SP-596 November 2005 Proceedings of the International Scientific Conference on Chromospheric and Coronal Magnetic Fields 30 August – 2 September 2005 Katlenburg-Lindau, Germany SCIENTIFIC ORGANISING COMMITTEE Sami K. Solanki (Chair) Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany Bernhard Fleck ESA Research and Scientific Support Department, Goddard, USA Sarah Gibson HAO/NCAR, Boulder, USA Franz Kneer Universitäts-Sternwarte, Göttingen, Germany Tetsuya Magara NRL, Washington DC, USA Valery Nakariakov University of Warwick, UK Eric Priest St Andrews University, UK Takashi Sakurai NAO, Tokyo, Japan Javier Trujillo Bueno Instituto de Astrofisica de Canarias, Tenerife, Spain Stephen White University of Maryland, USA LOCAL ORGANISING COMMITTEE (Max-Planck-Institut für Sonnensystemforschung) Davina Innes Andreas Lagg Jörg Büchner Bernd Inhester Eckart Marsch Manfred Schüssler Publication: Proceedings of the International Scientific Conference on Chromospheric and Coronal Magnetic Fields 30 August – 2 September 2005, Katlenburg-Lindau, Germany (ESA SP-596, November 2005) Editors: D.E. Innes, A. Lagg & S.K. Solanki Max-Planck-Institut für Sonnensystemforschung D. Danesy ESA Publications Division Published and distributed by: ESA Publications Division ESTEC, Postbus 299 2200 AG Noordwijk The Netherlands Printed in: The Netherlands Price: E 50 ISBN: 92-9092-907-3 ISSN: 1609-042X Copyright: © 2005 European Space Agency SP-596 Table of Contents PREFACE Session 1 Chromospheric and Coronal Magnetic Fields I Chair: S. Solanki HEATING THE SOLAR X-RAY CORONA E.N. Parker ON THE TOMOGRAPHY RECONSTRUCTION OF THE CORONAL MAGNETIC FIELD FROM CORONAL HANLE/ZEEMAN OBSERVATIONS M.I. Kramar & B. Inhester Chromospheric and Coronal Magnetic Fields II Chair: B. Fleck MEASUREMENT METHODS FOR CHROMOSPHERIC AND CORONAL MAGNETIC FIELDS N.-E. Raouafi THE SCIENTIFIC CASE FOR QUANTUM SPECTROPOLARIMETRY FROM SPACE J. Trujillo Bueno, E. Landi Degl’Innocenti, R. Casini & V. Martínez Pillet UV POLARIMETRY OF THE SECOND SOLAR SPECTRUM A. Gandorfer Chromospheric and Coronal Magnetic Fields III Chair: F. Kneer RESULTS FROM CHROMOSPHERIC MAGNETIC FIELD MEASUREMENTS A. Lagg MAGNETIC LOOPS: A COMPARISON OF EXTRAPOLATIONS FROM THE PHOTOSPHERE WITH CHROMOSPHERIC MEASUREMENTS T. Wiegelmann, A. Lagg, S. Solanki, B. Inhester & J.Woch THE VERTICAL COMPONENT OF ELECTRIC CURRENT DENSITIES IN SUNSPOTS H. Balthasar LINE FORMATION IN INHOMOGENEOUS ATMOSPHERES AND THE MAGNETIC STRUCTURE OF THE INTERNETWORK T.A. Carroll & J. Staude Chromospheric and Coronal Magnetic Fields IV Chair: M. Carlsson RADIO MEASUREMENTS OF CORONAL MAGNETIC FIELDS S.M. White MAGNETIC FIELDS AND INTENSITY CHANGES IN CORONAL DIMMING REGIONS G.D.R. Attrill, N. Narukage, K. Shibata & L.K. Harra MAGNETIC FIELD EXTRAPOLATION T. Neukirch DESCRIBING CORONAL MAGNETIC FIELDS BY SUCCESSIVE FORCE-FREE EQUILIBIA S. Régnier & R.C. Canfield CORONAL HEATING THROUGH BRAIDING OF MAGNETIC FIELD LINES SYNTHESIZED CORONAL EUV EMISSION AND MAGNETIC STRUCTURE H. Peter, B.V. Gudiksen & A. Nordlund Session 2 Coupling to the Photosphere I Chair: M. Schüssler SMALL SCALE MAGNETIC ELEMENTS AS BRIGHT POINTS IN THE BLUE Hα WING J. Leenaarts, P. Sütterlin, R.J. Rutten, M. Carlsson & H. Uitenbroek SIMULATIONS OF MAGNETOHYDRODYNAMICS AND CO FORMATION FROM THE CONVECTION ZONE TO THE CHROMOSPHERE S. Wedemeyer-Böhm, W. Schaffenberger, O. Steiner, M. Steffen, B. Freytag & I. Kamp MAGNETIC NETWORK AND CANOPY M. Zhang Coupling to the Photosphere II Chair: J. Trujillo Bueno DETERMINATION OF THE MAGNETIC FIELD VECTOR IN A POLAR CROWN PROMINENCE VIA THE HANLE AND ZEEMAN EFFECTS IN THE HE I 10830 Å MULTIPLET. L. Merenda, J. Trujillo Bueno, E. Landi Degl’Innocenti & M. Collados OBSERVATIONAL EVIDENCE OF PHOTOSHPERIC MAGNETIC DIPS IN FILAMENT CHANNELS B. Schmieder, A. López Ariste & G. Aulanier Coupling to the Photosphere III Chair: S. Antiochos THE SIZE OF SMALL-SCALE SOLAR MAGNETIC REGIONS E.Wiehr & K.G. Puschmann MAGNETIC FIELDS MEASURED IN SPICULES. A. López Ariste & R. Casini MAGNETIC TOPOLOGIES: WHERE WILL RECONNECTION OCCUR ? P. Démoulin ON SOLAR CORONAL HEATING BY FORCED MAGNETIC RECONNECTION R. Jain, P. Browning & K. Kusano Coupling to the Photosphere IV Chair: T. Magara FORMATION AND DYNAMICS OF CURRENT SHEETS H. Isobe MHD SHOCK WAVE STRUCTURE IN SUPERSONIC MAGNETIC RECONNECTION T. Shimizu, K. Kondo & M. Ugai THE EMERGENCE AND EVOLUTION OF TWISTED MAGNETIC FLUX ROPES IN THE SOLAR CORONA Y. Fan, S.E. Gibson & W. Manchester MAGNETIC FLUX EMERGENCE AND ITS INTERACTION WITH AN EXISTING CORONAL FIELD K. Galsgaard, F. Moreno-Insertis, V. Archontis & A. Hood Session 3 Magnetic Structures I Chair: S. White TIME-DEPENDENT RESPONSE OF THE LARGE-SCALE SOLAR CORONA J.A. Linker, R. Lionello, Z. Mikic, & P. Riley QUANTITATIVE LINK BETWEEN SOLAR EJECTA AND INTERPLANETARY MAGNETIC CLOUDS: MAGNETIC HELICITY C.H. Mandrini, S. Dasso, M.L. Luoni, S. Pohjolainen, P. Démoulin & L. van Driel-Gesztelyi SIMULATION STUDY ON THE SELF-ORGANIZATION OF SIGMOIDAL STRUCTURE AND THE ONSET OF SOLAR FLARES K. Kusano, S. Inoue, T. Yamamoto, T. Yokoyama & T. Sakurai Session 4 Magnetic Instabilities I Chair: E. Priest NUMERICAL SIMULATIONS OF 3D MAGNETIC RECONNECTION DUE TO ROTATIONAL DRIVING I. De Moortel & K. Galsgaard Magnetic Instabilities II Chair: P. Démoulin SMALL-SCALE MAGNETIC ACTIVITY C.J. Schrijver A COMPARISON BETWEEN SPICULES IN Hα AND CIV A. de Wijn, B. De Pontieu & R. Erdélyi OBSERVATION OF SMALL SCALE RECONNECTION ROLE IN UNDULATED FLUX TUBE EMERGENCE E. Pariat, G. Aulanier, B. Schmieder, M.K. Georgoulis, D.M. Rust & P.N. Bernasconi PHYSICALLY CONSISTENT SIMULATION OF CHROMOSPHERIC AND CORONAL MAGNETIC FIELDS J. Büchner & B. Nikutowski Magnetic Instabilities III Chair: A. van Ballegooijen DOWNFLOWS ALONG AN OFF-LIMB LOOP SEEN BOTH IN 30.4NM AND Hα A. De Groof, D.A.N. Müller & S. Poedts A MULTI-WAVELENGTH VIEW ON CORONAL RAIN D.A.N. Müller, A. De Groof, B. De Pontieu & V.H. Hansteen TRANSVERSE WAVES IN A POST-FLARE SUPRA-ARCADE E. Verwichte, V.M. Nakariakov & F.C. Cooper Session 5 Chromospheric and Coronal Seismology I Chair: E. Marsch CHROMOSPHERIC WAVES M. Carlsson & V. Hansteen SIMULATIONS OF MAGNETO- ACOUSTIC WAVES IN SUNSPOTS E.V. Khomenko & M. Collados DETECTION OF WAVES IN THE EQUATORIAL CORONAL HOLES D. Banerjee, E. O’Shea & J.G. Doyle OSCILLATIONS AND WAVES IN CORONAL LOOPS T. Wang Chromospheric and Coronal Seismology II Chair: V. Nakariakov IMPULSIVE GENERATION OF VERTICAL OSCILLATIONS OF A SOLAR CORONAL ARCADE LOOP M. Selwa, K. Murawski, S.K. Solanki, T.J.Wang, & U. Shumlak DYNAMICS OF CORONAL LOOP OSCILLATIONS T. Van Doorsselaere, I. Arregui, J. Andries, M. Goossens & S. Poedts FIRST RESULTS FROM SECIS OBSERVATIONS OF THE 2001 TOTAL SOLAR ECLIPSE A.C. Katsiyannis, D.R.Williams, F. Murtagh, R.T.J. McAteer & F.P. Keenan X-RAY QUASI-PERIODIC PULSATIONS IN SOLAR FLARES AS MAGNETOHYDRODYNAMIC OSCILLATIONS C. Foullon, E. Verwichte, V.M. Nakariakov & L. Fletcher Summary CHROMOSPHERIC AND CORONAL MAGNETIC FIELDS E. Priest Poster Session DISCONTINUITIES IN THE SOLAR WIND FROM MULTISPACE OBSERVATIONS A. Asadchy, A. Skalsky, G. Zastenker, N. Shevyrev & M. Ryasantseva SUPERSONIC DOWNFLOWS IN THE SOLAR CHROMOSPHERE ARE VERY COMMON R. Aznar Cuadrado, S.K. Solanki & A. Lagg STUDY OF ASYMMETRIES OF STOKES PROFILES FROM HIGH SPATIAL RESOLUTION SPECTROPOLARIMETRY N. Bello González, O. Okunev & F. Kneer CHROMOSPHERIC AND CORONAL SIGNATURES OF MAGNETIC FLUX CANCELLATION IN A SUNSPOT’S MOAT C. Beck, L.R. Bellot Rubio & S. Nagata STUDY OF POLAR FACULAE J. Blanco Rodríguez, B. Sánchez-Andrade Nuño, K.G. Puschmann & F. Kneer PHYSICAL PARAMETERS OF DARK MOTTLES IN Hα Z. Funda Bostanci 3D MAGNETO-CONVECTION AND FLUX EMERGENCE IN THE PHOTOSPHERE M. Cheung, M. Schüssler & F. Moreno-Insertis MAGNETIC FLUX EMERGENCE AND ITS INTERACTION WITH AN EXISTING CORONAL FIELD K. Galsgaard, F. Moreno-Insertis, V. Archontis & A. Hood ANALYSIS OF DYNAMICS OF LOOPS IN AN ACTIVE REGION ASSOCIATED WITH A SMALL C- CLASS FLARE P. Gömöry, J. Rybák, A. Kucera & H. Wöhl FULL-STOKES POLARIMETRY OF THE CHROMOSPHERE IN THE Hα LINE Y. Hanaoka ON THE ELECTRON AND ION ACCELERATION DURING THE FLARE ON 28.10.2003 I.V. Oreshina & B.V. Somov PHOTOSPHERIC AND CHROMOSPHERIC MAGNETIC STRUCTURE OF A SUNSPOT D. Orozco Suarez, A. Lagg & S.K. Solanki HOW STRONG IS THE DEPENDENCE OF THE SOLAR CHROMOSPHERE UPON THE CONVECTION ZONE? W. Rammacher EVOLUTION OF THE MAGNETIC ENERGY BUDGET IN AR 10486 FROM POTENTIAL AND NONLINEAR FORCE-FREE MODELS S. Régnier, B. Fleck, V. Abramenko & H.-Q. Zhang ANALYSIS OF A WIDE CHROMOSPHERIC ACTIVE REGION B. Sánchez-Andrade Nuño, K.G. Puschmann, M. Sánchez Cuberes, J. Blanco Rodríguez & F. Kneer PLASMA FLOW VELOCITIES INFERRED FROM PHOTOSPHERIC MAGNETIC FIELD OBSERVATIONS - A COMPARISON J.C. Santos, J. Büchner, M.V. Alves, B. Nikutowski & H. Zhang INFLUENCE OF THE PASCHEN-BACK EFFECT ON THE STOKES PROFILES OF THE HE 10830 Å TRIPLET C. Sasso, A. Lagg & S.K. Solanki MAGNETOHYDRODYNAMIC SIMULATION FROM THE CONVECTION ZONE TO THE CHROMOSPHERE W. Schaffenberger, S. Wedemeyer-Böhm, O. Steiner & B. Freytag THE STRUCTURE OF THE LOWER TRANSITION REGION AS INFERRED FROM THE HYDROGEN LYMAN-α LINE RADIANCE L. Teriaca, U. Schühle, S.K. Solanki, W. Curdt & E. Marsch ANALYSIS OF POLARIMETRIC SUNSPOT DATA FROM TESOS/VTT/TENERIFE L. Valdivielso Casas, N. Bello González, K.G. Puschmann, B. Sánchez-Andrade Nuño & F. Kneer SOME FRACTAL PROPERTIES OF SOLAR MAGNETIC FIELDS B. Ioshpa, E. Mogilevskii, V. Obridko & E. Rudenchik ON THE SCALING OF MAGNETIC FIELD STRENGTH WITH LOOP LENGTH