Testing a Data-driven Active Region Evolution Model with Boundary Data at Different Heights from a Solar Magnetic Flux Emergence Simulation
arXiv:2010.02497 · doi:10.3847/1538-4357/abb5ac
Abstract
A data-driven active region evolution (DARE) model has been developed to study the complex structures and dynamics of solar coronal magnetic fields. The model is configured with typical coronal environment of tenuous gas governed by strong magnetic field, and thus its lower boundary is set at the base of the corona, but driven by magnetic fields observed in the photosphere. A previous assessment of the model using data from a flux emergence simulation (FES) showed that the DARE failed to reproduce the coronal magnetic field in the FES, which is attributed to the fact that the photospheric data in the FES has a very strong Lorentz force and therefore spurious flows are generated in the DARE model. Here we further test the DARE by using three sets of data from the FES sliced at incremental heights, which correspond to the photosphere, the chromosphere and the base of the corona. It is found that the key difference in the three sets of data is the extent of the Lorentz force, which makes the data-driven model perform very differently. At the two higher levels above the photosphere, the Lorentz force decreases substantially, and the DARE model attains results in much better agreement with the FES, confirming that the Lorentz force in the boundary data is a key issue affecting the results of the DARE model. However, unlike the FES data, the photospheric field from SDO/HMI observations has recently been found to be very close to force-free. Therefore, we suggest that it is still reasonable to use the photospheric magnetic field as approximation of the field at the coronal base to drive the DARE model.
10 pages, 5 figures, accept by ApJ
References in corpus (13)
- Optimization code with weighting function for the reconstruction of coronal magnetic fields
- Flare-productive active regions
- How did a Major Confined Flare Occur in Super Solar Active Region 12192?
- Magnetohydrodynamic Simulation of the X2.2 Solar Flare on 2011 February 15: I. Comparison with the Observations
- Numerical Simulations of Flare-productive Active Regions: delta-sunspots, Sheared Polarity Inversion Lines, Energy Storage, and Predictions
- Solar Magnetic Flux Rope Eruption Simulated by a Data-Driven Magnetohydrodynamic Model
- On rising magnetic flux tube and formation of sunspots in a deep domain
- Spontaneous Generation of delta-sunspots in Convective Magnetohydrodynamic Simulation of Magnetic Flux Emergence
- Comparative Study of Data-driven Solar Coronal Field Models Using a Flux Emergence Simulation as a Ground-truth Data Set
- Data-driven MHD Simulation of the Formation and Initiation of a Large-scale Pre-flare Magnetic Flux Rope in Solar Active Region 12371
- Chromospheric magnetic field: A comparison of He I 10830 A observations with nonlinear force-free field extrapolation
- On the Lorentz Force and Torque of Solar Photospheric Emerging Magnetic Fields
- A Research on the Force-Freeness of Photosphere Magnetic Field