Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...732...19w&link_type=abstract
The Astrophysical Journal, Volume 732, Issue 1, article id. 19 (2011).
Astronomy and Astrophysics
Astronomy
2
Magnetohydrodynamics: Mhd, Solar Wind, Sun: Corona, Sun: Magnetic Topology, Sun: Photosphere
Scientific paper
Magnetic field measurements, line of sight (LOS) and/or vector magnetograms, have been used in a variety of solar physics studies. Currently, the global transverse velocity measurements near the photosphere from the Global Oscillation Network Group (GONG) are available. We have utilized these multiple observational data, for the first time, to present a data-driven global three-dimensional and resistive magnetohydrodynamic (MHD) simulation, and to investigate the energy transport across the photosphere to the corona. The measurements of the LOS magnetic field and transverse velocity reflect the effects of convective zone dynamics and provide information from the sub-photosphere to the corona. In order to self-consistently include the observables on the lower boundary as the inputs to drive the model, a set of time-dependent boundary conditions is derived by using the method of characteristics. We selected GONG's global transverse velocity measurements of synoptic chart CR2009 near the photosphere and SOLIS full-resolution LOS magnetic field maps of synoptic chart CR2009 on the photosphere to simulate the equilibrium state and compute the energy transport across the photosphere. To show the advantage of using both observed magnetic field and transverse velocity data, we have studied two cases: (1) with the inputs of the LOS magnetic field and transverse velocity measurements, and (2) with the input of the LOS magnetic field and without the input of transverse velocity measurements. For these two cases, the simulation results presented here are a three-dimensional coronal magnetic field configuration, density distributions on the photosphere and at 1.5 solar radii, and the solar wind in the corona. The deduced physical characteristics are the total current helicity and the synthetic emission. By comparing all the physical parameters of case 1 and case 2 and their synthetic emission images with the EIT image, we find that using both the measured magnetic field and the velocity distribution would give more cohesive results.
Hill F. F.
Tandberg-Hanssen Einar
Wang Ai-Hua
Wu Shi Tsan
No associations
LandOfFree
Utilization of Multiple Measurements for Global Three-dimensional Magnetohydrodynamic Simulations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Utilization of Multiple Measurements for Global Three-dimensional Magnetohydrodynamic Simulations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Utilization of Multiple Measurements for Global Three-dimensional Magnetohydrodynamic Simulations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1747561