Time variations of observed H$\alpha$ line profiles and precipitation depths of non-thermal electrons in a solar flare

Abstract

We compare time variations of the H$\alpha$ and X-ray emissions observed during the pre-impulsive and impulsive phases of the C1.1-class solar flare on 21 June 2013 with those of plasma parameters and synthesized X-ray emission from a one-dimensional hydro-dynamic numerical model of the flare. The numerical model was calculated assuming that the external energy is delivered to the flaring loop by non-thermal electrons. The H$\alpha$ spectra and images were obtained using the Multi-channel Subtractive Double Pass spectrograph with a time resolution of 50~ms. The X-ray fluxes and spectra were recorded by the Reuven Ramaty High-Energy Solar Spectroscopic Imager (RHESSI). Pre-flare geometric and thermodynamic parameters of the model and the delivered energy were estimated using RHESSI data. The time variations of the X-ray light curves in various energy bands and the those of the H$\alpha$ intensities and line profiles were well correlated. The time scales of the observed variations agree with the calculated variations of the plasma parameters in the flaring loop footpoints, reflecting the time variations of the vertical extent of the energy deposition layer. Our result shows that the fast time variations of the H$\alpha$ emission of the flaring kernels can be explained by momentary changes of the deposited energy flux and the variations of the penetration depths of the non-thermal electrons.

31 pages, 13 figures, accepted to ApJ

References in corpus (8)

• Highly Efficient Modeling of Dynamic Coronal Loops
• RHESSI Microflare Statistics II. X-ray Imaging, Spectroscopy & Energy Distributions
• The spectral evolution of impulsive solar X-ray flares
• Combined Modeling of Acceleration, Transport, and Hydrodynamic Response in Solar Flares: I. The Numerical Model
• Relationship between non-thermal electron energy spectra and GOES classes
• Plasma heating in the very early and decay phases of solar flares
• Plasma heating in solar flares and their soft and hard X-ray emissions
• Variations of flaring kernel sizes in various parts of the H-alpha line profile

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