Preface

233

Guest Editorial
Wahab Uddin & P K Manoharan

235

Simulation and characterization of trajectories in Sun-Jupiter-Comet system
M K Das, Pankaj Narang, M Yuasa & L M Saha

237

Ground level enhancement events of Solar cycle 23
N Gopalswamy, H Xie, S Yashiro & I Usoskin

240

Current sheet of 4 November 2003 flares
J C Raymond&A Ciaravella

249

Effect of solar wind speed variations on other interplanetary parameters
Vidya Charan Dwivedi, V S Pandey , D P Tiwari & S P Agrawal

252

Solar wind-magnetosphere-ionosphere coupling: Pi2 observations
A K Sinha, P Vohat& B M Pathan

257

Characteristic features of ICMEs associated with big storms in geomagnetic activity and large Forbush decreases in cosmic ray intensity
V Gupta, Y P Singh & Badruddin

265

Characteristics of interplanetary CMEs observed by Ulysses
A Dickson Benjamin & S R Prabhakaran Nayar

270

Propagation characteristics of coronal mass ejections and their effects at the near-Earth environment
A Mujiber Rahman, P K Manoharan & S Umapathy

276

Coronal heating by coupling of the magnetosonic and phase-mixed Alfvén waves
Manish K Pandey, Lalan Prasad & Suman Gariya

280

Study of geomagnetic storms with Dst < -100nT during 1999 – 2002
Santosh Kumar & Amita Raizada

284

Ionospheric response to the space weather event of 18 November 2003 - An investigation
Pankaj Kumar, Wahab Uddin, Alok Taori, Ramesh Chandra & Shuchi Bisht

290

Ionospheric modulations due to solar flares over Ahmedabad
Som Sharma, H Chandra, Hari Om Vats, N Y Pandya & Rajmal Jain

296

F-region variability over the anomaly crest region
H Chandra, Som Sharma & Soe Win Aung

302

Variation of Schumann resonance frequency observed at Allahabad (Lat 22⁰N, Long 81.51⁰E)
S Hazra, A K Sinha & B M Pathan

308

Influence of solar variability on rainwater
Indira Sudhir Joshi

312

A Dual beam Hα Doppler system to acquire, analyse and anticipate solar eruptive events directed towards Earth
Anand D Joshi, Shibu K Mathew, Nandita Srivastava, Sara F Martin & Sudhir Kumar Gupta

315

Solar Vector Magnetograph: Instrument status and vector field measurements of non-flaring solar active regions
Sanjay Gosain & P Venkatakrishnan

319

Study of upper atmospheric emissions using Mesosphere Lower Thermosphere Photometer (MLTP) designed at ARIES
T Bangia, S Bhattacharjee , A Guharay, A Taori & Wahab Uddin

325