Fluid Velocity Mapping and Flare Energetics in Solar Coronal Holes via Space-Based Extreme Ultraviolet Diagnostics

International Journal of Physics | Vol. 9, No. 1, January 2018 | pp. 1–8

DOI: 10.46882/2018/IJP/000093

Research Article

Title: Fluid Velocity Mapping and Flare Energetics in Solar Coronal Holes via Space-Based Extreme Ultraviolet Diagnostics

Names of Authors: G. R. Davies¹, A. M. El-Chemali²

Authors’ Affiliations: ¹School of Physics and Astronomy, University of St Andrews, St Andrews, UK; ²Department of Physics, Faculty of Science, Lebanese University, Beirut, Lebanon

Abstract: Magnetic reconnection is the primary physical process driving explosive energy releases in solar atmospheric plasma, heating material to millions of Kelvin and accelerating the fast solar wind. This paper evaluates fluid velocity mapping and quantifies local magnetic reconnection rates within an active coronal hole boundary region. We utilized high-resolution spectroscopic data from space-based extreme ultraviolet (EUV) channels tracking highly ionized iron lines (Fe XII and Fe XV). Differential affine velocity estimator algorithms were deployed to construct two-dimensional velocity fields of plasma inflows and outflows surrounding the current sheet layer. The empirical measurements reveal systematic plasma inflows moving at 20.5 km/s, while directed outflows reach velocities of 340.0 km/s along the magnetic open field corridors. Based on these transport metrics, the local dimensionless reconnection rate was calculated to range between 0.06 and 0.09. These values closely match fast reconnection regimes predicted by the Petschek theoretical framework modified by localized turbulent transport. Spectroscopic line-broadening analysis indicates localized turbulent temperatures peaking at 8.8 MK within the diffusion region, confirming intense localized viscous dissipation. These imaging diagnostics provide direct observational parameters for refining magnetohydrodynamic models of high-speed solar wind acceleration.

Keywords: Solar corona; coronal holes; magnetic reconnection; plasma dynamics; solar wind; extreme ultraviolet

Manuscript Timeline: Received: October 12, 2017; Revised: November 24, 2017; Accepted: December 15, 2017; Published: January 15, 2018

Citation: Davies, G. R., & El-Chemali, A. M. (2018). Fluid Velocity Mapping and Flare Energetics in Solar Coronal Holes via Space-Based Extreme Ultraviolet Diagnostics. International Journal of Physics, 9(1), 1–8.

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