论文标题
触发离子声波
Triggered Ion-acoustic Waves
论文作者
论文摘要
Parker太阳能探头位于13.3太阳半径的轨道12的太阳轨道上。该卫星上的电场实验观察到我们称之为触发的离子声波，是在太阳径向距离15-25太阳半径的太阳径向距离内的最主要波模式。在这种模式下，几个Hz静电波通常伴随着几百Hz波的爆发，其爆发在每个低频波周期中被相锁定。这些波伴随着Δn/n〜0.1的血浆密度波动，并且没有磁场成分。波浪持续时间可能是小时，其场和密度波动几乎是纯正弦波。它们被识别为离子声波。测量低频和高频波在实验不确定性中具有相同的相速度，这是与它们的相位锁定关系相关的要求。从测得的波长中，与低频波相关的电势估计为约10伏，这可能会导致通过Landau共振的电子加热，这与观察到的核心电子温度在此类波时的观察结果一致。他们的相位锁定关系和纯频率是令人惊讶的特征，它表征了以前可能没有报道过的离子声波的新态度和离子声波演变的特征。这些波是与自然过程无关的工具效应。尽管这不太可能，但这些波浪是人为的可能性不能排除在外
The Parker Solar Probe is in a solar orbit with a perihelion for orbit 12 at 13.3 solar radii. The electric field experiment on this satellite observes what we call triggered ion-acoustic waves as the most dominant wave mode above a few Hz within the solar radial distance of 15-25 solar radii. In this mode, a few Hz electrostatic wave is typically accompanied by bursts of a few hundred Hz wave whose bursts are phase locked with each low frequency wave period. Plasma density fluctuations with Δn/n~0.1 accompany these waves and they have no magnetic field component. The wave durations can be hours and their field and density fluctuations are nearly pure sine waves. They are identified as ion-acoustic waves. The low and high frequency waves are measured to have the same phase velocity within experimental uncertainties, which is a requirement associated with their phase locked relationship. From the measured wavelength, the potential associated with the low frequency wave is estimated to be ~10 Volts, which can result in electron heating via the Landau resonance that is in agreement with observations of the core electron temperature increases at times of such waves. Their phase locked relationship and pure frequency are surprising features that characterize a new regime of instability and evolution of ion-acoustic waves that may not have been reported previously. That these waves are an instrumental effect unrelated to natural processes is considered. While this is unlikely, the possibility that these waves are artificial cannot be rule out
