Parker Solar Probe Enters the Magnetically Dominated Solar Corona
Parker Solar Probe Enters the Magnetically Dominated Solar Corona
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DOI：
10.1103/physrevlett.127.255101
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发表时间：
2021-12-14
影响因子：
8.6
通讯作者：
Zank, G. P.
中科院分区：
文献类型：
--
作者：
Kasper, J. C.;Klein, K. G.;Zank, G. P.
日冕的高温和强磁场形成了太阳风的气流，这些气流在太阳系中扩展到星际空间。帕克太阳探测器于世界时2021年4月28日09时33分进入光球层上方1300万公里处的太阳磁化大气层，在阿尔芬临界面下方穿越5小时进入与太阳偶然接触的等离子体，阿尔芬马赫数为0. 79，磁压主导离子压和电子压。本文报道了阿尔芬临界面以下的湍流谱。磁测图表明，该地区是一个稳定的流动出现在迅速扩大的日冕磁场线躺在上面的伪流光。亚Alfvenic流的性质可能是由于抑制磁重联的基础上的伪流光，证明了在这个地区和磁映射异常低的密度。
The high temperatures and strong magnetic fields of the solar corona form streams of solar wind that expand through the Solar System into interstellar space. At 09:33 UT on 28 April 2021 Parker Solar Probe entered the magnetized atmosphere of the Sun 13 million km above the photosphere, crossing below the Alfven critical surface for five hours into plasma in casual contact with the Sun with an Alfven Mach number of 0.79 and magnetic pressure dominating both ion and electron pressure. The spectrum of turbulence below the Alfven critical surface is reported. Magnetic mapping suggests the region was a steady flow emerging on rapidly expanding coronal magnetic field lines lying above a pseudostreamer. The sub-Alfvenic nature of the flow may be due to suppressed magnetic reconnection at the base of the pseudostreamer, as evidenced by unusually low densities in this region and the magnetic mapping.