研究目的
To perform a detailed statistical analysis of the spectral Lyman-line observations of the quiescent prominence observed on May 18, 2005, and investigate the plasma properties of the prominence by comparing synthetic and observed line profiles.
研究成果
The multi-thread model with identical threads is sufficient for a statistical comparison of observed and synthetic data, but none of the multi-thread models with non-identical threads was able to reproduce the double-peak histogram of the observed Lyα integrated intensities. The temperature in the interiors of cool prominence fine structures in the studied prominence is about 8000 K and does not vary significantly among individual structures.
研究不足
The study acknowledges that the mutual radiative interaction between individual threads was neglected, which might explain some discrepancies in the histograms of the Lyα and Lyβ centre-to-peak ratio. Additionally, the temporal changes of the prominence structure during the observations could not be the cause of the double-peak distribution of the observed Lyα integrated intensities.
1：Experimental Design and Method Selection:
The study used a profile-to-profile comparison of synthetic Lyman spectra obtained by 2D single-thread prominence fine-structure models and employed 2D multi-thread fine-structure models with random positions and line-of-sight velocities of each thread.
2：Sample Selection and Data Sources:
The quiescent prominence observed on May 18, 2005, by the SoHO/SUMER spectrograph was analyzed.
3：List of Experimental Equipment and Materials:
The Solar Ultraviolet Measurements of Emitted Radiation (SUMER) UV-spectrograph onboard the Solar and Heliospheric Observatory (SoHO) satellite was used.
4：Experimental Procedures and Operational Workflow:
The observed spectra were reduced and calibrated using standard SolarSoft procedures. The spectral lines were identified using the SUMER spectral atlas.
5：Data Analysis Methods:
The study compared the histograms of three statistical parameters (integrated intensity, Lyman decrement ratio, and the ratio of intensity at the central reversal to the average intensity of peaks) characterizing the properties of the synthetic and observed line profiles.
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