Internal structure of a coronal mass ejection revealed by Akatsuki radio occultation observations

Internal structure of a coronal mass ejection revealed by Akatsuki radio occultation observations
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晓无线电掩星观测揭示日冕物质抛射的内部结构

DOI:
10.1002/2015ja021076
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发表时间:
2015
期刊:
Journal of Geophysical Research: Space Physics
影响因子:
--
通讯作者:
B.; Nakamura M.
B.; Nakamura M.
中科院分区:
--
文献类型:
--
作者:
Ando;H.; Shiota;D.; Imamura;T.; Tokumaru;M.; Asai;A.; Isobe;H.; Patzold;M.; Hausler;B.; Nakamura M.

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使用Akatsuki航天器通过无线电掩星测量在日心距离12.7R观测到日冕物质抛射(CME)。得到了CME体速度和电子柱密度沿着射线路径的时间变化,并在不规则体沿射线路径传输的假设下,反演了CME从核到尾的内部结构.建议的内部结构进行了比较,大角度光谱日冕物质抛射图像,数值研究和以前的无线电掩星观测CME提出一个模型;体速度和电子密度有相对较大的值在核心,减少核心后面,并再次增加在尾部区域的快速等离子体流与磁场重联收敛。这意味着日冕物质抛射背后的磁场重联可能至少会持续到日心距离为1013R。
A coronal mass ejection (CME) was observed at the heliocentric distance of 12.7Rυby radio occultation measurements using the Akatsuki spacecraft. The temporal developments of the bulk velocity and the electron column density along the raypath traversing the CME were obtained, and under the assumption that the irregularities are transported across the raypath, the internal structure of the CME covering the region from the core to the tail was retrieved. The suggested internal structure was compared with Large Angle Spectroscopic Coronagraph images, a numerical study and previous radio occultation observations of CMEs to propose a CME model; the bulk velocity and the electron density have relatively large values in the core, decrease behind the core, and increase again in the tail region where the fast plasma flow associated with the magnetic reconnection converges. This implies that the magnetic reconnection behind the CMEs might continue up to at least the heliocentric distance of ∼13Rυ.
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