Homepage of Dr. Thomas Wiegelmann

3D-Coronal magnetic field. Potential field reconstruction. (See Movie) Upper Picture: The Solar Corona observed with LASCO C1
Lower Picture: MHD-Model of the Solar Corona

Some movies with the Titov Demoulin equilibrium

Original Titov Demoulin equilibrium.

Potential field reconstruction.

Non-linear force-free reconstruction (All boundaries prescribed).

Non-linear force-free reconstruction (Only photosphere prescribed).

Original (green) and Case I (red).

Original (green) and Case II (red).

Coronal magnetic field evolution of AR8210

AR8210 Potential Field.

AR8210 Nonlinear Force-free Field.

Welcome to my Homepage
I am working in the Solar Corona in 3D Group (SoCo3D) at the Max Planck-Institute for Solar System Research (MPS) . I wrote my Diploma Thesis and Doctoral Thesis at the Lehrstuhl für Theoretische Weltraum- und Astrophysik at the Ruhr Universität Bochum. After finishing my thesis in 1998, I worked at the Max Planck-Institut für Aeronomie in D-37191 Katlenburg-Lindau, Germany (1998-2000) and in the in the Solar Theory Group at the University of Saint Andrews, Scotland (2000-2002).

To contact me, write an EMail to: wiegelmann@REMOVElinmpi.mpg.de
(You have to remove the word REMOVE in my emailaddress!) My research interests are:

Solar Physics
Active Regions
Coronal holes
Magnetic fields
Coronal heating
Solar image processing
Tomography
Stereoscopy
Magnetic Reconnection
Helmet Streamer
Solar Wind
Coronal Mass Ejections (CMEs)
Basic Plasmaphysics (MHD, Kinetics)
Optimization Methods
This Online Paper gives a brief summary about helmet streamers.

PUBLICATIONS

Refereed Papers

(1) T. Wiegelmann and K. Schindler: Formation of thin current sheets in a quasistatic magnetotail model (Geophysical Research Letters, Vol.22 2057-2060 8/1995)
(2) T. Wiegelmann Solar Magnetic Fields: Triple Arcade Structures (Physica Scripta. Vol. T74, 77-81, 1998)
(3) T. Wiegelmann , K.Schindler and T. Neukirch: Helmet Streamers with Triple Structures: Weakly Two-Dimensional Stationary States (Solar Physics, Vol. 180, 439-460, 1998)
(4) T. Wiegelmann , K.Schindler and T. Neukirch: Helmet Streamers with Triple Structures: Simulations of resistive dynamics. (Solar Physics, Vol. 191(2), 391-407, 2000)
(5) T. Wiegelmann and J.Buechner: Kinetic simulations of the coupling between current instabilities and reconnection in thin current sheets. (Nonlinear Processes in Geophysics, Vol. 7, 141-150, 2000)
(6) T. Wiegelmann and J.Buechner: Evolution of magnetic helicity in the course of kinetic magnetic reconnection. (Nonlinear Processes in Geophysics, Vol. 8, 127-140, 2001)
(7) T. Wiegelmann and J.Buechner: Evolution of magnetic helicity under kinetic magnetic reconnection. Part II $\vec B \not=0$ reconnection. (Nonlinear Processes in Geophysics, Vol. 9, 139-147, 2002. )
(8) T. Wiegelmann and T. Neukirch: Including Stereoscopic Information in the Reconstruction of Coronal Magnetic Fields. (Solar Physics, Vol. 208: 233-251, 2002.)
(9) T. Wiegelmann and T. Neukirch: Computing nonlinear force free magnetic fields. (Nonlinear Processes in Geophysics, Vol. 10, 313-322, 2003.)
(10) T. Wiegelmann and B. Inhester: Magnetic modeling and tomography: First steps towards a consistent reconstruction of the solar corona. (Solar Physics, Vol. 214: 287-312, 2003.)
(11) L. Carcedo, D. S. Brown, A. W. Hood, T. Neukirch and T. Wiegelmann : A Quantitative Method to Optimise Magnetic Field Line Fitting of Observed Coronal Loops. (Solar Physics, Vol. 218: 29-40, 2003.)
(12) T. Wiegelmann: Optimization code with weighting function for the reconstruction of coronal magnetic fields. (Solar Physics, Vol. 219: 87-108, 2004.)
(13) E. Marsch, T. Wiegelmann and L.D. Xia: Coronal plasma flows and magnetic fields in solar active regions: Combined observations from SOHO and NSO/Kitt Peak (A&A, Vol. 428, 629-645, 2004.)
(14) T. Wiegelmann and S.K. Solanki: Similarities and differences between coronal holes and the quiet Sun: are loop statistics the key? (Solar Physics, Vol. 225, 227-247, 2004.)
(15) T. Wiegelmann, A. Lagg, S.K. Solanki, B. Inhester, J. Woch: Comparing magnetic field extrapolations with measurements of magnetic loops. (A&A, Vol. 433, 701-705, 2005.)
(16) T. Wiegelmann, L. D. Xia and E. Marsch: Links between magnetic fields and plasma flows in a coronal hole. (A&A, Vol. 432, L1-L4, 2005.)
(17) T. Wiegelmann, B. Inhester, A. Lagg, S.K. Solanki: How to use magnetic field information for coronal loop identification? (Solar Physics, Vol. 228, 67-78, 2005.)
(18) T. Wiegelmann, B. Inhester, T.Sakurai: Preprocessing of vector magnetograph data for a nonlinear force-free magnetic field reconstruction. (Solar Physics, Vol. 233, 215-232, 2006.)
(19) B. Inhester and T. Wiegelmann : Nonlinear force-free magnetic field extrapolations: comparison of the Grad-Rubin and Wheatland-Sturrock-Roumeliotis algorithm. (Solar Physics, Vol. 235,201-221, 2006.)
(20) C.J. Schrijver, M.L. DeRosa, T.R. Metcalf, Y. Liu, J. McTiernan, S. Regnier, G. Valori, M.S. Wheatland, T. Wiegelmann : Nonlinear force-free modeling of coronal magnetic fields Part I: A quantitative comparison of methods. (Solar Physics, Vol. 235,161-190, 2006.)
(21) T. Wiegelmann, B. Inhester, B. Kliem, G. Valori and T. Neukirch: Testing non-linear force-free coronal magnetic field extrapolations with the Titov-Demoulin equilibrium. (A&A, Vol. 453, 737-741, 2006.)
(22) T. Wiegelmann and B.Inhester: Magnetic Stereoscopy. (Solar Physics, Vol. 236, 25-40, 2006.)
(23) T. Wiegelmann and T. Neukirch: An optimization principle for the computation of MHD equilibria in the solar corona. (A&A, Vol. 457, 1053-1058, 2006.)
(24) M.J. Aschwanden, L.F. Burlaga, M.L. Kaiser, C.K. Ng, D.V. Reames, M.J. Reiner, T.I. Gombosi, N. Lugaz, W.IV. Manchester, I.I. Roussev, T.H. Zurbuchen, C.J. Farrugia, A. Galvin, M.A. Lee, J.A. Linker, Z. Mikic, P. Riley, D. Alexander, A.W. Sandman, J.W. Cook, R.A. Howard, D. Odstrcil, V. Pizzo, J. Kota, P.C. Liewer, J. Luhmann, B. Inhester, R.W. Schwenn, S. Solanki, V.M. Vasyliunas, T. Wiegelmann , L. Blush, P. Bochsler, I.H. Cairns, P.A. Robinson, V. Bothmer, K. Kecskemety, A. Llebaria, M. Maksimovic, M. Scholer, R. Wimmer-Schweingruber: Theoretical Modeling for the STEREO Mission. (Space Science Reviews, 2006, DOI: 10.1007/s11214-006-9027-8 )
(25) G. Tsiropoula, K. Tziotziou, T. Wiegelmann , TH. Zachariadis, C. Gontikakis, H. Dara: Evolution of a coronal loop system (Solar Physics, Vol. 240, 37-48, 2007.)
(26) T. Wiegelmann: Computing nonlinear force-free coronal magnetic fields in spherical geometry. (Solar Physics, Vol. 240, 227-239, 2007.)
(27) L. Feng, T. Wiegelmann , B. Inhester, S.K. Solanki, W.Q. Gan, P. Ruan: Magnetic Stereoscopy of Coronal loops in NOAA 8891. (Solar Physics, Vol. 241, 235-249, 2007.)
(28) T. Wiegelmann , T. Neukirch, P. Ruan, B. Inhester: Optimization approach for the computation of magnetohydrostatic coronal equilibria in spherical geometry. (A&A, Vol. 475, 701-706, 2007.)
(29) L. Feng, B. Inhester, S. Solanki, T. Wiegelmann, B. Podlipnik, R. Howard, J.-P. Wuelser: First stereoscopic coronal loop reconstructions from STEREO/SECCHI images (ApJL, Vol. 671, L205-L208, 2007.)
(30) T. Wiegelmann: Nonlinear force-free modeling of the solar coronal magnetic field (JGR, VOL. 113, A03S02, doi:10.1029/2007JA012432, 2008 ) Copyright American Geophysical Union. Further reproduction or electronic distribution is not permitted.
(31) T. Metcalf, M. DeRosa, C. Schrijver, G. Barnes, A. VanBallegooijen, T. Wiegelmann, M. Wheatland, G. Valori, J. McTiernan: Non-linear force-free modeling of coronal magnetic fields. II. Modeling a filament arcade from simulated chromospheric and photospheric vector fields (Solar Physics, Vol. 247, 269-299, 2008)
(32) T. Wiegelmann, J. Thalmann, C. Schrijver, M. DeRosa, T. Metcalf: Can we improve the preprocessing of photospheric vector magnetograms by the inclusion of chromospheric observations? (Solar Physics, Vol. 247, 249-267, 2008)
(33) C. Schrijver, M. DeRosa, T. Metcalf, G. Barnes, B. Lites, T. Tarbell, J. McTiernan, G. Valori, T. Wiegelmann, M. Wheatland, T. Amari, G. Aulanier, P. Demoulin, M. Fuhrmann, K. Kusano, S. Regnier, J. Thalmann: Non-linear force-free field modeling of a solar active region around the time of a major flare and coronal mass ejection (ApJ, Vol. 675, 1637–1644, 2008)
(34) J. Jing, T. Wiegelmann, Y. Suematsu, M. Kubo, H. Wang: Changes of magnetic structure in 3-D associated with the X3.4 flare of 2006 december 13 (ApJL, Vol. 676, L81–L84, 2008)
(35) B. Inhester, L. Feng, T. Wiegelmann : Segmentation of loops from coronal EUV images. (Solar Physics, Vol. 248,379-393,2008)
(36) P. Ruan, T. Wiegelmann, B. Inhester, T. Neukirch, S. K. Solanki, L. Feng: A first step to reconstruct the solar corona self-consistently with a magnetohydrostatic model during solar activity minimum (A&A, Vol. 481,827-834, 2008)
(37) J.K. Thalmann, T. Wiegelmann: Evolution of flaring active region NOAA 10540 as a sequence of nonlinear force-free field extrapolations (A&A, Vol. 484, 495-502, 2008)
(38) Y. Guo, M. D. Ding, T. Wiegelmann, H. Li: 3D Magnetic Field Configuration of the 2006 December 13 Flare Extrapolated with the Optimization Method (ApJ, Vol. 679, 1629-1635, 2008)
(39) J.K. Thalmann, T. Wiegelmann, N.-E. Raouafi: First nonlinear force-free field extrapolations of SOLIS/VSM data (A&A, Vol. 488, L71-L74, 2008)
(40) E. Marsch, H. Tian, J. Sun, W. Curdt, T. Wiegelmann: Plasma flows guided by strong magnetic fields in the solar corona (ApJ, Vol. 685, 1262-1269, 2008)
(41) H. Wang, J. Jing, C. Tan, T. Wiegelmann, M. Kubo: Study of Magnetic Channel Structure in Active Region 10930 (ApJ, Vol. 687, 658-667, 2008)
(42) N. Srivastava, S.K. Mathew, R.E. Louis, T. Wiegelmann: Source region of the CME of November 18, 2003 that led to the strongest storm of cycle 23. (Journal of Geophysical Research, Volume 114, Issue A3, CiteID A03107)
(43) P. Ruan, A. Korth, E. Marsch, B. Inhester, S.K. Solanki, T. Wiegelmann, Q.-G. Zong, R. Bucik, K-H. Fornacon: Multiple-spacecraft study of an extended magnetic structure in the solar wind. (Journal of Geophysical Research, Volume 114, Issue A2, CiteID A02108)
(44) Jing, J., Chen, P., Wiegelmann, T. , Xu, Y., Park, S.-H., and Wang, H.: Temporal Evolution of Free Magnetic Energy Associated with Four X-class Flares. (The Astrophysical Journal, Volume 696, Issue 1, pp. 84-90, 2009)
(45) Derosa, M. L., Schrijver, C. J., Barnes, G., Leka, K. D., Lites, B. W., Aschwanden, M. J., Amari, T., Canou, A., McTiernan, J. M., R´egnier, S., Thalmann, J., Valori, G., Wheatland, M. S., Wiegelmann, T. , Cheung, M., Conlon, P. A., Fuhrmann, M., Inhester, B., and Tadesse, T.: A Critical Assessment of Nonlinear Force-Free Field Modeling of the Solar Corona for Active Region 10953. (The Astrophysical Journal, Volume 696, Issue 2, pp. 1780-1791, 2009)
(46) Guo, Y., Ding, M. D., Jin, M., Wiegelmann, T.: Formation Heights of Extreme Ultraviolet Lines in an Active Region Derived by Correlation of Doppler Velocity and Magnetic Field (The Astrophysical Journal, Volume 696, Issue 2, pp. 1526-1532, 2009)
(47) Feng, L., Inhester, B., Solanki, S. K., Wilhelm, K., Wiegelmann, T. , Podlipnik, B.; Howard, R. A.; Plunkett, S. P.; Wuelser, J. P.; Gan, W. Q.: Stereoscopic Polar Plume Reconstructions from STEREO/SECCHI Images (The Astrophysical Journal, Volume 700, Issue 1, pp. 292-301, 2009)
(48) Wiegelmann, T. , Inhester, B., Feng, L.: Solar stereoscopy - where are we and what developments do we require to progress? (Annales Geophysicae, Volume 27, Issue 7, pp.2925-2936, 2009)
(49) Madjarska, M. S., Wiegelmann, T. : Coronal hole boundaries evolution at small scales. I. EIT 195 A and TRACE 171 A view (A&A, Volume 503, pp.991-997, 2009)
(50) Tadesse, T. Wiegelmann, T. , Inhester, B.: Nonlinear force-free coronal magnetic field modelling and preprocessing of vector magnetograms in spherical geometry (A&A, Volume 508, pp.421-432, 2009)
(51) Wiegelmann, T., Yelles Chaouche,L., Solanki, S. K., Lagg, A.: Nonlinear force-free modelling: influence of inaccuracies in the measured magnetic vector. (A&A, Volume 511, A4, 2010)
(52) Jing, Ju; Tan, Changyi; Yuan, Yuan; Wang, Benjamin; Wiegelmann, Thomas ; Xu, Yan; Wang, Haimin: Free Magnetic Energy and Flare Productivity of Active Regions (ApJ,713,440J, 2010)
(53) Guo, Y.; Schmieder, B.; Démoulin, P.; Wiegelmann, T. ; Aulanier, G.; Török, T.; Bommier, V: Coexisting Flux Rope and Dipped Arcade Sections Along One Solar Filament (ApJ, 714, 343G, 2010)
(54) Cheng, X.; Ding, M. D.; Guo, Y.; Zhang, J.; Jing, J.; Wiegelmann, T. : Re-flaring of a Post-flare Loop System Driven by Flux Rope Emergence and Twisting (ApJ, 716L, 68C, 2010)
(55) Wiegelmann, T. and Inhester, B.: How to deal with measurement errors and lacking data in nonlinear force-free coronal magnetic field modelling? (A&A, in press, DOI: 10.1051/0004-6361/201014391)

Intranet

Thesis

(T1) T. Wiegelmann : Bildung dünner Stromschichten als Konsequenz zeitabhängiger Konvektion in magnetosphärischen Schweifkonfigurationen (Diplomarbeit (Master-thesis) 1995)
(T2) T. Wiegelmann : Zur Theorie von Helmetstreamern und ihrer Bedeutung fuer koronale Massenausbrueche und den langsamen Sonnenwind (Dissertation (PhD-thesis) 1998)

Conference Proceedings

(CP1) T. Wiegelmann and K.Schindler: Time Dependent Convection in the Earth's Magnetotail, in: Heyn, M.F., Kernbichler, W. and Biernat, H.K. (eds.): Current Topics in Astrophysical and Fusion Plasma Research, 197-201, 1994, Proceedings of the International Workshop on Plasma Physics IWWPP
(CP2) T. Wiegelmann , K.Schindler and T. Neukirch: Helmet Streamers with Triple Structures: Stationary States and Dynamics , in: J. Buechner et al. (eds.), Plasma Astrophysics and Space Physics, 739-745, 1999, Kluwer Academic Publishers
(CP3) YU.I.GALPERIN, L.M.ZELENYI, M.V.VESELOV, S.P.SAVIN, M.M.MOGILEVSKY, M.I.YANOVSKY, V.I.PROKHORENKO, N.A.EISMONT, V.E.KUNITSYN, I.V.SILIN, E.N.SOSNOVETS, J.BUECHNER, T.WIEGELMANN : CLOSELY-SPACED MULTI-SATELLITE PROJECT ROY TO STUDY SMALL-SCALE STRUCTURES DURING MAGNETIC FIELD ANNIHILATION AND STRONG TURBULENCE IN CRITICAL MAGNETOSPHERIC REGIONS: RESULTS OF THE PHASE A, In: D.G. Sibeck and K. Kudela (eds.), Interball in the ISTP Programm, 55-73. 1999, Kluwer Academic Publishers.
(CP4) J. Buechner, B. Nikutowski, V. Vasyliunas, J. Woch, Th. Wiegelmann , I. Axford, W. Baumjohann, K.H. Glassmeier, H.-U. Auster, K.-H. Fornacon, L.M. Zelenyi, Yu.I. Galerpin, S.P. Savin, M.V. Veselov, S.I. Klimov: SCHWARM - A SWARM OF SMALL SPACESCRAFT TO STUDY PLASMA TURBULENCE AND MAGNETIC FIELD ANNIHILATION, Proceedings 14th ESA Symposium on European Rocket and Balloon Programmes and Related Research, (ESA SP-437, September 1999)
(CP5) T. Wiegelmann , T. Neukirch and J. Büchner: Tests and Limits of Vlasov-Code Simulations and its Application to Null-Helicity and Co-Helicity Reconnection. Paper presented at the `Sixth International School/Symposium for Space Plasma Simulations', Garching, Germany, 3 - 8 September 2001, published in Proceedings of ISSS-6, edited by J. Büchner, C. T. Dum and M. Scholer, Copernicus Gesellschaft, 58-61 (2001).
(CP6) T. Wiegelmann , and S.K. Solanki: Why are Coronal Holes Indistinguishable from the Quiet Sun in Transition Region Radiation? Proceedings of the SOHO 15 Workshop - Coronal Heating. 6-9 September 2004, St. Andrews, Scotland, UK (ESA SP-575). Editors: R.W. Walsh, J. Ireland, D. Danesy, B. Fleck. Paris: European Space Agency, 2004., p.35
(CP7) T. Wiegelmann , A. Lagg, S.K. Solanki, B. Inhester, B.; J. Woch: Magnetic Loops: a Comparison of Extrapolations from the Photosphere with Chromospheric Measurements Proceedings of the International Scientific Conference on Chromospheric and Coronal Magnetic Fields (ESA SP-596). 30 August - 2 September 2005, Katlenburg-Lindau, Germany. Editors: D.E. Innes, A. Lagg & S.K. Solanki, Published on CDROM, p.7.1
(CP8) T. Wiegelmann : Non-Linear Force-Free Magnetic Fields Proceedings of the International Scientific Conference on Chromospheric and Coronal Magnetic Fields (ESA SP-596). 30 August - 2 September 2005, Katlenburg-Lindau, Germany. Editors: D.E. Innes, A. Lagg & S.K. Solanki, Published on CDROM, p.80.1
(CP9) Solanki, S. K., Lagg, A., Aznar Cuadrado, R., Orozco, D., Collados, M., Wiegelmann, T. , Woch, J., Sasso, C., and Krupp, N. (2006). Measuring the magnetic vector with the He I 10830 A line: A rich new world. In R. Casini and B. W. Lites, editors, Solar Polarization 4, volume 358 of ASP Conference Series, pages 431–436.
(CP10) Feng, L., Wiegelmann, T. , and Inhester, B. (2007). Magnetic stereoscopy of coronal loops in NOAA 8891. In F. Kneer, K. G. Puschmann, and A. D. Wittmann, editors, Modern solar facilities - advanced solar science, pages 269–+.
(CP11) Madjarska, M. S. and Wiegelmann, T. (2007). Evolution of coronal hole boundaries seen in EIT 195 A and TRACE 171 A images. In F. Kneer, K. G. Puschmann, and A. D. Wittmann, editors, Modern Solar Facilities - Advanced Solar Science, pages 249–252. Universitaetverlag Goettingen.
(CP12) Ruan, P., Wiegelmann, T. , and Inhester, B. (2007). Modeling large-scale coronal structures. In F. Kneer, K. G. Puschmann, and A. D. Wittmann, editors, Modern solar facilities - advanced solar science, pages 363–+.
(CP13) Wiegelmann, T. , Solanki, S. K., Lagg, A., and Yelles, L. (2007). Nonlinear forcefree magnetic field modelling for VIM on SO. In E. Marsch, K. Tsinganos, R. Marsden, and L. Conroy, editors, The Second Solar Orbiter Workshop. ESA SP-641, ESA Publ. Div., Noordwijk. On CD.
(CP14) Raouafi, N. E., Solanki, S. K., and Wiegelmann, T. (2008). Hanle Effect Diagnostics of the Coronal Magnetic Field - A Test Using Realistic Magnetic Field Configurations. ArXiv e-prints.
(CP15) Teriaca, L., Wiegelmann, T. , Lagg, A., Solanki, S. K., Curdt, W., Sekii, T., and the HINODE/SOT Team (2008). Loop morphology and flows and their relation to the magnetic field. In S. Matthews, J. M. Davis, and L. K. Harra, editors, First Results from Hinode, volume 397 of Astron. Soc. Pacific Conf. Ser., pages 196–.
(CP16) Wiegelmann, T. , Thalmann, J. K., Schrijver, C. J., Derosa, M. L., and Metcalf, T. R. (2008). Preprocessing of Hinode/SOT Vector Magnetograms for Nonlinear Force-Free Coronal Magnetic Field Modeling. In S. A. Matthews, J. M. Davis, and L. K. Harra, editors, First Results From Hinode, volume 397 of Astronomical Society of the Pacific Conference Series, pages 198–+.

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3D-Coronal magnetic field. Potential field reconstruction. (See Movie)	Upper Picture: The Solar Corona observed with LASCO C1 Lower Picture: MHD-Model of the Solar Corona