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

Omkar
Dhamane
University of Mumbai
Vinit Pawaskar- Department of Physics, University of Mumbai, Mumbai, India,
Anil Raghav-Department of Physics, University of Mumbai, Mumbai, India,
Zubair Shaikh- Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA
Raffaella D ' Amicis -National Institute for Astrophysics, Institute for Space Astrophysics and Planetology, Via del Fosso del Cavaliere 100, I-00133 Roma, Ital
Kalpesh Ghag- Department of Physics, University of Mumbai, Mumbai, India
Kishor Kumbhar- Department of Physics, University of Mumbai, Mumbai, India
Daniele Telloni- National Institute for Astrophysics, Astrophysical Observatory of Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy
Georgios Nicolaou- Department of Space and Climate Physics, Mullard Space Science Laboratory,University College London, Dorking, Surrey, RH5 6NT, UK
Prathmesh Tari-Department of Physics, University of Mumbai, Mumbai, India
Robert Wicks- Department of Mathematics, Physics and Electrical Engineering, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
Utsav Panchal- Department of Mathematics, Physics, and Electrical Engineering, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
Bhagyashri Sathe-Department of Physics, University of Mumbai, Mumbai, India
Prachi pathare-Department of Physics, University of Mumbai, Mumbai, India
Oral
(Student Speaker)
Plasma waves are crucial to the processes of plasma heating and energy transfer. The in-situ observation of Alfven ion cyclotron (AIC) waves and their properties within interplanetary coronal mass ejection (ICME) flux ropes are covered in this article. We examined 401 ICME flux ropes that the WIND satellite observed at 1 au between 1995 and 2021. Only five ICME flux ropes explicitly displaying AIC waves were discovered; two have normalized magnetic helicity of σm > 0.5, and the other three exhibit σm > 0.5 polarization. For σm <0.5, the angle between the magnetic field and velocity (θvB) is 40°, whereas for σm≥ 0.5, θvB > 140°. This finding confirms the presence of left-handed polarised AIC waves that are quasi-parallel and quasi-antiparallel within ICME flux-ropes. We propose that (i) proton temperature anisotropy T p/T p > 1 driven by cyclotron instability and (ii) low-frequency Alfv en waves via the magnetohydrodynamic turbulent cascade may be the sources of AIC waves. This work demonstrates that the ICME flux rope indicates fluid and kinetic scale coupling.
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4th Eddy Cross-Disciplinary Symposium