An approximate recipe of chromospheric radiative losses for solar flares

Abstract

Radiative losses in the chromosphere are very important in the energy balance. There have been efforts to make simple lookup tables for chromospheric radiative losses in the quiet Sun. During solar flares, the atmospheric conditions are quite different, and the currently available recipe of Gan & Fang (1990) is constructed from semi-empirical models. It remains to be evaluated how these recipes work in flare conditions. We aim to construct an approximate recipe of chromospheric radiative losses for solar flares. We follow the method of Carlsson & Leenaarts (2012) to tabulate the optically thin radiative loss, escape probability, and ionization fraction, while using a grid of flare models from radiative hydrodynamic simulations as our dataset. We provide new lookup tables to calculate chromospheric radiative losses for flares. Compared with previous recipes, our recipe provides a better approximation to the detailed radiative losses for flares.

arXiv comment7 pages, 6 figures, 2 tables. A&A accepted. The lookup tables of the fitted curves are available in http://sdc.nju.edu.cn/d/8f8ef25c91684926ae3c

References in corpus (20)

• The stellar atmosphere simulation code Bifrost
• CHIANTI -- an atomic database for emission lines -- Paper XVI: Version 10, further extensions
• Radiative Hydrodynamic Models of the Optical and Ultraviolet Emission from Solar Flares
• Does a Non-Magnetic Solar Chromosphere Exist?
• The formation of the Halpha line in the solar chromosphere
• Dynamic Hydrogen Ionization
• A Unified Computational Model for Solar and Stellar Flares
• Approximations for radiative cooling and heating in the solar chromosphere
• The formation of IRIS diagnostics I. A quintessential model atom of Mg II and general formation properties of the Mg II h&k lines
• The influence of numerical resolution on coronal density in hydrodynamic models of impulsive heating
• RH 1.5D: a massively parallel code for multi-level radiative transfer with partial frequency redistribution and Zeeman polarisation
• The Atmospheric Response to High Nonthermal Electron Beam Fluxes in Solar Flares I: Modeling the Brightest NUV Footpoints in the X1 Solar Flare of 2014 March 29
• Spectral signatures of chromospheric condensation in a major solar flare
• Detailed and simplified non-equilibrium helium ionization in the solar atmosphere
• Investigating the response of loop plasma to nanoflare heating using RADYN simulations
• He I 10830 Å Dimming During Solar Flares, I. The Crucial Role of Non-Thermal Collisional Ionisations
• Solar Flare Arcade Modelling: Bridging the gap from 1D to 3D Simulations of Optically Thin Radiation
• Simulation of Alfven wave propagation in magnetic chromosphere with radiative loss: effects of non-linear mode coupling on chromospheric heating
• Hydrogen Emission in Type II White-light Solar Flares
• Chromospheric Bubbles in Solar Flares

Cited by in corpus (5)

• Data-Driven Radiative Magnetohydrodynamics Simulations with the MURaM code
• Winking filaments due to cyclic evaporation-condensation
• Radiative losses in the chromosphere during a C-class flare
• Evaluation of different recipes for chromospheric radiative losses in solar flares
• On the intensity ratio variation of the Si IV 1394/1403 Å lines during solar flares