MHD Simulation of the Solar Corona Driven by the Time-Varying Solar-Surface Boundary Magnetic Field Based on The SOHO/MDI Measurement Data

Details MHD Simulation of the Solar Corona Driven by the Time-Varying Solar-Surface Boundary Magnetic Field Based on The SOHO/MDI Measurement Data MHD Simulation of the Solar Corona Driven by the Time-Varying Solar-Surface Boundary Magnetic Field Based on The SOHO/MDI Measurement Data

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.1606h&link_type=abstract

American Astronomical Society, SPD meeting #40, #16.06; Bulletin of the American Astronomical Society, Vol. 41, p.840

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We will show our new real-time MHD simulation effort that produces the time-dependent responses of the global corona to the time-varying surface magnetic field based upon the daily measurement. We used the SOHO/MDI magnetograph data. We have been conducting the daily time-relaxation MHD simulation to obtain the quasi-steady state of the solar corona by using the same dataset, and the simulation result, the numerically quasi-steady state of the quiet corona, is shown in our website and updated on daily basis.
Our new effort to be presented is an extended version of this daily MHD simulation: The boundary treatment can handle the time-varying radial component of magnetic field (Br) in conjunction with the concept of characteristics in hyperbolic MHD system. The temporal evolution of the solar corona during a 24-hour period from (N-1)th to Nth day is computationally reproduced with the time-dependent MHD simulation using two magnetograph maps (for day N-1 and N) and starting with the latest state for day N-1. By doing the simulation on daily basis, we now can trace the continuous evolution and topological changes of the large-scale coronal structures.
The daily real-time simulation and the test runs using the data in the past will be presented.

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