Footpoint versus loop-top hard X-ray emission sources in solar flares

Abstract

The hard X-ray flux ratio R of the footpoint sources to the loop-top source has been used to investigate non-thermal electron trapping and precipitation in solar flares. Considering the mission-long Yohkoh Hard X-ray Telescope database, from which we selected 117 flares, we investigated a dependence of the ratio R on flare loop parameters like height h and column depth N. We used non-thermal electron beams as a diagnostic tool for magnetic convergence. The ratio R decreases with h which we interpret as an effect of converging field geometry. Two branches seen in the R-h diagram suggest that in the solar corona two kinds of magnetic loops can exist: a more-converged ones that are more frequent (above 80%) and less-converged loops that are less frequent (below 20%). A lack of correlation between the ratio R and N can be due to a more complex configuration of investigated events than seen in soft X-rays. Obtained values of the magnetic mirror ratio are consistent with previous works and suggest a strongly nonpotential configuration. Further investigation including RHESSI data is needed to verify our results.

12 pages, 6 figures, to be published in A&A

References in corpus (3)

• Looptop Hard X-Ray Emission in Solar Flares: Images and Statistics
• The Magnetic Structure of Coronal Loops Observed by TRACE
• On the Spatial Distribution of Hard X-Rays from Solar Flare Loops

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• On the variation of solar flare coronal x-ray source sizes with energy
• Suppression of parallel transport in turbulent magnetized plasmas and its impact on non-thermal and thermal aspects of solar flares
• MHD turbulence formation in solar flares: 3D simulation and synthetic observations
• Diffusive Transport of Energetic Electrons in the Solar Corona: X-ray and Radio Diagnostics
• YOHKOH remnants: partially occulted flares in hard X-rays
• Coronal Electron Confinement by Double Layers
• Investigation of quasi-periodic variations in hard X-rays of solar flares. II. Further investigation of oscillating magnetic traps
• Solar Burst Analysis with 3D Loop Models