We propose a new method to scan the data and then to infer the boundaries of the interplanetary coronal mass ejections, especially the interplanetary events observed by \emph{Ulysses}.
The local minima of the temperatures ratio measured by the spacecraft are used to scan and compute the potential boundaries of the interplanetary events.
The low plasma beta values are then invoked to detect at least four boundaries, two for the beginning and two for the end of an interplanetary coronal mass ejection (ICME). Intermediate boundaries can be identified, as indicated by other plasma and magnetic field signatures, and these ones mark substructures of a complex event.
Using the algorithm described in this article, we have compiled a list of the ICME events registered by \emph{Ulysses} spacecraft during 2000-2002, with their boundaries.
After a statistical analysis, four relationships of the plasma beta with the speed are then inferred for the computed ICMEs, for each of the four detected boundaries in our compiled list.
In order to exemplify the method we analyse in detail four events.
This method provides premises for an alternative way of semi-automatic detection of the interplanetary events' boundaries observed by \emph{Ulysses} spacecraft.
We introduce here also a method for visualisation of the magnetic field components that allows detection of plasma insulations and boundaries detection for other satellites too.
On the magnetic field evolution of interplanetary coronal mass ejections from 0.07 to 5.4 au
Austrian Space Weather Office, GeoSphere Austria(奥地利空间天气办公室,GeoSphere奥地利);Institute of Physics, University of Graz(格拉茨大学物理研究所);Goddard Planetary Heliophysics Institute, University of Maryland, Baltimore County(马里兰大学巴尔的摩分校戈达德行星日球物理学研究所);Heliophysics Science Division, NASA Goddard Space Flight Center(NASA戈达德太空飞行中心日球物理学科学部);Community Coordinated Modeling Center, NASA Goddard Space Flight Center(NASA戈达德太空飞行中心社区协调建模中心);Imperial College London(帝国理工学院伦敦)
Tracking a beam of electrons from the low solar corona into interplanetary space with the Low Frequency Array, Parker Solar Probe and 1 au spacecraft
III型射电暴是温和相对论性电子束从低日冕传播到日光层的等离子体发射的结果,如果它们与日光层航天器的位置对齐,最终可以在原地检测到。在这里,我们观察到一个III型射电爆发从0.1-16兆赫使用帕克太阳探测器(PSP)领域的射频频谱仪(RFS),并从20-80兆赫使用低频阵列(LOFAR)。该事件与任何可检测到的耀斑活动无关,但属于PSP遭遇2期间发生的持续III型噪声风暴的一部分。LOFAR射电源向三维空间的反投影表明,III型射电爆发源位于1.6-3 R $_\odot$的开放磁场上,起源于东经48 $^o$附近的近赤道活动区。结合PSP/RFS观测与风/波和立体声/波,我们重建的第三类射电源轨迹在日光层内部PSP的位置,假设黄道约束。随后在STEREO-A航天器上在兼容的时间原位检测到高能电子增强,尽管开始和持续时间表明单独的爆发有助于增强的一个子集。这项工作表明,日冕中相对小规模的通量出现可以导致电子束从低日冕注入日光层,而不需要强烈的太阳耀斑。这项研究还明确强调了地面和天基无线电观测相结合的互补性,特别是在PSP时代。
Automatic Detection of Interplanetary Coronal Mass Ejections in Solar Wind In Situ Data
Space Research Institute, Austrian Academy of Sciences(奥地利科学院空间研究所);Zentralanstalt für Meteorologie und Geodynamik(奥地利气象与地球动力学中央研究所);Know-Center GmbH(Know-Center有限公司);Institute of Physics, University of Graz(格拉茨大学物理研究所);Institute of Interactive Systems and Data Science, Graz University of Technology(格拉茨工业大学交互系统与数据科学研究所);Washington University in St. Louis(圣路易斯华盛顿大学);AI AUSTRIA(奥地利人工智能协会)
Visualizing the Magnetic Structure in Interplanetary Coronal Mass Ejections with ATHARV
Indian Institute of Science (IISc)(印度科学研究所);Aryabhatta Research Institute of Observational Sciences (ARIES)(阿里亚巴塔观测科学研究所);Mahatma Jyotiba Phule Rohilkhand University(马哈特玛·乔蒂巴·普尔罗希尔坎德大学);Indian Institute of Technology Delhi(德里印度理工学院);Indian Institute of Space Science and Technology (IIST)(印度空间科学与技术学院);IISER Kolkata(加尔各答印度科学教育研究所)
行星际日冕物质抛射(ICME)等离子体化学成分的确定是一个悬而未决的问题。更具体地说,人们还没有完全理解在太阳扰动期间对日冕等离子体的遥感观测如何演变成远离太阳的原地测量的等离子体特性。背景行星际等离子体的环境条件对空间天气很重要,因为它们影响扰动的演化、到达时间和地球效应。RIMAP(Reverse In Situ and MHD APproach)是一种直接利用1天文单位(AU)观测数据重建黄道面(包括磁帕克螺线)日光层的技术。它结合了分析和数值方法,保留了小尺度的风流线的纵向变化。在这项工作中,我们使用RIMAP来测试ICME与行星际介质的相互作用。我们的传播模型的均匀非磁化(即没有内部磁绳)云开始在800公里s-1在0.1 AU到1.1 AU。我们用PLUTO MHD代码进行的3D磁流体动力学(MHD)模拟显示,在ICME之前形成了一个压缩锋,不断受到云膨胀的驱动。使用被动示踪剂,我们发现,最初的ICME材料在其传播过程中不碎片后面的前面,我们量化的传播等离子体云与周围的太阳风等离子体,这可以检测到在1 AU的混合。