研究目的
To characterize daytime wind profiles using an improved method based on SLODAR for adaptive optics systems, addressing difficulties in isolating cross-correlation peaks in 2D maps.
研究成果
The proposed method accurately recovers wind profiles in simulations and experimental data, showing improved performance over traditional methods, especially for weak or multiple peaks. Wind speeds were low (2.92 to 9.55 m/s) in the observed data, likely due to telescope operational constraints.
研究不足
The method relies on the frozen-flow hypothesis, which assumes constant wind speed on short time-scales; it may not perform well under highly variable conditions. The experimental data were recorded under good seeing conditions with low wind speed, limiting generalizability to high wind scenarios.
1:Experimental Design and Method Selection:
The method involves tracing cross-correlation peaks in 1D slices of spatio-temporal cross-correlation maps from different directions, based on the frozen-flow hypothesis and SLODAR extension. Simulations and experimental data from the 1-m New Vacuum Solar Telescope are used.
2:Sample Selection and Data Sources:
47 data sequences of solar images recorded at Fuxian Solar Observatory on 2017 October 5, using a wide-field Shack-Hartmann wavefront sensor.
3:List of Experimental Equipment and Materials:
Wide-field Shack-Hartmann wavefront sensor, 1-m New Vacuum Solar Telescope, ground-layer adaptive optics prototype system.
4:Experimental Procedures and Operational Workflow:
Slope processing including calibration, cross-correlation for slope measurement, removal of common motions and static errors; wind profiling by analyzing time-delayed cross-correlation peaks in 1D slices.
5:Data Analysis Methods:
Use of Fourier transforms for deconvolution, averaging over peaks for wind speed calculation, and comparison with traditional methods.
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