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Title: | Turbulence and Anomalous Resistivity inside Near-Earth Magnetic Clouds |
Authors: | BHATTACHARJEE, DEBESH SUBRAMANIAN, PRASAD Nieves-Chinchilla, Teresa Vourlidas, Angelos Dept. of Physics |
Keywords: | Turbulence, (magnetohydrodynamics) MHD Methods: statistical Sun: coronal mass ejections (CMEs) 2022-NOV-WEEK1 TOC-NOV-2022 2023 |
Issue Date: | Jan-2023 |
Publisher: | Oxford University Press |
Citation: | Monthly Notices of the Royal Astronomical Society, 518(1), 1185–1194. |
Abstract: | We use in-situ data from the Wind spacecraft to survey the amplitude of turbulent fluctuations in the proton density and total magnetic field inside a large sample of near-Earth magnetic clouds (MCs) associated with coronal mass ejections (CMEs) from the Sun. We find that the most probable value of the modulation index for proton density fluctuations (δnp/np) inside MCs ranges from 0.13 to 0.16, while the most probable values for the modulation index of the total magnetic field fluctuations (δB/B) range from 0.04 to 0.05. We also find that the most probable value of the Mach number fluctuations (δM) inside MCs is ≈0.1. The anomalous resistivity inside near-Earth MCs arising from electron scattering due to turbulent magnetic field fluctuations exceeds the (commonly used) Spitzer resistivity by a factor of ≈500 − 1000. The enhanced Joule heating arising from this anomalous resistivity could impact our understanding of the energetics of CME propagation. |
URI: | https://doi.org/10.1093/mnras/stac3186 http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/7451 |
ISSN: | 1365-2966 0035-8711 |
Appears in Collections: | JOURNAL ARTICLES |
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