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Observation of Alfvén Ion Cyclotron Waves in ICME Magnetic Clouds at 1 au

Dhamane, Omkar; Pawaskar, Vinit; Raghav, Anil; Shaikh, Zubair; D’Amicis, Raffaella; Ghag, Kalpesh; Kumbhar, Kishor; ... Pathare, Prachi; + view all (2023) Observation of Alfvén Ion Cyclotron Waves in ICME Magnetic Clouds at 1 au. The Astrophysical Journal , 957 (1) , Article 38. 10.3847/1538-4357/acf19f. Green open access

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Abstract

Waves in plasma play an essential role in the energy transfer and plasma-heating processes. This article discusses the in situ observation of Alfvén ion cyclotron (AIC) waves and their characteristics within interplanetary coronal mass ejection (ICME) flux ropes. We analyzed 401 ICME flux ropes, observed by WIND spacecraft from 1995 to 2021 at 1 au. We found only five ICME flux ropes that show an explicit presence of AIC waves; two have normalized magnetic helicity σm ≤ −0.5, and the remaining three show σm ≥ 0.5 polarization. The angle between velocity and magnetic field (θVB) for σm ≤ −0.5 is <40°, whereas for σm ≥ 0.5, θVB > 140°. This result supports the existence of quasi-parallel and quasi-antiparallel left-handed polarized AIC waves within ICME flux ropes. We suggest that AIC waves are possibly triggered by (i) proton temperature anisotropy Tp⊥/Tp∥ > 1 driven by cyclotron instability and (ii) low-frequency Alfvén waves through the magnetohydrodynamic turbulent cascade. This study shows evidence of fluid and kinetic scales coupling in the ICME flux rope.

Type: Article
Title: Observation of Alfvén Ion Cyclotron Waves in ICME Magnetic Clouds at 1 au
Open access status: An open access version is available from UCL Discovery
DOI: 10.3847/1538-4357/acf19f
Publisher version: http://doi.org/10.3847/1538-4357/acf19f
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/10180322
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