LONGITUDINAL DRIFTS OF STREAMERS ACROSS THE HELIOSPHERIC CURRENT SHEET
LONGITUDINAL DRIFTS OF STREAMERS ACROSS THE HELIOSPHERIC CURRENT SHEET
复制标题
流光穿过日球层电流片的纵向漂移
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
H. Morgan
中科院分区：
文献类型：
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作者：
H. Morgan
位场源表面（PFSS）的光球磁场外推提供了一个定性正确的模型的日冕磁结构。我们表明，PFSS提供的磁结构描述了一个框架内，高密度的日冕流光分布。然而，密度结构具有相当大的自由度来沿着磁结构纵向漂移。因此，当使用PFSS模型作为日冕密度结构的替代时，必须谨慎。特别是，虽然使用PFSS模型测量日冕旋转提供了大尺度磁结构旋转的估计，但它们不是密度旋转的有效测量。此外，试图在很长一段时间内为电子日冕分配一个一致的旋转速率并不总是有效的，因为运动是由结构重构主导的。利用LASCO C2/Solar and Heliospheric Observatory在1996-1997年太阳活动极小期（Solar minimum）对太阳自转层析成像的观测结果，揭示了4 R高度上赤道流注带的密度变化结构。
Potential field source surface (PFSS) extrapolations of the photospheric magnetic field provide a qualitatively correct model of the coronal magnetic structure. We show that the magnetic structure provided by PFSS describes a framework within which high-density coronal streamers are distributed. However, the density structures have considerable freedom to drift longitudinally along the magnetic structure. Some caution must therefore be taken when using PFSS models as proxies for the coronal density structure. In particular, while measurements of coronal rotation using PFSS models provide an estimate of the large-scale magnetic structure rotation, they are not valid measurements of the density rotation. Furthermore, attempts to assign a consistent rate of rotation to the electron corona over long time periods are not always valid since the movement is dominated by structural reconfiguration. These conclusions are reached by the application of solar rotational tomography to LASCO C2/Solar and Heliospheric Observatory observations during solar minimum (1996–1997), revealing the changing density structure of the equatorial streamer belt at a height of 4 R☉.