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首页> 外文期刊>Solar physics >Two-Station Interplanetary Scintillation Measurements of Solar Wind Speed near the Sun Using the X-band Radio Signal of the Nozomi Spacecraft
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Two-Station Interplanetary Scintillation Measurements of Solar Wind Speed near the Sun Using the X-band Radio Signal of the Nozomi Spacecraft

机译：使用Nozomi航天器的X波段无线电信号在太阳附近对太阳风速进行两站行星际闪烁测量

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摘要

Interplanetary scintillation (IPS) measurements of the solar wind speed for the distance range between 13 and 37 R _S were carried out during the solar conjunction of the Nozomi spacecraft in 2000 - 2001 using the X-band radio signal. Two large-aperture antennas were employed in this study, and the baseline between the two antennas was several times longer than the Fresnel scale for the X-band. We successfully detected a positive correlation of IPS from the cross-correlation analysis of received signal data during ingress, and estimated the solar wind speed from the time lag corresponding to the maximum correlation by assuming that the solar wind flows radially. The speed estimates range between 200 and 540 km s ~(-1) with the majority below 400 km s ~(-1). We examined the radial variation in the solar wind speed along the same streamline by comparing the Nozomi data with data obtained at larger distances. Here, we used solar wind speed data taken from 327 MHz IPS observations of the Solar-Terrestrial Environment Laboratory (STEL), Nagoya University, and in situ measurements by the Advanced Composition Explorer (ACE) for the comparison, and we considered the effect of the line-of-sight integration inherent to IPS observations for the comparison. As a result, Nozomi speed data were proven to belong to the slow component of the solar wind. Speed estimates within 30 R _S were found to be systematically slower by 10 - 15 % than the terminal speeds, suggesting that the slow solar wind is accelerated between 13 and 30 R _S.
机译：在2000年至2001年Nozomi航天器的太阳结期间，使用X波段无线电信号对13至37 R _S之间的距离范围的太阳风速进行了行星际闪烁（IPS）测量。在这项研究中使用了两个大口径天线，两个天线之间的基线比X波段的菲涅耳刻度长几倍。我们通过进入期间接收信号数据的互相关分析成功地检测到IPS的正相关，并通过假设太阳风呈放射状从对应于最大相关的时间滞后估算太阳风速。速度估计范围在200至540 km s〜（-1）之间，大多数低于400 km s〜（-1）。通过比较Nozomi数据与在较大距离获得的数据，我们检查了沿着同一流线的太阳风速的径向变化。在这里，我们使用了名古屋大学太阳地面环境实验室（STEL）的327 MHz IPS观测值获得的太阳风速数据，以及Advanced Composition Explorer（ACE）进行的原位测量进行比较，并考虑了IPS观测所固有的视线集成以进行比较。结果，Nozomi速度数据被证明属于太阳风的慢分量。发现30 R _S以内的速度估算值比终端速度有系统地降低了10-15％，这表明缓慢的太阳风在13到30 R _S之间被加速。

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