'Force free' diaporamas de présentation

Extragalactic Magnetic Fields and Dynamo

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The Relation between Filament Skew Angle and Magnetic Helicity of Active Regions Masaoki HAGINO,

The first Chinese-Korean Solar Physics Workshop July 9-13,2005. The Relation between Filament Skew Angle and Magnetic Helicity of Active Regions Masaoki HAGINO, Y.J. MOON (Korea Astronomy and Space Science Institute) and Takashi SAKURAI (National Astronomical Observatory of Japan).

521 views • 40 slides

Solar magnetic fields: force-free fields

Solar magnetic fields: force-free fields . Anna ( Ania ) Malanushenko. Force-Free Fields. Know B in photosphere Want to know B in the corona. Force-free field: definition. Recall from the prev. lecture:. neglect in the corona. Equilibrium in the corona:. Recall:. Force-free field:.

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Extrapolation of magnetic fields

Extrapolation of magnetic fields. Thomas Wiegelmann. Why study coronal magnetic fields? How to obtain the coronal magnetic field vector? Linear and non-linear models. Computational implementation and tests. Recent problems and possible solutions.

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How to deal with measurement errors and missing data in NLFFF-modeling?

How to deal with measurement errors and missing data in NLFFF-modeling?. Hinode FOV. Conclusions from NLFFF-5. When presented with complete and consistent boundary conditions , NLFFF algorithms succeed in modeling test fields.

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Can we use nonlinear and selfconsistent models for data analysis?

Can we use nonlinear and selfconsistent models for data analysis?. Thomas Wiegelmann. We learned from Prof. Schindler about the importance of nonlinear and selfconsistent models.

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Reconnection in the Magnetotail and the Solar Corona

Reconnection in the Magnetotail and the Solar Corona. J. Birn, M. Hesse Ackn.: R. Nakamura, E. Panov. photo: M.Hesse. Reconnection in the Magnetotail and the Solar Corona. Overview Bouncing and vortex flows Role of entropy loss/reduction Energetic particle fluxes (test electrons)

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Incorporating Magnetogram Data into Time-Dependent Coronal Field Models

Incorporating Magnetogram Data into Time-Dependent Coronal Field Models.

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Nonlinearity of the force-free parameter over active regions.

Helicity think shop @ Beijing, China, Oct-2009. Nonlinearity of the force-free parameter over active regions. M.Hagino and T.Sakurai National Astronomical Observatory of Japan, Solar Observatory. Helicity think shop @ Beijing, China, Oct-2009. Contents.

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Nonlinearity of the force-free parameter over active regions.

Helicity think shop @ Beijing, China, Oct-2009. Nonlinearity of the force-free parameter over active regions. M.Hagino and T.Sakurai National Astronomical Observatory of Japan, Solar Observatory. Helicity think shop @ Beijing, China, Oct-2009. Contents.

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Looking to the Future Where are we going with Force-Free?

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Mei Zhang ? National Astronomical Observatory of China ?

Coronal Mass Ejection As a Result of Magnetic Helicity Accumulation. Mei Zhang ? National Astronomical Observatory of China ?. Collaborators : BC Low (HAO/NCAR) Natasha Flyer (SCD/NCAR). References : Zhang, Flyer & Low 2006, ApJ, 644, 575 Zhang & Flyer 2008, ApJ, 683, 1160.

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Preprocessing of Vector Magnetograms for Extrapolation of Coronal Magnetic Fields

Preprocessing of Vector Magnetograms for Extrapolation of Coronal Magnetic Fields. General Discussion. Assumption: force-free: ? with Force-free condition holds above 400km

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Current-Driven Kink Instability in Magnetically Dominated Rotating Relativistic Jets

Current-Driven Kink Instability in Magnetically Dominated Rotating Relativistic Jets. Yosuke Mizuno Institute of Astronomy National Tsing-Hua University Collaborators Y. Lyubarsky (Ben-Gurion Univ), P. E. Hardee (Univ. of Alabama), K.-I. Nishikawa (NSSTC/ Univ. of Alabama in Huntsville).

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Coronal magnetic field models Nonlinear Force-Free Fields (NLFFF)

Nonlinear force-free extrapolation of coronal magnetic fields T. Wiegelmann, J.K. Thalmann, B. Inhester. Coronal magnetic field models Nonlinear Force-Free Fields (NLFFF) Consistency criteria for vector magnetograms and preprocessing Evolution of a flaring Active Region

347 views • 18 slides

Coronal magnetic field models Nonlinear Force-Free Fields (NLFFF)

Nonlinear force-free extrapolation of coronal magnetic fields T. Wiegelmann, J.K. Thalmann, B. Inhester. Coronal magnetic field models Nonlinear Force-Free Fields (NLFFF) Consistency criteria for vector magnetograms and preprocessing Evolution of a flaring Active Region

186 views • 18 slides

Dissipation in Force-Free Astrophysical Plasmas

Dissipation in Force-Free Astrophysical Plasmas. Radio lobe formation and relaxation Dynamical magnetic dissipation in force-free plasmas: (with K. Bowers, X. Tang, S. Colgate) Transport and dissipation of helicity and energy. Hui Li (Los Alamos National Lab).

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Excitation of Supernova Remnants by Twisting of the Neutron Star Dipole Magnetic Flux

Excitation of Supernova Remnants by Twisting of the Neutron Star Dipole Magnetic Flux. Stirling Colgate, LANL with Hui Li, LANL & Ken Fowler, UC Berkley, LAUR-0805268.

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Extrapolation of coronal magnetic fields from photospheric measurements

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2. Method outline Equation of relative helicity (Berger 1985):

a. b. c. Determination of Coronal Magnetic Helicity of Solar Active Regions Using the Linear Force-Free Field Model. Eun-Kyung Lim, Hyewon Jeong, Jongchul Chae Seoul National University, Korea. 2. Method outline Equation of relative helicity (Berger 1985):

185 views • 8 slides