分类： 天文学 >> 天文学 提交时间： 2023-02-19
Daniele Telloni
Gary P. Zank
Laxman Adhikari
Lingling Zhao
Roberto Susino
Ester Antonucci
Silvano Fineschi
Marco Stangalini
Catia Grimani
Luca Sorriso-Valvo
Daniel Verscharen
Raffaele Marino
Silvio Giordano
Raffaella D'Amicis
Denise Perrone
Francesco Carbone
Alessandro Liberatore
Roberto Bruno
Gaetano Zimbardo
Marco Romoli
摘要： Evidence for the presence of ion cyclotron waves, driven by turbulence, at the boundaries of the current sheet is reported in this paper. By exploiting the full potential of the joint observations performed by Parker Solar Probe and the Metis coronagraph on board Solar Orbiter, local measurements of the solar wind can be linked with the large-scale structures of the solar corona. The results suggest that the dynamics of the current sheet layers generates turbulence, which in turn creates a sufficiently strong temperature anisotropy to make the solar-wind plasma unstable to anisotropy-driven instabilities such as the Alfv\'en ion-cyclotron, mirror-mode, and firehose instabilities. The study of the polarization state of high-frequency magnetic fluctuations reveals that ion cyclotron waves are indeed present along the current sheet, thus linking the magnetic topology of the remotely imaged coronal source regions with the wave bursts observed in situ. The present results may allow improvement of state-of-the-art models based on the ion cyclotron mechanism, providing new insights into the processes involved in coronal heating.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Ruggero Biondo
Alessandro Bemporad
Paolo Pagano
Daniele Telloni
Fabio Reale
Marco Romoli
Vincenzo Andretta
Ester Antonucci
Vania Da Deppo
Yara De Leo
Silvano Fineschi
Petr Heinzel
Daniel Moses
Giampiero Naletto
Gianalfredo Nicolini
Daniele Spadaro
Marco Stangalini
Luca Teriaca
Federico Landini
Clementina Sasso
摘要： As a key feature, NASA's Parker Solar Probe (PSP) and ESA-NASA's Solar Orbiter (SO) missions cooperate to trace solar wind and transients from their sources on the Sun to the inner interplanetary space. The goal of this work is to accurately reconstruct the interplanetary Parker spiral and the connection between coronal features observed remotely by the Metis coronagraph on-board SO and those detected in situ by PSP at the time of the first PSP-SO quadrature of January 2021. We use the Reverse In-situ and MHD Approach (RIMAP), a hybrid analytical-numerical method performing data-driven reconstructions of the Parker spiral. RIMAP solves the MHD equations on the equatorial plane with the PLUTO code, using the measurements collected by PSP between 0.1 and 0.2 AU as boundary conditions. Our reconstruction connects density and wind speed measurements provided by Metis (3-6 solar radii) to those acquired by PSP (21.5 solar radii) along a single streamline. The capability of our MHD model to connect the inner corona observed by Metis and the super Alfv\'enic wind measured by PSP, not only confirms the research pathways provided by multi-spacecraft observations, but also the validity and accuracy of RIMAP reconstructions as a possible test bench to verify models of transient phenomena propagating across the heliosphere, such as coronal mass ejections, solar energetic particles and solar wind switchbacks.
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