| Project |
| Acronym: |
|
| Name: |
Development of a Data-driven Three-Dimensional Magnetohydrodynamic Model
|
| Project status: |
From: 2007-10-01
To: 2010-09-31
(Completed)
|
| Contract number: |
|
| Action line: |
|
| Type (Programme): |
MULTILAT |
| Instrument: |
Ostalo |
| Project cost: |
- |
| Project funding: |
- |
| Project coordinator |
| Organisation Name: |
The University of Alabama in Hunstville, CSPAR |
| Organisation adress: |
Huntsville, Alabama AL 35899 |
| Organisation country: |
Sjedinjene američke države |
| Contact person name: |
Prof. S.T. Wu |
| Contact person email: |
Email |
| Croatian partner |
| Organisation name: |
Geodetski fakultet |
| Organisation address: |
Kačićeva 26, 10000 Zagreb |
| Contact person name: |
Bojan Vršnak
|
| Contact person tel: |
| +385 1 4639 279 |
Contact person fax: |
+385 1 4828 081 |
|
| Contact person e-mail: |
Email |
| Partners |
| Organisation name | Country |
| Astronomical Institute of the Slovak Accad. Sci. | Slovačka |
|
| Short description of project |
| A three-year research program is proposed to develop a data-driven 3D magnetohydrodynamic (MHD) model with radiation effects (i.e. radiation MHD) to investigate the sources and origins of solar eruptions. This proposed 3D radiation MHD model grew from our recent work of data-driven 3D MHD active region evolution model (Wu et al. 2006). Our model has shown promise in simulating the non-potential field properties (Falconer et al. 2002; Wu et al. 2006) which can be used as a prediction scheme for the initiation of solar eruptions. However, the current model (Wu et al. 2006) does not include the radiation and transition region effects, thus it does not simulate the emission measure well; therefore, the development of a radiation MHD model is proposed. In order to include radiation effects into our present data-driven 3D MHD model the momentum and energy equations will be modified according to the theory given by Mihalas and Mihalas (1984) so that Uitenbroek’s numerical code (RHSC 3D) which calculates radiation flux will be incorporated into the proposed data-driven radiation MHD model in a self-consistent manner. To include the transition region of the solar atmosphere, the transition region model developed by Wu et al. (2005a) will be incorporated into the to-be-developed data driven radiation MHD (RMHD) model as the initial background solar atmosphere. |
| Short description of the task performed by Croatian partner |
| An important innovation in using this to-be-developed data-driven RMHD model to study the initiation of solar eruptions is it’s ability to incorporate realistic photosphereic dynamics by inputting available photospheric measurements. Thus, the effects caused by sub-photospheric dynamics (i.e. convective zone dynamics) can be partially reflected through surface boundary conditions. Another distinct aspect is to use a new numerical method, named Flowfield-Dependent Variable (FDV) method to construct this RMHD model. The FDV method has not been applied to electromagnetic (EM) computation, but it has been proven to be a very robust method for ordinary fluid dynamics (Chung, 1999) and relativistic astrophysics (Richardson and Chung, 2002). The ability of the FDV method to handle flow problems with complex physical phenomena over vast scales is ideal for this application. A distinctive aspect of the proposed research is to investigate the active region evolution that triggers solar eruptive events using available photopheric measurements. On the basis of our analyses, we will be able to investigate the factors intertwining relationships for the understanding of the initiation and origin of solar eruptions. |
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