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ASTRONOMICAL SOCIETY OF INDIA CONFERENCE SERIES

Volume 2

PROCEEDINGS OF THE FIRST ASIA-PACIFIC SOLAR PHYSICS MEETING

Indian Institute of Astrophysics Bengaluru, India March 21-24, 2011

Edited by:

Arnab Rai Choudhuri

Department of Physics, Indian Institute of Science Bengaluru, India

and

Dipankar Banerjee

Indian Institute of Astrophysics Bengaluru, India

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ASTRONOMICAL SOCIETY OF INDIA CONFERENCE SERIES

Volume 2

Series Editor: D.J. Saikia

National Centrefor Radio Astrophysics, TlFR, Pune 411 007, India

Associate Editor: Annapurni Subramaniam Indian Institute of Astrophysics, Bengaluru 560 034, India

Editorial Board

H.M. Antia, Tata Institute of Fundamental Research, Colaba, Mumbai 400 005, India N.M. Ashok, Physical Research Laboratory, Ahmedabad 380 009, India

Matthew Bailes, Swinburne Centre for Astrophysics and Supercomputing, Hawthorn, Victoria 3122, Australia

Anil Bhardwaj, Vikram Sarabhai Space Centre, Trivandrum 695022, India

Sandip K. Chakrabarti, SNBase National Centre For Basic Sciences, Kolkata 700098, and Indian Centrefor Space Physics, Kolkata 700084, India

D.A. Green, Mullard Radio Astronomy Observatory, Cambridge, U'K.

Sunil K. Gupta, Tata Institute of Fundamental Research, Colaba, Mumbai 400 005, India Arun Mangalam, Indian Institute of Astrophysics, Bengaluru 560 034, India

T.R.Seshadri, University of Delhi, Delhi 110 007, India Harinder P. Singh, University of Delhi, Delhi 110007, India

R. Srianand, Inter-University Centrefor Astronomy and Astrophysics, Pune 411 007, India V.Trimble, University of California, Irvine, and Las Cumbres Observatory, USA

Editorial Staff

Sandra Rajiva, Indian Institute of Astrophysics, Bengaluru 560 034, India

ISBN: 978-81-922926-0-1

Publisher: DJ. Saikia, NCRA,TIFR forthe AstronomicalSociety ofIndia

©

2011by theAstronomical Society of India. AllRights Reserved ASI Conference Series - Volume 2, First Edition

Printed inIndiaby Vykat Prints Pvt.Ltd.,Q5, KSSIDC IndustrialArea,Veerasandra2nd Stage, Huskar Road, Benga\uru560099.

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Contents

Preface... IX

Foreword Xl

Organizing Committees XIV

Participants xv

Conference Photograph XIX

I. Facilities and instruments for observing the Sun

Hinode "A new solar observatory in space" .. . . ... . . 1 Saku Tsuneta

I-meter near-infrared solar telescope Z. Liu and J. Xu

9

Optical observational programs at the Indian Institute of Astrophysics Jagdev Singh and B. Ravindra

Introduction to the Chinese Giant Solar Telescope y. y.Deng

19

31

National Large Solar Telescope of India S.S.Hasan

A dual Fabry-Perot based narrow band imager for the National Large. . .. .. 47

Solar Telescope .

B.Ravindra and Ravinder Kumar Banyal

37

Low frequency solar radio astronomy at the Indian Institute of Astrophysics 55

(HA) .

R. Ramesh

SoLEXS - A low energy X-ray spectrometer for solar coronal studies. . .. . . 63 K. Sankarasubramanian, M. C.Ramadevi, Monoj Bug,

C.N. Umapathy, S. Seetha, P. Sreekumar and Kumar

11. From the solar interior to the surface

Solar differential rotation: origin, models and implications for dynamo. ... . 71 L.L.Kitchatinov

Dynamics of active region flux tubes in the solar convection zone

Y.

Fan

81

v

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Dynamo models of the solar cycle: current trends and future prospects ... 91 Dibyendu Nandy

Helicity ofsolar active regions. . . . .... . .. ... . . ... . . . .. ... ... .... . 101 Hongqi Zhang

Parity of solar global magnetic field determined by turbulent

diffusivity 117

H.Hotta and T Yokoyama

Modeling the irregularities of solar cycle using flux transport dynamo

models... 123 Bidya Binay Karak

Back-reactions of dynamo-generated magnetic fields: torsional

oscillations and variations in meridional circulation 131 Amab Rai Choudhuri

Alpha effect due to magnetic buoyancy instability of a horizontal

magnetic layer 137

Piyali Chatterjee

Quenching of the alpha effect in the Sun - what observations are

telling us 143

R. H. Cameron

A physical reconstruction ofsolar magnetic field since 1700 1. liang and D. Schmitt

Hemispheric helicity sign rule and its solar cycle dependence M. Zhang, 1.Hao and C. Y. Wang

Solar cycle variation of network magnetic elements 1.X. Wang and C.L.lin

149

155

163

On the diagnostics of the quiet Sun's magnetic fields: application of the SIR inversion to the full-disk Stokes-meter observations

in 15 spectral lines 169

M. L.Demidov and H.Balthasar

Long-term variation of solar surface differential rotation. . . ... .. . .. 175 L.Zhang, K.Mursula, I. Usoskin, H. Wang and Z.Du

Sunspot seismology: accounting for magnetohydrodynamic wave

processes using imaging spectropolarimetry . . . ... 181 S.P. Rajaguru

Variations in p-mode parameters and sub-surface flows of active

regions with flare activity 189

R. A.Maurya and A.Ambastha

vi

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A study of the north-south asymmetry ofsunspot area during

solar cycle 23 197

Partha Chowdhury and B. N.Dwivedi

Ill. The solar atmosphere and the corona

Modelling magnetic fields in the corona using nonlinear force-free

fields. . ... . . ... . . ... . . ... ... . . . .. . . .. . . .... . 203 M. S. Wheatland and K. D. Leka

The contraction of flare loops and its impact on the solar lower

atmosphere. . . ... . ... . . ... ... . ... . . ... . . . ... . . 213 Haisheng Ji

Alfven waves are easy: mode conversion in magnetic regions p.S. Cally

221

"ElT waves" and coronal mass ejections p.F. Chen and C.Fang

229

Coronal mass ejections and their heliospheric consequences N. Gopalswamy

241

A new view ofcoronal structures: implications for the source and

acceleration of the solar wind . . . ... . . ... . .. . ... . .. . . ... . . 259 S.R. Habbal, H.Morgan and M. Druckmuller

Transient induced MHD oscillations: a tool to probe the solar

active regions 271

Abhishek K. Srivastava, V.M. Nakariakov, B. N.Dwivedi and Pankaj Kumar

Chromospheric evaporation seen in hard X-rays Z. l. Ning

279

Differential coronal rotation and solar activity Satish Chandra and Hari Om Vats

285

Magnetic field configurations leading to solar eruptions Hui Li

291

Multi-wavelength diagnostics of precursor phase in solar flares .. . . .. 297 Arun K.Awasthi and Rajmal lain

Driving mechanism of a failed eruption 307

Y. Guo, M. D.Ding, B.Schmieder, H.Li, T.Torok and T. Wiegelmann

vii

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On the triggering of M-class solar flare due toloop-loop interaction

in ARNOAA 10875 315

Pankaj Kumar; Abhishek K.Srivastava, B. V.Somov, P.K.Manoharan, R. Erdelyi and Wahab Uddin

Study of solar flares and filament interaction in NOAA 10501on

20 November, 2003 323

R.Chandra, B.Schmieder; C.H. Mandrini, P. Demoulin, E.Pariat, T.Toriik, G.Aulanier; W.Uddin and M. G.Linton

MHD simulations of quiescent prominence upflows in the

Kippenhahn-Schliiter prominence model .. . .. . . .. . . . .. ... 331 A. S.Hillier; H.Isobe, K.Shibata and T.E.Berger

SPECIAL SECTION

IV. Growth of solar physics in the Asia-pacific region

Introductory remarks . . . .. .. . ... ... ... ... ... . ... . . .. .. . . . ... . . ... . 339 Amab Rai Choudhuri

History and progress of solar research inChina 343

C. Fang

The early years ofsolar research in Japan E.Hiei

355

Solar physics in India: developments from the nineteenth century

to the present era 367

S.S.Hasan, Amab Rai Choudhuri and S.P. Rajaguru

Recent activities of solar astronomers in Korea 383

K.-S. Cho, 1.Chae, Y.1.Moon and G. S. Choe

Solar physics research in Taiwan. .. . ... . .... .. . . ... .. .. ... .. ... .. .. 393 c.-H. Lin and Dean-Yi Chou

Solar physics research in Australia 397

P.S. Cally, M. S. Wheatland, I.H. Cairns and D.B.Melrose

Ulugh Beg Astronomical Institute of Uzbek Academy of Sciences -

history and current status of solar physics research . . . ... . . 405 Sh. Ehgamberdiev and A. Serebryanskiy

Conference summary: Asia-Pacific region in the world and in astronomy. . . 411 T.Sakurai

Author Index ... .. . ... . . ... . . ... . . . .. .. ... . . .. . .. . ... ... . ... .. .. . 419

viii

References

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