Does the Alfvén wave disrupt the large-scale magnetic cloud structure?
arXiv:1810.06009 · doi:10.1093/mnrasl/sly106
Abstract
Alfvén waves are primal and pervasive in space plasmas and significantly contributes to microscale fluctuations in the solar wind and some heliospheric processes. Here, we demonstrate the first observable distinct feature of Alfvén wave while propagating from magnetic cloud to trailing solar wind. The Walén test is used to confirm their presence in selected regions. The amplitude ratio of inward to outward Alfvén waves is employed to establish their flow direction. The dominant inward flow is observed in magnetic cloud whereas trailing solar wind shows the dominant outward flow of Alfvén waves. The observed reduction in Walén slope and correlation coefficient within magnetic cloud suggest (i) the simultaneous presence of an inward & outward Alfvén waves and/or (ii) a possibility of magnetic reconnection and/or (iii) development of thermal anisotropy and/or (iv) dissipation of Alfvénic fluctuations. The study implies that either the Alfvén waves dissipate in the magnetic cloud or its presence can lead to disruption of the magnetic cloud structure.
References in corpus (10)
- Spectrum of magnetohydrodynamic turbulence
- Turbulence and Particle Heating in Advection-Dominated Accretion Flows
- Asymmetry in the CME-CME interaction process for the events from 2011 February 14-15
- A stringent limit on the amplitude of Alfvénic perturbations in high-beta low-collisionality plasmas
- Morphological and Kinematic Evolution of Three Interacting Coronal Mass Ejections of 2011 February 13-15
- Amplitude limits and nonlinear damping of shear-Alfvén waves in high-beta low-collisionality plasmas
- Does Local Structure Within Shock-sheath and Magnetic Cloud Affect Cosmic Ray Decrease?
- Understanding Forbush decrease drivers based on shock-only and CME-only models using global signature of February 14, 1978 event
- The first in-situ observation of torsional Alfven waves during the interaction of large-scale magnetic clouds
- Pressure anisotropy generation in a magnetized plasma configuration with a shear flow velocity