hand polarized electromagnetic waves. However, these instabilities have been studied for frequencies less than the ion-beam gyrofrequency, with the exception of Goldstein and Wong (1987), and Brinca and Tsurutani (198...
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| Published in: | Planetary and space science Vol. 46; no. 11; pp. 1683 - 1687 |
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| Main Authors: | , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Elsevier Ltd
01-11-1998
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| Online Access: | Get full text |
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| Summary: | It is well known that ion beam-plasma interactions can destabilize right- and left-hand polarized electromagnetic waves. However, these instabilities have been studied for frequencies less than the ion-beam gyrofrequency, with the exception of Goldstein and Wong (1987), and Brinca and Tsurutani (1988), who studied also the region of high frequencies (
ω > Ω
i
, where
Ω
i
is the ion-beam gyrofrequency), in connection with pickup cometary ions. It has been recently demonstrated that in the cold plasma theory, left- and right-hand modes can be destabilized in a rather large range of frequency and wavenumber values. It has also been shown that, in some cases, the unstable spectrum has a band structure. We study here thermal effects on the cold modes and show that, as the temperature increases, the band structure becomes a double-humped unstable spectrum. For even larger temperatures, the double-humped structure is washed out, remaining a single-humped spectrum, but with an instability range which is similar to the cold plasma case. We then apply these results to the solar wind. |
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| ISSN: | 0032-0633 1873-5088 |
| DOI: | 10.1016/S0032-0633(98)00069-5 |