International collaborations

• Principal investigator (2001-05) Indo-French project with Observatoire de Paris on Dynamics of Solar & Stellar Interiors: Seismology & Activity, (Report:pdf file)

• Echelle Spectropolarimeter for the 2-m Hanle Chandra Telescope (Proposal: pdf file, dated: October 2005)
  

• Heidelberg University (2003)
  

• Principal investigator (1994-2001) Indo-US project with Harvard University on Structure, Dynamics & Heating of the Solar Atmosphere

• High Altitude Observatory, Boulder on Interaction of p-modes with magnetic fields

• Göttingen Observatory (1990-95) on Nonlinear effects in magnetic flux tubes

• Queen Mary & Westfield College, London (1985-87) on Energy transport in the solar atmosphere

• Department of Theoretical Physics, Oxford University (1985) on Waves in magnetic flux tubes

• Kiepenheuer Institute, Freiburg (1983-85) on Instability, convective collapse and heating of magnetic flux tubes