Simulation of Spectral Observations of an Eruptive Prominence

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Geomagnetism and Aeronomy Pub Date : 2024-03-06 DOI:10.1134/S0016793223600881

Yu. A. Kupryakov, K. V. Bychkov, O. M. Belova, A. B. Gorshkov, P. Kotrč

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Abstract

The paper presents the results of an analysis of observations of an eruptive prominence on the MFS and HSFA2 spectrographs of the Ondřejov Observatory (Astronomical Institute, Czech Republic) in the hydrogen, helium, and calcium lines. After spectral processing, the integral radiation fluxes in the lines were determined and the physical parameters of the plasma were calculated theoretically using a model in the absence of local thermodynamic equilibrium. Comparison of the observed and calculated values showed that the observed radiation fluxes in the lines can be explained in a model of stationary gas radiation taking into account the opacity in the spectral lines. To calculate the theoretical fluxes, in some cases, it was necessary to introduce radiation from several layers with different temperatures and heights. The calculated radiation fluxes agree with the observed ones to within 10%. As a result of the simulation, the main parameters of the plasma of the prominence were obtained: temperature, concentration, etc. The values of the radiation fluxes in the spectral lines are evidence of inhomogeneity of the emitting gas, and there may be regions next to each other with temperatures differing by an order of magnitude.

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对爆发性突起的光谱观测模拟

摘要本文介绍了对 Ondřejov 天文台（捷克共和国天文研究所）的 MFS 和 HSFA2 摄谱仪在氢线、氦线和钙线上观测到的喷发性突出现象的分析结果。经过光谱处理后，确定了各条谱线中的积分辐射通量，并利用一个不存在局部热力学平衡的模型对等离子体的物理参数进行了理论计算。对观测值和计算值的比较表明，观测到的光谱线中的辐射通量可以用考虑到光谱线中不透明度的静止气体辐射模型来解释。为了计算理论通量，在某些情况下需要引入来自不同温度和高度的多个层的辐射。计算得出的辐射通量与观测到的通量吻合度在 10%以内。模拟结果得出了突出部等离子体的主要参数：温度、浓度等。光谱线中的辐射通量值证明了发射气体的不均匀性，相邻区域的温度可能相差一个数量级。

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来源期刊

Geomagnetism and Aeronomy Earth and Planetary Sciences-Space and Planetary Science

CiteScore

1.30

自引率

33.30%

发文量

审稿时长

4-8 weeks

期刊介绍： Geomagnetism and Aeronomy is a bimonthly periodical that covers the fields of interplanetary space; geoeffective solar events; the magnetosphere; the ionosphere; the upper and middle atmosphere; the action of solar variability and activity on atmospheric parameters and climate; the main magnetic field and its secular variations, excursion, and inversion; and other related topics.