Abstract Details


Name: Jyoti Sheoran
Affiliation: Aryabhatta Research Institute of Observational Sciences (ARIES)
Conference ID: TVS202510193
Title: Turbulent Properties of Interplanetary Coronal Mass Ejections in the Inner Heliosphere
Authors and Co-Authors: Supratik Banerjee, Vaibhav Pant, Dipankar Banerjee
Abstract Type: Contributory Presentation
Abstract: We investigate the turbulent properties of interplanetary coronal mass ejections (ICMEs) observed by the Solar Orbiter spacecraft between 0.29 and 1.0 AU. Magnetic field power spectra and correlations between magnetic and velocity fluctuations are examined across the sheath, magnetic ejecta (ME), and adjacent solar wind regions. In the solar wind, non-Alfvénic intervals typically exhibit a single power-law spectrum with an f-5/3 scaling within the inertial range, whereas Alfvénic intervals display either (i) a single power-law close to f-3/2 or f-5/3, or (ii) a double power-law, with f-3/2 at lower frequencies and f-5/3 at higher frequencies. In contrast, ICME substructures (sheath and ME) consistently show a single power-law spectrum with Kolmogorov-like f-5/3 scaling at all heliocentric distances. Alfvénicity is systematically reduced inside ICMEs compared to the surrounding solar wind, with the lowest values in ME regions, suggesting more balanced Alfvénic fluctuations within ICMEs. Moreover, the spectral break between the inertial and dissipation ranges shifts to higher frequencies in ICME regions, with average break frequencies of 0.53 ± 0.35 Hz in the solar wind, 1.87 ± 1.46 Hz in sheaths, and 1.46 ± 1.28 Hz in MEs, indicating differences in the underlying microphysical scales of ICMEs and the solar wind. Our findings highlight distinct turbulence regimes in ICMEs compared to the solar wind and support the use of fluctuation power, spectral breaks, and velocity–magnetic field correlations as effective diagnostics for identifying ICME boundaries within the heliosphere.