研究目的
To investigate the observational characteristics, dynamics, and physical parameters of magnetic loops above a flux-emerging region in its late phase using multiwavelength data from IRIS, Hinode, and SDO.
研究成果
The observations reveal that flux emergence in its late phase differs significantly from the early stage, with systematic blueshifts in the transition region and redshifts in the corona. The loop system consists of threads with narrow temperature ranges, and heating likely occurs after the loops reach the transition region or lower corona. The study provides insights into the dynamics and heating processes of magnetic loops, suggesting impulsive heating and the need for further investigation with higher-cadence data.
研究不足
The study is limited by the spatial and temporal resolution of the instruments, potential blending issues in spectral lines (e.g., Fe XII 195.1 ?), uncertainties in wavelength calibration for EIS data, and the challenge of background subtraction in DEM analysis. The observations focus on a specific time period and region, which may not be generalizable.
1：Experimental Design and Method Selection:
The study uses multiwavelength imaging and spectroscopic data from IRIS, Hinode/EIS, Hinode/XRT, SDO/AIA, and SDO/HMI to observe magnetic loops. Data were acquired during an observing campaign on 2017 August 26. Standard data reduction procedures and coalignment techniques were applied. Gaussian fitting was used for spectral line analysis, and differential emission measurement (DEM) techniques were employed for temperature profiling.
2：Standard data reduction procedures and coalignment techniques were applied. Gaussian fitting was used for spectral line analysis, and differential emission measurement (DEM) techniques were employed for temperature profiling.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The region of interest is part of active region NOAA AR12672, observed from 18:00 UT to 19:27 UT. Data include raster scans and images from the specified instruments.
3：List of Experimental Equipment and Materials:
Instruments used are IRIS spectrograph and slit-jaw imager, Hinode/EIS spectrometer, Hinode/XRT telescope, SDO/AIA imager, and SDO/HMI magnetograph. Specific spectral lines and passbands are listed in Tables 1 and 2 of the paper.
4：Experimental Procedures and Operational Workflow:
Data were prepared with standard procedures, coaligned using cross-correlations with HMI magnetograms as reference. Spectroscopic data were analyzed for Doppler velocities, nonthermal velocities, electron densities, and temperatures using Gaussian fits and DEM techniques. Imaging data were used to trace loop structures and evolution.
5：Data Analysis Methods:
Doppler velocities were derived from line center shifts, nonthermal velocities from line widths, electron densities from intensity ratios of specific line pairs (e.g., Fe XII λλ186.9/195.1), and temperatures from DEM analysis using CHIANTI atomic database.
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