First analysis of in-situ observation of surface Alfvén waves in ICME flux rope

• DOI: 10.48550/arxiv.2211.16972
• Publication Date: 2022-01-01
• Authors: Anil raghav; Omkar Dhamane; Zubair shaikh; Naba Azmi; Ankita Manjrekar; Utsav Panchal; Kalpesh Ghag; Daniele Telloni; R. D’Amicis; Prathmesh Tari; Akshata Gurav
• Keywords: Magnetic cloud

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