Observation of Alfven wave in ICME-HSS interaction region

Omkar, Dhamane,; Raghav, Anil; Shaikh, Zubair A.; Panchal, Utsav; Kalpesh, Ghag,; Prathmesh, Tari,; Chorghe, Komal; Bhaskar, Ankush; Mishra, Wageesh

doi:10.48550/arxiv.2209.04682

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“…It is also proposed that they may be triggered by some physical processes happening locally (Bavassano et al 2001;Bruno & Carbone 2013). Recently, we found their existence during CME-CME and CME-HSS interactions, and inside the ICME sheath regions (Raghav & Kule 2018a, 2018bDhamane et al 2022;Raghav et al 2022). Moreover, AWs play a key role in modulating the recovery phase of geomagnetic storms and slowing down the restoration of the magnetosphere toward its pre-storm equilibrium state (Raghav et al 2018(Raghav et al , 2019Shaikh et al 2019b;Choraghe et al 2021;Telloni et al 2021).…”

Section: Introductionmentioning

confidence: 89%

First Analysis of In Situ Observation of Surface Alfvén Waves in an ICME Flux Rope

Raghav

Omkar

Shaikh

et al. 2023

ApJ

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Alfvén waves (AWs) are ubiquitous in space and astrophysical plasma. Their crucial role in various physical processes has triggered intense research in solar–terrestrial physics. Simulation studies have proposed the generation of AWs along the surface of a cylindrical flux rope, referred to as surface AWs (SAWs); however, the observational verification of this distinct wave has been elusive to date. We report the first in situ observation of SAWs in a flux rope of an interplanetary coronal mass ejection. We apply the Walén test to identify them. We have used Elsässer variables to estimate the characteristics of SAWs. They may be excited by the movement of the flux rope’s footpoints or by instabilities along the boundaries of the plasma magnetic cloud. Here, the change in plasma density or field strength in the surface-aligned magnetic field may trigger SAWs.

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