标题： 大振幅阿尔芬波加热和加速太阳风的就地观测 显示英文标题

标题： In situ observations of large amplitude Alfvén waves heating and accelerating the solar wind

摘要： 在离开太阳日冕后，太阳风继续加速并冷却，但比自由膨胀的绝热气体预期的速度慢。 我们利用帕克太阳探测器和太阳轨道飞行器的就地测量数据，研究了太阳风穿过内日球层时的情况。 观测结果显示，在日冕外缘到金星轨道附近的等离子体被加热和加速，这与大振幅阿尔芬波的存在有关。 阿尔芬波是星际磁场中的扰动，能传输能量。 我们的计算表明，阿尔芬波的阻尼效应和机械功足以在内日球层中为快速太阳风的加热和加速提供足够的能量。 显示英文摘要

摘要： After leaving the Sun's corona, the solar wind continues to accelerate and cools, but more slowly than expected for a freely expanding adiabatic gas. We use in situ measurements from the Parker Solar Probe and Solar Orbiter spacecrafts to investigate a stream of solar wind as it traverses the inner heliosphere. The observations show heating and acceleration of the the plasma between the outer edge of the corona and near the orbit of Venus, in connection to the presence of large amplitude Alfv\'en waves. Alfv\'en waves are perturbations in the interplanetary magnetic field that transport energy. Our calculations show the damping and mechanical work performed by the Alfv\'en waves is sufficient to power the heating and acceleration of the fast solar wind in the inner heliosphere.