Member: Dr. Thorsten A. Carroll

Research Area :

• Stellar & Solar Magnetic Fields
• Extrasolar Planets
• Inverse Problems & Zeeman-Doppler Tomography
• Stochastic Modeling & Radiative Transfer
• Wavelet & Principal Component Analysis
• Neural Networks & Pattern Recognition
• Nonlinear Optimization
  
  

Teaching :

• Vorlesung: Statistische Lernverfahren und Mustererkennung in der Astrophysik - WS2009/10
  

  
  

• Vorlesung: Cool Star Astrophysics - WS2008/09
  

  
  

• Vorlesung: Stellar Structure and Evolution - SS2008
  

  
  

• Vorlesung: Physik kosmischer Magnetfelder - SS2007
  
  
  

PhD-Thesis :

• Zur Linienentstehung und Diagnostik in kleinskaligen Magnetfeldern der solaren Photosphäre
  - Ein Modell des stochastischen Transports polarisierter Strahlung -

  .PDF (1.0 MB) Zur Linienentstehung und Diagnostik in kleinskaligen Magnetfeldern der solaren Photosphäre
  - Ein Modell des stochastischen Transports polarisierter Strahlung -
  
  

Diploma-Thesis :

• Inversion und Analyse von Stokes Linienprofilen mit künstlichen neuronalen Netzen und Response-Funktionen

  GEZIPPED Postscript (3.3 MB) Inversion und Analyse von Stokes Linienprofilen mit künstlichen neuronalen Netzen und Response-Funktionen
  

  GEZIPPED .DOC (1.7 MB) Inversion und Analyse von Stokes Linienprofilen mit künstlichen neuronalen Netzen und Response-Funktionen
  
  

Publications:

• Carroll, T.A., Kopf, M., Strassmeier, K.G, Ilyin, I. : Detecting and measuring weak stellar magnetic fields -- A Wavelet and PCA based approach , 2009, A&A, in preparation

• Carroll, T.A., Kopf, M., Strassmeier, K.G, Ilyin, I. : The Surface Magnetic Field of II Peg from 2004 to 2007 , 2009, A&A, in preparation

• Weber, M., Carroll, T.A., Granzer, T., Steffen, M., Strassmeier, K.G : Monitoring mass motions of Betelgeuse's photosphere using robotic telescopes , 2009, Memorie della Societa Astronomica Italiana, v.80, p.743

• Carroll, T.A., Kopf, M., Ilyin,I., Strassmeier, K.G : Zeeman-Doppler Imaging : old problems - new methods , 2009, Proceedings of the 259 IAU Symposium, Eds. K.G. Strassmeier, A.G. Kosovichev, J. Beckmann ,Cambridge University Press, Vol.259, p.633

• Carroll, T.A., Kopf, M., Ilyin,I., Strassmeier, K.G, Tuominen, I. : Zeeman-Doppler Imaging of II Peg -- The surface magnetic field from 2004 to 2007 , 2009, Proceedings of the 259 IAU Symposium, Eds. K.G. Strassmeier, A.G. Kosovichev, J. Beckmann, Cambridge University Press, Vol.259, p.437

• Strassmeier, K. G., Woche, M., Ilyin, I., Popow, E., Bauer, S.-M., Dionies, F., Fechner, T., Weber, M., Hofmann, A., Storm, J., Materne, R., Bittner, W., Bartus, J., Granzer, T., Denker, C., Carroll, T., Kopf, M., DiVarano, I., Beckert, E., Lesser, M. : PEPSI: the Potsdam Echelle Polarimetric and Spectroscopic Instrument for the LBT , 2008, Ground-based and Airborne Instrumentation for Astronomy II. Edited by McLean, Ian S.; Casali, Mark M. Proceedings of the SPIE, Volume 7014, pp. 70140N

• Carroll, T.A., Kopf, M., Strassmeier, K.G : A Fast Method for Stokes Profile Synthesis -- Radiative Transfer Modeling for ZDI and Stokes Profile Inversion , 2008, A&A, 488, 781

• Martinez Gonzalez, M. J., Asensio Ramos, A., T.A., Kopf, M., Ramirez Velez, J. C.; Semel, M.: PCA detection and denoising of Zeeman signatures in stellar polarised spectra , 2008, A&A, 486, 637

• Carroll, T.A., Kopf, M. : Zeeman-Tomography of the Solar Photosphere -- 3-Dimensional Surface Structures Retrieved from HINODE Observations , 2008, A&A, 481, 37

• Carroll, T.A., Kopf, M. : Zeeman-Tomography of a Quiet Sun Region , 2007, Proceedings of the "5th International Workshop on Solar Polarization", Locarno, Switzerland, ASP Conference Series, v.405, p.287

• Kopf, M., Carroll, T.A., Strassmeier, K.G. : A New Zeeman-Doppler Imaging Code , 2007, Proceedings of the "5th International Workshop on Solar Polarization", Locarno, Switzerland, ASP Conference Series, v.405, p.517

• Kopf, M., Carroll, T.A., Strassmeier, K.G. : A Fast Stokes Profile Synthesis , 2007, Proceedings of the "5th International Workshop on Solar Polarization", Locarno, Switzerland, ASP Conference Series, v.405, p.535

• Carroll, T.A., Kopf, M., Ilyin,I., Starssmeier, K.G.: Zeeman-Doppler Imaging of late-type stars -- The Surface Magnetic Field of II Peg , 2007, Astronomische Nachrichten, Vol 328, Issue 10, p. 1043

• Carroll, T.A. : Zeeman-Doppler imaging from Stokes IQUV line profiles , 2007, Astronomische Nachrichten, Vol.328, Issue 7, p.632

• Carroll, T.A., Kopf, M.. : The Mesostructured Magnetic Atmosphere -- A Stochastic Polarized Radiative Transfer Approach , 2007, A&A, 468, 323

• Strassmeier, K.G., Carroll, T.A., Rice, J.B., Savanov, I.S. : Resolving Stellar Surface Spots ,2007, Mem. d. Societa Astronomica, Vol.78, p.278

• Carroll, T.A., : Stokes Profile Inversion in Mesostructured Magnetic Atmospheres ,2007, in Solar Modern Facilities -- Advanced Solar Science, eds. F. Kneer, K.G. Puschmann, D. Wittmann, University Press Goettingen, p.297

• Kopf, M., Carroll, T.A., Strassmeier, K.G. : A Fast Stokes Profile Synthesis for Zeeman-Doppler-Imaging , 2006, Solar and Stellar Activity Cycles, 26th meeting of the IAU, Joint Discussion 8, 17-18 August 2006, Prague, Czech Republic, JD08, \#23, 8

• Carroll, T.A., Staude J. : The Magnetic Fluctuation in a Sunspot Penumbra , 2006, Proceedings of the "4th International Workshop on Solar Polarization", Boulder, Colorado, USA, ASP Conference Series Vol. 358, p.137

• Carroll, T.A., Staude J. : Line Formation in Inhomogeneous Atmospheres and the Magnetic Structure of the Internetwork , 2005, Proceedings of "Chromospheric and Coronal Magnetic Fields", Katlenburg-Lindau, Germany, ESA-SP-596_CCMF

• Carroll, T.A., Staude J. : Line Formation in Turbulent Magnetic Atmospheres , 2004, Astronomische Nachrichten, Vol. 326, Issue 3, p.296

• Carroll, T.A., Staude J. : Meso-Structured Magnetic Atmospheres: Stochastic Polarized Radiative Transfer and Stokes Profile Inversion, 2003, Astronomische Nachrichten, Vol. 324, Issue 4, p.392

• Carroll, T.A., Staude J. : Diagnostics of Magnetic Field Mesostructuring , 2003, Proceedings of the "3rd International Workshop on Solar Polarization", Tenerife, Puerto de la Cruz, Spain, ASP Conference Series Vol. 307, p.125

• Carroll, T.A., Muglach K., Balthasar H. : Application of Artificial Neural Networks to Solar Infrared Stokes Spectra, 2002, IL NUOVO CIMENTO, 25/506, 513

• Carroll, T.A., Staude J. :The Inversion of Stokes Profiles with Artificial Neural Networks, 2001, A&A, 378, 316

• Carroll, T.A., Balthasar, H., Muglach, K., Nickelt, I. : Inversion of Stokes Profiles with Artificial Neural Networks, 2001, Advanced Solar Polarimetry - Theory, Observations and Instrumentation,, ed. M. Sigwarth, ASP Conference Series Vol. 236, p.511

• Carroll, T.A., Staude J. : The Analysis and Interpretation of Stokes Profiles with Artificial Neural Networks, 2001, Proceedings of "Solar Encounter: The First Solar Orbiter Workshop", Puerto de la Cruz, Tenerife, Spain, ESA SP-493, p.183

• Settele A., Carroll, T.A., Nickelt I., Norton A.A. : Systematic Errors in Measuring Magnetic Fields with an FPI Spectrometer and MDI, 2001, A&A, 386, 1123