The centre-to-limb behaviour of the first four lines of the Balmer, Paschen, and Brackett series of atomic hydrogen at selected distances from the line centre, i.e. at delta lamda = 5, 10, 20 and 30 A has been theoretically ...

Time-phase photographic observations with 0.7 Armstrong passband H-alpha filter and the morphological-cum-temporal behaviour of a large double solar flare which occurred on 1981 May 13 have been described. The two strands, ...

We present an analysis which indicates that in several cases coronal holes exist in the vicinity of the active regions producing type II bursts. It is inferred that shock waves which produce type II bursts essentially ...

The status of various applications of speckle interferometry and imaging to the study of solar granulations as well as solar activity is reviewed. The physical aspects of solar granulations are examined, with emphasis on ...

A statistical analysis of time delays between H-alpha and soft x-ray (SXR) emissions at onset and peak respectively during solar flares is presented. We find that at the onset of flares SXR emission starts simultaneously ...