Statistical and Observational Research of Solar Flare EUV Spectra and Geometrical Features for Predicting Total Flare Emission Spectra
Abstract
We are performing statistical analysis of observed flare emissions for making the total flare emission spectra prediction model. The Flare Irradiance Spectral Model (FISM) (Chamberlin et al. 2006, 2007, 2008) is one of the total flare spectra prediction model which is currently most widely used. However, since FISM is empirical model, there are problems such as the uncertain physical process. In order to solve FISM's problems, we are trying to make new prediction model of total flare spectra. For this purpose, we searched for which flare parameter affect to the flare emission. We used the soft X-ray data (intensity & duration) as fundamental parameter, and compared with EUV data observed by SDO/EVE MEGS-A statistically. We have 53 events which were MEGS-A observed with >M3 class flare, and especially analyzed for 6 EUV lines. We found the soft X-ray peak intensity was well correlated with EUV line peak intensity. The EUV rising time also well correlated with soft X-ray rising time, and hotter lines peaked earlier than cooler lines. Moreover, we also searched for the relationship with geometrical features (ribbon length & width) of solar flare observed by SDO/AIA 1600 Å for 32 events. We found the ribbon distance is related to the rising time of soft X-ray, and the ribbon length is related to the decay time of soft X-ray. From these results, we can say that the Fe line emissions can be explain by the soft X-ray emissions. Moreover, the soft X-ray light curve also can be estimated by the flare loop length. Then, we performed numerical simulations (Imada et al., 2015) using observational parameters obtained above results. In this paper, we show some results of numerical simulations, and will discuss which parameters strongly control the solar flare EUV emission spectra by comparing with observed data.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFMSH34A..04N
- Keywords:
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- 7519 Flares;
- SOLAR PHYSICS;
- ASTROPHYSICS;
- AND ASTRONOMY;
- 7524 Magnetic fields;
- SOLAR PHYSICS;
- ASTROPHYSICS;
- AND ASTRONOMY;
- 7924 Forecasting;
- SPACE WEATHER;
- 7959 Models;
- SPACE WEATHER