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Does Turbulence along the Coronal Current Sheet Drive Ion Cyclotron Waves?

Telloni, D; Zank, GP; Adhikari, L; Zhao, L; Susino, R; Antonucci, E; Fineschi, S; ... Slemer, A; + view all (2023) Does Turbulence along the Coronal Current Sheet Drive Ion Cyclotron Waves? Astrophysical Journal , 944 (2) p. 227. 10.3847/1538-4357/acb693. Green open access

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Abstract

Evidence for the presence of ion cyclotron waves (ICWs), 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 Alfvén ion cyclotron, mirror-mode, and firehose instabilities. The study of the polarization state of high-frequency magnetic fluctuations reveals that ICWs 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.

Type: Article
Title: Does Turbulence along the Coronal Current Sheet Drive Ion Cyclotron Waves?
Open access status: An open access version is available from UCL Discovery
DOI: 10.3847/1538-4357/acb693
Publisher version: http://dx.doi.org/10.3847/1538-4357/acb693
Language: English
Additional information: Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10166840
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