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SessionI:MAGNETICRECONNECTIONINTHESUNANDSTARS OpeningTalk TABLEOFCONTENTS Coronaeofstarsandaccretiondisks MEMORIEDELLASOCIET`AASTRONOMICAITALIANA

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MEMORIE DELLA SOCIET ` A ASTRONOMICA ITALIANA Vol.78 n.2 2007

Coronae of stars and accretion disks

Bonn, 12-13 December 2006 editors: M. Massi and T. Preibisch

TABLE OF CONTENTS

Foreword 221

List of Participants 224

Opening Talk E. Rieger

Discovering a solar periodicity by chance 227

Session I: MAGNETIC RECONNECTION IN THE SUN AND STARS C. E. Parnell

3D Magnetic reconnection, flares and coronal heating 229

L. Harra

Solar flares: the observations 236

S. V. Berdyugina

Preferred longitudes in solar and stellar activity 242

M. Massi

Stellar flaring periodicities 247

P. Browning and S. Dalla

Particle acceleration at 3D magnetic reconnection sites 255 C. Liefke, A. Reiners, and J. H. M. M. Schmitt

Magnetic field variations and a giant flare 258

L. Contarino, P. Romano, and F. Zuccarello

Application of the Kopp and Pneuman model to an M2.5 flare 261 B. P. Dabrowski and A. J. Kus

Millisecond solar radio spikes observed at 1420 Mhz 264

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218

D. Dobrzycka

Solar coronal jets 268

Session II: SOLAR and STELLAR CORONAE V. Holzwarth

Magnetic flux emergence in fast rotating stars 271

K. G. Strassmeier, T. Carroll, J. B. Rice, and I. S. Savanov

Resolving stellar surface spots 278

M. G¨udel

X-Ray and radio emission from stellar coronae 285

B. V. Gudiksen

Heating the Solar Corona 293

E. Ros and M. Massi

The flaring corona of UX Arietis 298

J. Forbrich, Th. Preibisch, and K. M. Menten

Coronae in the Coronet: simultaneous X-ray to radio monitoring of a young stellar

cluster 301

G. Hallinan, C. Lane, S. Bourke, A. Antonova, R. T. Zavala, W. F. Brisken, R. P. Boyle, F. J. Vrba, and A. Golden

Pulsating coherent radio emission from ultracool dwarfs 304 S.C. Marsden, M. Jardine, J.-F. Donati, P. Petit, M. Semel, and B.D. Carter

The photospheric magnetic field and coronal structure of HD 171488 307 J. Robrade, J.H.M.M. Schmitt, and A. Hempelmann

X-ray activity cycles in stellar coronae 311

M. Krause

Large scale magnetic fields in spiral galaxies 314

D. Uzdensky

Self-regulation of solar coronal heating via the collisionless reconnection condition 317

Session III: YOUNG STELLAR OBJECTS T. Montmerle

What can X-rays tell us about accretion, mass loss, and magnetic fields in young

stars ? 320

Th. Preibisch

The origin of X-ray emission from T Tauri stars 332

M. Jardine

The spatial structure of the coronae of T Tauri stars 340

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219 J. Ferreira and C. Zanni

On some MHD aspects of star-disc-jets systems 348

S.G. Gregory, M. Jardine, A. Collier Cameron, and J.-F. Donati

Rotational modulation of X-ray emission from T Tauri stars 356 H. M. G¨unther and J. H. M. M. Schmitt

Modelling the X-rays of classical T Tauri stars 359

M. G. Petr-Gotzens and M. Massi

The enigmatic radio emission from θ

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Orionis A 362

J. Forbrich, M. Massi, E. Ros, A. Brunthaler, and K. M. Menten

VLBI observations of protostellar coronal radio emission towards YLW 15 365 N. Grosso, et al.

X-ray emission from the young brown dwarfs of the Taurus Molecular Cloud 368 M. K¨uker and G. R¨udiger

Funnel flows from protoplanetary disks 371

Session IV: ACCRETION DISKS A. Brandenburg and B. von Rekowski

Dynamos in accretion discs 374

J. Malzac

Accretion disc coronae in black hole binaries 382

A. R´o˙za´nska, M. Sobolewska, and B. Czerny

Accretion disk with magnetic corona in AGN 390

M. Kaufman Bernado and M. Massi

A basic condition for jet formation in accreting X-ray binaries 393 A. Laor and E. Behar

On the origin of radio emission in radio quiet quasars 397 L. Hric and R. G´alis

Is there an accretion disc, envelope, or torus in the YY Her binary? 400 D. Uzdensky and J. Goodman

Towards a statistical theory of a magnetized accretion disk corona 403 N. K. Jackson, M. J. Church, M. Bałuci´nska-Church, and G. S. Halai

Neutron star radiation pressure leading to jet formation in the brightest LMXB 407 M. Mayer and J. E. Pringle

Time-dependent two-phase models of black hole accretion discs 410 A. Sadovski

The revised GRV model of accretion disc coronae 413

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220 L. C. Gallo

Evidence of coronal flaring in narrow-line Seyfert 1 galaxies 416 L.I. Matveyenko, D.A. Graham, and V.A. Demichev

Accretion disc and bipolar outflow in orion KL 419

Closing remarks M. G¨udel

Magnetic coronae in an astrophysical context 422

Riferimenti

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