We have obtained the Calcium K-line profiles, on daily basis, at all latitudes, while integrating the spectrum over the visible longitudes of the Sun by moving a ~340 mm solar image at a uniform speed in the E-W direction ...

We have analyzed the Ca-K images obtained at Kodaikanal Observatory as a function of latitude and time for the period of 1913 - 2004 covering Solar Cycles 15 to 23. We have classified the chromospheric activity into plage, ...

We have analyzed the variations in shear angle over a time interval of 30 s during a flare on June 11, 1991, using Kodaikanal Observatory spectroheliogram and photoheliogram data, and assuming H-alpha filaments are a proxy ...

A detailed analysis of an off-limb polar region observed over a number of weeks by the Coronal Diagnostic Spectrometer (CDS), on board the SOHO spacecraft, is presented. Form a measurement of a number of coronal lines we ...

Linear polarization measurements of the R Aqr system are reported here. The R Aqr system shows strong wavelength dependence of percent polarization and position angle, which are strongly time dependent also. There is a ...

We present group velocity dispersion results from a study of regional fundamental mode Rayleigh waves propagating across the Indian region. 1-D, path-averaged dispersion measurements have been made for 1001 source-receiver ...

The Ca ii K spectroheliograms spanning over a century (1907–2007) from Kodaikanal Solar Observatory, India, have recently been digitized and calibrated. Applying a fully automated algorithm (which includes contrast enhancement ...

The analysis of the Ca-K line spectra as a function of latitude and integrated over the visible disk obtained during the period of 1989–2011 at the Kodaikanal Solar Tower Telescope shows that the FWHM of the K1 distribution ...