Kinetic Alfven waves generation ahead of the Earth bow shock
Heading:
| 1Malovichko, PP, Kyzyurov, YV 1Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine |
| Kinemat. fiz. nebesnyh tel (Online) 2022, 38(5):3-20 |
| https://doi.org/10.15407/kfnt2022.05.003 |
| Start Page: Space Physics |
| Language: Ukrainian |
Abstract: The paper considers the possibility of kinetic Alfven wave’s generation by high-speed protons beams ahead of the Earth bow shock. An analytical solution is obtained for the firehose instability of kinetic Alfven waves caused by the beam’s dynamic pressure. The influence of the temperature of high-speed beams and the temperature of solar wind protons on the characteristics of generated disturbances is investigated. It is shown that temperature has a significant effect on the transverse scales of disturbances. The higher the proton beam’s temperature and the lower the background plasma temperature, the stronger the restrictions imposed on the sizes of transverse wavelengths. The development of instability during the propagation of reflected, intermediate and diffusion protons beams in the pre-shock region of the Earth’s bow shock is considered. The dynamics of the motion of disturbances in this region is analyzed. |
| Keywords: Alfven waves, firehose instability, plasmas, solar wind |
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