Solar Polarization Proceedings of an International Workshop held in

Novel instruments for high-precision imaging polarimetry have opened new possibilities, not only for diagnostics of magnetic fields, but also for exploring effects in radiative scattering, atomic physics, spectral line formation and radiative transfer. Th

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ASTROPHYSICS AND SPACE SCIENCE LIBRARY VOLUME243

EDITORIAL BOARD Chairman W. B. BURTON, Sterrewacht, Leiden, P.O. Box 9513,2300 RA Leiden, The Netherlands [email protected]

Executive Committee J. M. E. KUIJPERS, Faculty of Science, Nijmegen, The Netherlands E. P. J. VAN DEN HEUVEL, Astronomical Institute, University ofAmsterdam, The Netherlands H. VAN DER LAAN, Astronomical Institute, University of Utrecht, The Netherlands

MEMBERS I. APPENZELLER, Landessternwarte Heidelberg·Knigstuhl, Germany J. N. BAHCALL, The Institute for Advanced Study, Princeton, U.S.A. F. BERTOLA, Universitd di Padova, Italy J. P. CASSINELLI, University ofWisconsin, Madison, U.SA. C. J. CESARSKY, Centre d'Etudes de Saclay, Gif-sur-Yvette Cedex, France O. ENGVOLD, Institute ofTheoretical Astrophysics. University ofOslo. Norway R. McCRAY, University ofColorado, JILA. Boulder. U.SA P. G. MURDIN, Royal Greenwich Observatory, Cambridge, u.K. F. PACINI, Istituto Astronomia Arcetri, Firenze. Italy V. RADHAKRISHNAN, Raman Research Institute, Bangalore, India K. SATO, School of Science, The University ofTokyo, Japan F. H. SHU, University ofCalifornia, Berkeley, U.SA. B. V. SOMOV, Astronomical Institute, Moscow State University, Russia R. A. SUNYAEV, Space Research Institute, Moscow. Russia Y. TANAKA, Institute of Space & Astronautical Science. Kanagawa. Japan S. TREMAINE, CITA. Princeton University. U.SA. N. O. WEISS, University ofCambridge. U.K.

SOLAR POLARIZATION Proceedings of an International Workshop held in Bangalore, India, 12-16 October 1998 Edited by K. N. NAGENDRA Indian Institute 01 Astrophysics, Bangalore, India

and J. O. STENFLO Institute 01 Astronomy, ETH Zentrum, Zurich, Switzerland

Springer-Science+Business Media, B.Y.

A C.LP. Catalogue record for this book is available from the Library of Congress.

ISBN 978-90-481-5261-2 ISBN 978-94-015-9329-8 (eBook) DOI 10.1007/978-94-015-9329-8

Printed on acid-free paper

All Rights Reserved © 1999 Springer Science+Business Media Dordrecht Originally published by Kluwer Academic Publishers in 1999. Softcover reprint of the hardcover 1st edition 1999 No part of the material protected by this copyright notice may be reproduced or utilized in any form or by any means, electronic or mechanical, inc1uding photocopying, recording or by any information storage and retrieval system, without written permission from the copyright owner.

TABLE OF CONTENTS

ix-xiii

Preface J.O. STENFLO / Solar magnetism and the second solar spectrum: Future directions

1-16

C.U. KELLER and N.R. SHEELEY JR. / Scattering polarization in the chromosphere

17-30

M. BIANDA, J.O. STENFLO and S.K. SOLANKI / Observations of the Hanle effect in the Ca I 4227 and Sr II 4078 A lines

31-42

v.

BOMMIER / The density matrix theory for polarized radiation redistribution: Extensions for multilevel atom model and quantum Doppler effect

43-59

E. LANDI DEGL'INNOCENTI / Evidence for ground-Ievel atomic polarization in the solar atmosphere

61-71

J. TRUJILLO BUENO / Towards the modelling of the second solar spectrum