Our recent studies of rotation and magnetic field near the Sun's surface have indicated that the solar activity may be originating in interference of global torsional MHD oscillations in the Sun. Using theory of dynamics ...

We consider non-conservative Rayleigh scattering in finite atmospheres and study the polarization in the molecular lines both in the transmitted and reflected sunlight. We first investigate the parameterized models to ...

The non-linear stability of an ellipsoidal cluster of stars sharing galactic rotation has been studied. It is seen that the cluster is stable for all densities in the range of linear stability except for those satisfying ...

Following Vrsnak (1990), the observations of an eruptive prominence are analysed. Time evolution of height and velocity of the ascending prominence are measured. The prominence manifested helical structure and many knots. ...

The Lonar lake in Buldhana district of Maharashtra, India, is a meteorite-impact crater. The uniqueness of this crater is that it has been formed in a strata of hard igneous rocks known as basalt rocks. Astronomers compare ...

Following an earlier paper (Pande & Bondal 1991) we have, on the basis of Kippenhahn and Schluter's magnetohydrostatic model of a quiescent prominence, attempted to study the effect of a rotational velocity field in the ...

Positions of comet Swift-Tuttle (1992t)have been measured from photographic plates taken at the Cassegrain focus of the 104-cm telescope of Uttar Pradesh State Observatory (UPSO).

The significance of the binary pulsar 1913+16 in establishing evidence for gravitational radiation emission from binary systems is described. It is pointed out that the system has enabled verification of general relativity ...

A limb monitor was fabricated and used for the observation of seeing conditions at the Solar tower telescope of Kodaikanal observatory. We describe the instrument and report the results obtained on image stability, ...

Quasar absorption lines are an important tool to probe the universe at high redshifts, as they enable us to observe galaxies and intergalactic clouds at large distances, which are virtually inaccessible otherwise. This ...