Publications that resulted from the work of the Team, as a whole or from collaborations between its members. An acknowledgment of the ISSI support is included.

• Testing magnetic helicity conservation in a solar-like active event E. Pariat, G. Valori, P. Démoulin, K. Dalmasse published in Solar Physics (DOI: 10.1051/0004-6361/201525811 )
• Magneto-Frictional Modeling of Coronal Nonlinear Force-Free Fields: I. Testing with Analytic Solutions Y. Guo, C. Xia, R. Keppens, G. Valori published in ApJ (DOI: 10.3847/0004-637X/828/2/83)
• Magnetic helicity estimations in models and observations of the solar magnetic field. Part I: Finite volume methods Gherardo Valori, Etienne Pariat, Sergey Anfinogentov, Feng Chen, Manolis K. Georgoulis, Yang Guo, Yang Liu, Kostas Moraitis, Julia K. Thalmann, Shangbin Yang, published in Space Science review ( DOI: 10.1007/s11214-016-0299-3)
• Magnetic Helicity Estimations in Models and Observations of the Solar Magnetic Field. Part III: Twist Number Method Yang Guo, Etienne Pariat, Gherardo Valori, Sergey Anfinogentov, Feng Chen, Manolis K. Georgoulis, Yang Liu, Kostas Moraitis, Julia K. Thalmann, Shangbin Yang, published in ApJ (DOI : 10.3847/1538-4357/aa6aa8)
• Relative magnetic helicity as a diagnostic of solar eruptivity Etienne Pariat, James E. Leake, Gherardo Valori, Mark G. Linton, Francesco P. Zuccarello, Kevin Dalmasse, published in A&A (DOI : 10.1051/0004-6361/201630043)
• On flare-CME characteristics from Sun to Earth combining remote-sensing image data with in-situ measurements supported by modeling M. Temmer, J.K. Thalmann, K. Dissauer, A.M. Veronig, J. Tschernitz, J. Hinterreiter, L. Rodriguez published in Solar Physics (DOI: 10.1007/s11207-017-1112-5)
• Algorithms of the Potential Field Calculation in a Three Dimensional Box G.V. Rudenko, S.A. Anfinogentov published in Solar Physics (DOI: 10.1007/s11207-017-1126-z)
• Relative field-line helicity in bounded domains Yeates, A. R.; Page, M. H., to be published in J. Plasma Phys (eprint arXiv:1811.02306)

 

Test cases used in the Finite-Volume article: Magnetic helicity estimations in models and observations of the solar magnetic field. Part I: Finite volume methods

The results summarized in the paper are available as ASCII format.

Low and Lou

Usual case of the Low&lou FF solution with n=1, l=0.3, phi=pi/4 in [-1,1]x[-1,1]x[0,2] discretized with NxNxN nodes, for the following

• N= 32 LL_case_I_n32.sav (~ 800 kB)
• N= 64 LL_case_I_n64.sav (~ 6 MB)
• N=128 LL_case_I_n128.sav (~ 49 MB)
• N=256 LL_case_I_n256.sav (~ 384 MB)

In all cases, the same solution of the ODE was used, which was obtaibned using 320 nodes.

Titov and Démoulin

See Section 4.1 of Valori et al 2012 and references therein for details. The six tests cases can be downladed from this page, together with a brief readme file.

MHD simulation by J.Leake

Here are the reference articles for the stable and ustable cases. For this series of tests, both fluxes (at top and bottom boundaries) and volume tests are available:

• Stable case fluxes, and the associated readme file
• Stable case volume snaphsohts, and the associated readme file
• Unstable case fluxes , and the associated readme file
• Unstable case volume snaphsohts, and the associated readme file

Test on divB In order to study the effect of divergence, six model fields are constructed using one of James Leake's simulation output, namely the t=50 of the stable simulation. The model fields have increasing divergence, from about 0.1% to 10% of the total energy, and can be downloaded from this page.

Created, 1 Nov. 2014 by G. Valori