Multiscale Solar Wind Turbulence Properties inside and near Switchbacks measured by Parker Solar Probe
Mihailo M. Martinović, Kristopher G. Klein, Jia Huang, Benjamin D. G. Chandran, Justin C. Kasper, Emily Lichko, Trevor Bowen, Christopher H. K. Chen, Lorenzo Ma… 展开作者
Mihailo M. Martinović, Kristopher G. Klein, Jia Huang, Benjamin D. G. Chandran, Justin C. Kasper, Emily Lichko, Trevor Bowen, Christopher H. K. Chen, Lorenzo Matteini, Michael Stevens, Anthony W. Case, Stuart D. Bale
Parker Solar Probe (PSP) routinely observes magnetic field deflections in the solar wind at distances less than 0.3 au from the Sun. These deflections are related to structures commonly called 'switchbacks' (SBs), whose origins and characteristic properties are currently debated. Here, we use a database of visually selected SB intervals - and regions of solar wind plasma measured just before and after each SB - to examine plasma parameters, turbulent spectra from inertial to dissipation scales, and intermittency effects in these intervals. We find that many features, such as perpendicular stochastic heating rates and turbulence spectral slopes are fairly similar inside and outside of SBs. However, important kinetic properties, such as the characteristic break scale between the inertial to dissipation ranges differ inside and outside these intervals, as does the level of intermittency, which is notably enhanced inside SBs and in their close proximity, most likely due to magnetic field and velocity shears observed at the edges. We conclude that the plasma inside and outside of a SB, in most of the observed cases, belongs to the same stream, and that the evolution of these structures is most likely regulated by kinetic processes, which dominate small scale structures at the SB edges.
Analysis of the distribution, rotation and scale characteristics of solar wind switchbacks: comparison between the first and second encounters of Parker Solar Probe
Possible Evolution of Minifilament-Eruption-Produced Solar Coronal Jets, Jetlets, and Spicules, into Magnetic-Twist-Wave "Switchbacks" Observed by the Parker Solar Probe (PSP)
Turbulence characteristics of switchbacks and non-switchbacks intervals observed by \emph{Parker Solar Probe}
我们使用\emph{Parker Solar Probe}（\emph{PSP}）的现场测量，以分析太阳风湍流的特征，在第一次太阳相遇期间覆盖径向距离之间的$35.7R_\odot$和$41.7R_\odot$。在我们的分析中，我们将所谓的之字形（SB）间隔（折叠磁场线）与非之字形（NSB）间隔（主要遵循帕克螺旋场）隔离开来。使用一种基于条件关联函数的技术，我们分别在SB和NSB间隔中估计了Elsasser、磁场和体速度场的功率谱。通过对两种间隔的湍流能谱的比较，我们发现了以下特点：1）后向传播Elsasser场$z^-$的去相关长度在NSB间隔中比在SB间隔中大;（2）SB层段的磁功率谱比NSB层段陡，谱指数接近-5/3，其具有接近-3/2的光谱指数; 3）SB和NSB湍流都是不平衡的，NSB具有最大的交叉螺旋度，4）SB间隔中的剩余能量大于NSB，以及5）所分析的波动由在\emph{sunward}中传播的Alfvénic波动主导（\emph{anti-sunward}）方向，用于SB（NSB）湍流。这些观察到的特征提供了进一步的证据，证明\emph{PSP}观察到的之字形与折叠磁场线有关，从而深入了解其湍流性质。
Correlation of the sunspot number and the waiting time distribution of solar flares, coronal mass ejections, and solar wind switchback events observed with the Parker Solar Probe
Generation and Expansion-Driven Growth of Switchbacks in the Outer Solar Corona and Solar Wind
Imperial College London（帝国理工学院）；University of California, Los Angeles（加州大学洛杉矶分校）；Auburn University（奥本大学）；Space Sciences Laboratory, University of California, Berkeley（加州大学伯克利分校空间科学实验室）；Istituto per la Scienza e Tecnologia dei Plasmi (ISTP), Consiglio Nazionale delle Ricerche（等离子体科学与技术研究所，意大利国家研究委员会）；The University of Texas at Austin（德克萨斯大学奥斯汀分校）
Features of magnetic field switchbacks in relation to the local-field geometry of large-amplitude Alfvénic oscillations: \emph{Wind} and \emph{PSP} observations
Properties of Magnetic Switchbacks in the Near-Sun Solar Wind
Center for Astrophysics, Harvard & Smithsonian（哈佛-史密森天体物理中心）；Institut de Recherche en Astrophysique et Planétologie, CNES, CNRS, Université de Toulouse（天体物理学与行星学研究所，法国国家空间研究中心，法国国家科学研究中心，图卢兹大学）；Department of Physics, Imperial College London（帝国理工学院物理系）；Space Sciences Laboratory, University of California, Berkeley（加州大学伯克利分校空间科学实验室）；Astronomy and Space Physics Department, National Taras Shevchenko University of Kyiv（基辅塔拉斯舍甫琴科国立大学天文与空间物理系）；Department of Climate and Space Sciences and Engineering, University of Michigan（密歇根大学气候与空间科学与工程系）；LPC2E, OSUC, Univ Orleans, CNRS, CNES（奥尔良大学地球与环境过程实验室，观测与研究宇宙学与气候系统观测站，法国国家科学研究中心，法国国家空间研究中心）；International Space Science Institute（国际空间科学研究所）
Direct evidence of non-ideal MHD in the solar wind and switchbacks
Space Sciences Laboratory, University of California, Berkeley（加州大学伯克利分校空间科学实验室）；Physics Department, University of California, Berkeley（加州大学伯克利分校物理系）；Physics Department, University of Alberta（阿尔伯塔大学物理系）
Averaging Effects on the Solar Wind Alfven Mach Number: Implications for Switchbacks and Alfven Transition
University of Delaware（特拉华大学）；Princeton University（普林斯顿大学）；University of California, Berkeley（加州大学伯克利分校）；Mahidol University（玛希隆大学）；University of Orléans（奥尔良大学）；Kasetsart University（泰国农业大学）；NASA Goddard Space Flight Center（美国宇航局戈达德太空飞行中心）
Coherent events at ion scales in the inner Heliosphere: \textit{Parker Solar Probe} observations during the first Encounter
\textit{Parker Solar Probe}在其第一个近日点嵌入一个高度阿尔夫文慢流时，已经显示出普遍存在的强磁场偏转，即之字形。在这里，我们研究的湍流磁场波动的离子尺度在三个间隔，其特征在于一个不同的之字形活动，确定的行为的磁场径向分量，$B_r$。\textit{Quiet}（$B_r$未显示出显著波动）、\textit{weak}（$B_r$具有强波动但无反转）和\textit{strong}（$B_r$具有完全反转）周期也显示出离子量和Alfvénicity的不同行为。然而，光谱分析表明，每个流的特征在于由典型的Kolmogorov/Kraichnan幂律在惯性范围内，其次是周围的特征离子尺度的休息。该频率范围的特征在于强间歇性活动，存在非压缩相干结构，例如电流片和涡旋状结构，以及被识别为离子回旋模式的波包。虽然，所有这些间歇性事件已被检测到的三个时期，他们有不同的影响，在他们每个人。电流片在\textit{strong}周期中占主导地位，波包在\textit{quiet}间隔中最常见;而在\textit{weak}周期中，观察到涡旋和波包的混合物。这项工作提供了一个深入了解加热问题的碰撞无等离子体，适合在新的太阳能任务的背景下，特别是\textit{Solar Orbiter}，这将允许一个准确的磁连通性分析，链接到源区域的不同的间歇性事件的存在。
Near-Sun Switchbacks Show Statistical Signatures of Solar Activity
Inter-University Centre for Astronomy and Astrophysics（大学间天文与天体物理中心）；International Space Science Institute（国际空间科学研究所）；LPC2E, OSUC, Univ Orleans, CNRS, CNES（地球与行星物理学实验室，观测宇宙学与气候环境统一研究组织，奥尔良大学，法国国家科学研究中心，法国国家太空研究中心）；SETI Institute（搜寻地外文明研究所）；Lockheed Martin Solar and Astrophysics Laboratory（洛克希德·马丁太阳与天体物理实验室）
