Several kinds of instabilities are often observed in the solar wind. We studied the linear theory of the current-driven electrostatic ion acoustic instability at frequencies near the ion cyclotron frequency at distances from the Sun over 0.3 to 1 AU. The properties of current driven electrostatic ion-acoustic instability are investigated. The instability parameters, such as angular wave frequency, the critical drift velocity and the growth rate are calculated. We used the dispersion relation in hot magnetized plasma to calculate the current driven ion acoustic instability properties. To determine the critical drift velocity and the growth rate a full numerical solution of the dispersion relation equation is carried out. Since the growth rate of instability depends on the wave normal angle, the drift velocity of the electron along the magnetic field and the ion thermal cyclotron radius, the calculation is carried out for ranging of the wave normal angles, drift velocities and ion thermal cyclotron radius. The results show that the growth rate of instability increases with increasing distance from the Sun. The growth rate of instability increases with decreasing the wave normal angle, but the critical drift velocity decreases with decreasing the wave normal angle.

中文翻译：

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距离太阳 0.3 到 1 天文单位的电流驱动离子声不稳定性的线性理论

在太阳风中经常观察到几种不稳定性。我们研究了电流驱动的静电离子声学不稳定性的线性理论，其频率接近离子回旋频率，距离太阳超过 0.3 到 1 个天文单位。研究了电流驱动的静电离子声不稳定性的特性。计算了角波频率、临界漂移速度和增长率等不稳定参数。我们使用热磁化等离子体中的色散关系来计算电流驱动的离子声学不稳定性特性。为了确定临界漂移速度和生长速率，对色散关系方程进行了完整的数值求解。由于不稳定的增长率取决于波的法线角，电子沿磁场的漂移速度和离子热回旋半径，对波法向角、漂移速度和离子热回旋半径的测距进行计算。结果表明，不稳定的增长率随着与太阳距离的增加而增加。不稳定性的增长率随着波法线角的减小而增加，但临界漂移速度随着波法线角的减小而减小。