用STEREO上的波动仪器探测尘埃：由太阳风拾取的纳米粒子？
Dust detection by the wave instrument on STEREO: nanoparticles picked up by the solar wind?
摘要：
STEREO/WAVES仪器检测到大量强电压脉冲。我们认为，这些事件是由纳米粒子撞击航天器的速度的数量级的太阳风速度的影响电离。纳米粒子介于微米大小的尘埃和原子离子之间，具有如此大的荷质比，以至于太阳风磁场产生的电场可以非常有效地加速它们。由于灰尘撞击产生的电压随着速度的增加而增加得非常快，因此此类纳米颗粒产生的信号与速度较小的大颗粒一样高。以这种方式推断的10纳米半径颗粒的流量是兼容的行星际尘埃通量模型。目前的结果可能代表了快速纳米粒子在行星际空间近地球轨道的第一次检测。
英文摘要：
The STEREO/WAVES instrument has detected a very large number of intense voltage pulses. We suggest that these events are produced by impact ionisation of nanoparticles striking the spacecraft at a velocity of the order of magnitude of the solar wind speed. Nanoparticles, which are half-way between micron-sized dust and atomic ions, have such a large charge-to-mass ratio that the electric field induced by the solar wind magnetic field accelerates them very efficiently. Since the voltage produced by dust impacts increases very fast with speed, such nanoparticles produce signals as high as do much larger grains of smaller speeds. The flux of 10-nm radius grains inferred in this way is compatible with the interplanetary dust flux model. The present results may represent the first detection of fast nanoparticles in interplanetary space near Earth orbit.
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