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Interplanetary magnetic field and solar rotation

机译:行星际磁场与太阳旋转

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This article presents analysis of interplanetary magnetic field (IMF) B measured at the L_1 point outside the geo-magnetosphere. The autocorrelation of daily values of the B_x and B_y component of the IMF reveal clear solar rotational modulation. The B_z (z-component of IMF) mostly do not show any such modulation. The sidereal solar rotation period are estimated from the IMF data of ACE satellite during 1998-2009. These estimates vary from 24.1 to 25.8 days with a mean value ~25 days. These annual values are compared with the estimates by the similar method using solar disk integrated radio flux at 2.8 GHz and solar images. The images used are (1) Radio images at 17 GHz and (2) X-ray images by Yohkoh satellite. The comparison reveals evidence that the IMF seems to mostly originate from the low latitude regions in the solar atmosphere rather than from higher latitudes. The results contradict the existing solar magnetic field model.
机译:本文介绍了在地磁层以外的L_1点处测量的行星际磁场(IMF)B的分析。 IMF的B_x和B_y分量的每日值的自相关揭示了清晰的太阳旋转调制。 B_z(IMF的z分量)通常不显示任何此类调制。恒星太阳自转周期是根据ACE卫星的IMF数据在1998-2009年估算的。这些估计值从24.1天到25.8天不等,平均值约为25天。使用类似的方法,使用2.8 GHz的太阳磁盘集成无线电通量和太阳图像,将这些年值与估算值进行比较。使用的图像是(1)17 GHz的无线电图像和(2)Yohkoh卫星的X射线图像。比较结果表明,IMF似乎主要来自太阳大气中的低纬度地区,而不是高纬度地区。结果与现有的太阳磁场模型相矛盾。

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