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A comprehensive three-dimensional radiative magnetohydrodynamic simulation of a solar flare
摘要： Solar and stellar flares are the most intense emitters of X-rays and extreme ultraviolet radiation in planetary systems. On the Sun, strong flares are usually found in newly emerging sunspot regions. The emergence of these magnetic sunspot groups leads to the accumulation of magnetic energy in the corona. When the magnetic field undergoes abrupt relaxation, the energy released powers coronal mass ejections as well as heating plasma to temperatures beyond tens of millions of kelvins. While recent work has shed light on how magnetic energy and twist accumulate in the corona and on how three-dimensional magnetic reconnection allows for rapid energy release, a self-consistent model capturing how such magnetic changes translate into observable diagnostics has remained elusive. Here, we present a comprehensive radiative magnetohydrodynamics simulation of a solar flare capturing the process from emergence to eruption. The simulation has sufficient realism for the synthesis of remote sensing measurements to compare with observations at visible, ultraviolet and X-ray wavelengths. This unifying model allows us to explain a number of well-known features of solar flares, including the time profile of the X-ray flux during flares, origin and temporal evolution of chromospheric evaporation and condensation, and sweeping of flare ribbons in the lower atmosphere. Furthermore, the model reproduces the apparent non-thermal shape of coronal X-ray spectra, which is the result of the superposition of multi-component super-hot plasmas up to and beyond 100 million K.
关键词： extreme ultraviolet radiation,solar flares,X-rays,magnetohydrodynamics,coronal mass ejections
更新于2025-09-09 09:28:46
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[ASME ASME 2014 Dynamic Systems and Control Conference - San Antonio, Texas, USA (Wednesday 22 October 2014)] Volume 1: Active Control of Aerospace Structure; Motion Control; Aerospace Control; Assistive Robotic Systems; Bio-Inspired Systems; Biomedical/Bioengineering Applications; Building Energy Systems; Condition Based Monitoring; Control Design for Drilling Automation; Control of Ground Vehicles, Manipulators, Mechatronic Systems; Controls for Manufacturing; Distributed Control; Dynamic Modeling for Vehicle Systems; Dynamics and Control of Mobile and Locomotion Robots; Electrochemical Energy Systems - Dynamic Analysis and Controller Design of the Balloon Point Control System of Gamma-Ray Imager/Polarimeter for Solar Flares
摘要： A pointing control system is developed for the Gamma-Ray Imager/Polarimeter for Solar ?ares (GRIPS) balloon-borne instrument which provides a near-optimal combination of high-resolution imaging, spectroscopy, and polarimetry of solar-?are gamma-ray/hard X-ray emissions from ～20 keV to ～10 MeV. Within the narrow ?eld of view of its sun sensor, the telescope must track the sun with a 0.5 degrees rms accuracy. This paper introduces the mechanical structure of the pointing control system and investigates the dynamics and control strategy and presents the simulation and experimental results.
关键词： hard X-ray,pointing control system,GRIPS,solar flares,gamma-ray,balloon-borne instrument
更新于2025-09-09 09:28:46