Prospective Out-of-ecliptic White-light Imaging of Coronal Mass Ejections Traveling through the Corona and Heliosphere
Prospective Out-of-ecliptic White-light Imaging of Coronal Mass Ejections Traveling through the Corona and Heliosphere
复制标题
穿过日冕和日光层的日冕物质抛射的前瞻性黄道外白光成像
DOI：
10.3847/1538-4357/aaa028
复制
发表时间：
2018-01
影响因子：
4.9
通讯作者：
Yang Liping
中科院分区：
文献类型：
--
作者：
Xiong Ming;Davies Jackie A.;Harrison Richard A.;Zhou Yufen;Feng Xueshang;Xia Lidong;Li Bo;Liu Ying D.;Hayashi Keiji;Li Huichao;Yang Liping
Coriolis/SMEI和STEREO/HI仪器的飞行性能证实了在内日光层日冕物质抛射（CME）白光（WL）成像的高技术准备水平。传播的CME的WL强度由其演化的质量分布和固定的汤姆逊散射几何形状共同决定。SMEI和HI是迄今为止唯一的太阳层成像仪，它们从黄道内的角度综合了日冕物质抛射的纵向维度。在本文中，使用前向磁流体动力学模拟，我们合成的WL辐射图案的一个典型的晕CME从一个出黄道（OOE）的Vantage位置。在WL图像中确定的日冕物质抛射的主要解剖元素是一个领先的鞘和尾随喷出物，喷出物驱动鞘是日冕物质抛射的最明亮的功能。鞘，一个三维（3D）圆顶状的密度结构，占据了喷出物本身前面的一个广泛的角度范围。鞘层的2D辐射图案严重依赖于视点。对于在太阳极小期条件下模拟的CME，当从黄道角度观察时，鞘层的WL辐射图案通常是准直带，而从OOE角度观察时是半圆弧。的依赖性的辐射图案的喷射驱动鞘的观点是由于双峰性质的三维背景太阳风流。我们的正演模拟结果表明，在WL辐射的OOE成像可以使（1）近黄道CME连续跟踪从它的日冕开始，（2）CME的纵向跨度容易制图，（3）CME的传输速度可靠地确定。附加的WL偏振测量可以显著限制CME定位的模糊性。我们断言，一个全景OOE视图在WL将是非常有益的揭示CME形态和运动学在hitherto-unresolved纵向尺寸，因此监测传播和演变的近黄道CME的空间天气业务。
The in-flight performance of the Coriolis/SMEI and STEREO/HI instruments substantiates the high-technology readiness level of white-light (WL) imaging of coronal mass ejections (CMEs) in the inner heliosphere. The WL intensity of a propagating CME is jointly determined by its evolving mass distribution and the fixed Thomson-scattering geometry. From their in-ecliptic viewpoints, SMEI and HI, the only heliospheric imagers that have been flown to date, integrate the longitudinal dimension of CMEs. In this paper, using forward magnetohydrodynamic modeling, we synthesize the WL radiance pattern of a typical halo CME viewed from an out-of-ecliptic (OOE) vantage point. The major anatomical elements of the CME identified in WL imagery are a leading sheath and a trailing ejecta; the ejecta-driven sheath is the brightest feature of the CME. The sheath, a three-dimensional (3D) dome-like density structure, occupies a wide angular extent ahead of the ejecta itself. The 2D radiance pattern of the sheath depends critically on viewpoint. For a CME modeled under solar minimum conditions, the WL radiance pattern of the sheath is generally a quasi-straight band when viewed from an in-ecliptic viewpoint and a semicircular arc from an OOE viewpoint. The dependence of the radiance pattern of the ejecta-driven sheath on viewpoint is attributed to the bimodal nature of the 3D background solar wind flow. Our forward-modeling results suggest that OOE imaging in WL radiance can enable (1) a near-ecliptic CME to be continuously tracked from its coronal initiation, (2) the longitudinal span of the CME to be readily charted, and (3) the transporting speed of the CME to be reliably determined. Additional WL polarization measurements can significantly limit the ambiguity of localizing CMEs. We assert that a panoramic OOE view in WL would be highly beneficial in revealing CME morphology and kinematics in the hitherto-unresolved longitudinal dimension and hence for monitoring the propagation and evolution of near-ecliptic CMEs for space weather operations.
登录
查看更多内容
从 1 R-s 到 1 AU 的太阳风数据驱动建模
影响因子：
2.8
作者：
Feng Xueshang;Ma Xiaopeng;Xiang Changqing
通讯作者：
Xiang Changqing
影响因子：
10.3
作者：
A. Vourlidas;R. Howard;S. Plunkett;C. Korendyke;A. Thernisien;D. Wang;N. Rich;M. T. Carter
通讯作者：
A. Vourlidas;R. Howard;S. Plunkett;C. Korendyke;A. Thernisien;D. Wang;N. Rich;M. T. Carter
用于空间天气任务的太阳极轨道望远镜项目概述
DOI：
10.11728/cjss2016.03.245
发表时间：
2016
期刊：
空间科学学报
影响因子：
--
作者：
熊明;刘颍;刘浩;李保权;郑建华;张成;夏利东;张红鑫等
通讯作者：
张红鑫等
强烈的日冕通道和太阳风暴的行星际演化直至地球和火星
影响因子：
16.6
作者：
Mostl, Christian;Rollett, Tanja;Frahm, Rudy A.;Liu, Ying D.;Long, David M.;Colaninno, Robin C.;Reiss, Martin A.;Temmer, Manuela;Farrugia, Charles J.;Posner, Arik;Dumbovic, Mateja;Janvier, Miho;Demoulin, Pascal;Boakes, Peter;Devos, Andy;Kraaikamp, Emil;Mays, Mona L.;Vrsnak, Bojan
通讯作者：
Vrsnak, Bojan
影响因子：
2.8
作者：
M. Xiong;J. Davies;M. Bisi;M. Owens;R. Fallows;G. Dorrian
通讯作者：
M. Xiong;J. Davies;M. Bisi;M. Owens;R. Fallows;G. Dorrian