Fluid Inflow Velocity Mapping and Flare Dynamics in the Solar Atmosphere via High-Resolution Ultraviolet Spectroscopy

International Journal of Physics | Vol. 6, No. 8, August 2015 | pp. 57–64

DOI: 10.46882/2015/IJP/000064

Research Article

Title: Fluid Inflow Velocity Mapping and Flare Dynamics in the Solar Atmosphere via High-Resolution Ultraviolet Spectroscopy

Names of Authors: G. R. Davies¹, A. L. Mendoza²

Authors’ Affiliations: ¹School of Physics and Astronomy, University of St Andrews, St Andrews, UK; ²Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Mexico City, Mexico

Abstract: Magnetic reconnection is the fundamental plasma driver behind explosive energy release events in the solar atmosphere, accelerating solar winds and triggering coronal mass ejections. This paper maps fluid inflow velocities and analyzes flare dynamics within a solar active region using high-resolution data from satellite ultraviolet spectrometers. We tracked the Doppler shifts and intensity profiles of the Si IV and Fe XXI spectral emission lines to isolate reconnection pathways. The empirical measurements reveal localized plasma inflows moving at 22.4 km/s, while directed outflows reach velocities of 310.0 km/s into the coronal loops. Based on these transport metrics, the local dimensionless reconnection rate was calculated to range between 0.06 and 0.09. These values closely align with fast reconnection regimes predicted by the Sweet-Parker theoretical framework modified by plasmoid instabilities. Spectroscopic line-broadening analysis indicates localized turbulent temperatures peaking at 12.5 MK within the current sheet boundary. This high temperature confirms intense localized viscous dissipation. These spectroscopic diagnostics provide direct observational constraints for refining magnetohydrodynamic models of solar coronal heating mechanisms.

Keywords: Solar atmosphere; magnetic reconnection; solar flares; ultraviolet spectroscopy; plasma velocity; magnetohydrodynamics

Manuscript Timeline: Received: April 15, 2015; Revised: June 02, 2015; Accepted: June 22, 2015; Published: August 19, 2015

Citation: Davies, G. R., & Mendoza, A. L. (2015). Fluid Inflow Velocity Mapping and Flare Dynamics in the Solar Atmosphere via High-Resolution Ultraviolet Spectroscopy. International Journal of Physics, 6(8), 57–64.

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