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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >The solar magnetic field and the solar wind: Existence of preferred longitudes
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The solar magnetic field and the solar wind: Existence of preferred longitudes

机译：太阳磁场和太阳风：经度的存在

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Direct measurements of the solar wind speed and the radial component of the interplanetary magnetic field acquired over more than three solar cycles are used to search for signatures of a persistent dependence of solar wind properties on solar longitude. Two methods of analysis are used, One finds the rotation period that maximizes the amplitude of longitudinal variations of both interplanetary and near-Earth data mapped to the Sun. The other is based on power spectra of near-Earth and near-Venus data. The two methods give the same result. Preferred-longitude effects are found for a synodic solar rotation period of 27.03 +/- 0.02 days. Such high precision is attained by using several hundred thousand hourly averages of the solar wind speed and magnetic field. The 27.03-day periodicity is dominant only over long periods of time; other periodicities are often more prominent for shorter intervals such as a single solar cycle or less. The 27.03-day signal is stronger and more consistent in the magnetic field than in the solar wind speed and is stronger for intervals of high and declining solar activity than for intervals of low or rising activity. On average, solar magnetic field lines in the ecliptic plane point outward on one side of the Sun and inward on the other, reversing direction approximately every 11 years while maintaining the same phase. The data are consistent with a model in which the solar magnetic dipole returns to the same longitude after each reversal. [References: 28]
机译：直接测量太阳风速和在三个以上太阳周期内获得的行星际磁场的径向分量可用于搜索太阳风属性对太阳经度的持续依赖性的特征。有两种分析方法，一种是找到旋转周期，该旋转周期可使映射到太阳的行星际和近地数据的纵向变化幅度最大化。另一种是基于近地和近金星数据的功率谱。两种方法给出相同的结果。在太阳经旋转周期为27.03 +/- 0.02天时，发现了优选的经度效应。通过使用数十万小时的太阳风速和磁场平均值，可以达到如此高的精度。 27.03天的周期仅在很长一段时间内才占主导地位;对于较短的时间间隔（例如单个太阳周期或更短的时间），其他周期通常更为突出。 27.03天的信号在磁场中比在太阳风速时更强且更一致，并且在太阳活动高和下降的间隔中比太阳活动低或上升的间隔更强。平均而言，黄道平面中的太阳磁场线在太阳的一侧向外指向，而在另一侧则向内指向，大约每11年反转一次，同时保持相同的相位。数据与其中每次反转后太阳磁偶极子返回相同经度的模型一致。 [参考：28]

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