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arXiv 1206.1273astro-ph.GA
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太阳附近的星际磁场II

The Interstellar Magnetic Field Close to the Sun II

P. C. Frisch, B-G Andersson, A. Berdyugin, V. Piirola, R. DeMajistre, H. O. Funsten, A. M. Magalhaes, D. B. Seriacopi, D. J. McComas, N. A. Schwadron, J. D. Sla… 展开作者

P. C. Frisch, B-G Andersson, A. Berdyugin, V. Piirola, R. DeMajistre, H. O. Funsten, A. M. Magalhaes, D. B. Seriacopi, D. J. McComas, N. A. Schwadron, J. D. Slavin, S. J. Wiktorowicz

摘要:

太阳银河系环境的一个关键指标是由星际介质(ISM)中的磁场提供的,它影响着日光层的形状。附近的星际磁场(ISMF)的方向是由ISM中偏振的星光确定的。局部ISMF方向是从ISMF方向找到的,该ISMF方向提供了对附近恒星的偏振位置角的最佳拟合,使用对数据的加权拟合。新的极化观测包括在分析中。最适合的ISMF接近于由星际边界探测器航天器发现的高能中性原子带中心追踪的磁场方向。局部ISM的磁场和运动学都与局部ISM是Loop I超级气泡的片段的情况一致。在PlanetPol数据显示极化随距离增加的区域中发现了本地ISMF的有序分量。它延伸到太阳的8秒差距内,暗示着附近ISMF的弱曲率。有序分量的变化表明湍流度为+/-23度。局部ISMF在8-200秒差距的空间尺度上方向通常是均匀的,因此它看起来类似于臂间磁场。最佳拟合ISMF方向也同意的位置,在GeV-TeV星系宇宙射线的尾巴在空间不对称性。这些新的结果支持CMB偶极矩,日球鼻,和本地ISMF之间的特殊几何关系。辐射扭矩不太可能在这些极化的晶粒排列中发挥作用。

英文摘要:

A key indicator of the galactic environment of the Sun is provided by the magnetic field in the interstellar medium (ISM), which influences the shape of the heliosphere. The direction of the nearby interstellar magnetic field (ISMF) is determined from starlight polarized in the ISM. The local ISMF direction is found from the ISMF direction that provides the best fit to the polarization position angles of nearby stars, using weighted fits to the data. New polarization observations are included in the analysis. The best-fitting ISMF is close to the magnetic field direction traced by the center of the Ribbon of energetic neutral atoms, discovered by the Interstellar Boundary Explorer spacecraft. Both the magnetic field and kinematics of the local ISM are consistent with a scenario where the local ISM is a fragment of the Loop I superbubble. An ordered component of the local ISMF is found in a region where PlanetPol data show that polarization increases with distance. It extends to within 8 parsecs of the Sun and implies a weak curvature in the nearby ISMF. Variations from the ordered component indicate turbulence of +/-23 deg. The local ISMF is generally uniform in direction over spatial scales of 8-200 parsecs so that it appears similar to interarm magnetic fields. The best-fitting ISMF direction also agrees with the position of tail-in spatial asymmetries in GeV-TeV galactic cosmic rays. The peculiar geometrical relation between the CMB dipole moment, the heliosphere nose, and local ISMF is supported by these new results. Radiative torques are not likely to play a role in grain alignment for these polarizations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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