S. M. Chitre
Articles written in Journal of Astrophysics and Astronomy
Volume 1 Issue 2 December 1980 pp 165-175
The characteristics of the most unstable fundamental mode and the first harmonic excited in the convection zone of a variety of solar envelope models are shown to be in reasonable agreement with the observed features of granulation and supergranulation.
Volume 3 Issue 4 December 1982 pp 413-418
The process of coherent and incoherent protonn cyyclotron emission occurring near the polar regions of a strongly magnetic accreting neutron star is considered. The soft X-ray flux resulting from the incoherent emission process is calculated for application to Her X-1 and also to gamma ray bursts, a consequence of which is that gamma ray bursts will be accompanied by soft X-ray bursts.
Volume 5 Issue 4 December 1984 pp 495-506
Over the past fifteen years, observations of some quasars with the techniques of very-long-baseline interferometry have shown that the angular separation between pairs of radio-emitting regions in their cores is increasing year after year. If the quasars are indeed as far away as implied by Hubble’s law, then these angular motions translate into linear speeds several times the speed of light. Several theoretical scenarios have been proposed to show that the observed motions are illusory. The leading contender in this field — the relativistic beam model — and an alternative offered by the concept of a gravitational screen are described and compared in the light of recent observational data.
Volume 14 Issue 3-4 December 1993 pp 121-129
The straight arc in the galaxy-cluster Abell 2390 is investigated in the framework of a gravitational lens model that invokes a single background source galaxy. An extended source galaxy at a redshift of 0.913 is being marginally lensed by the foreground X-ray cluster of galaxies at a redshift of 0.231. It is demonstrated that a single lensed galaxy lying on or very near to the lip caustic of the cluster lens is capable of reproducing the linear morphology with the observed breaks.
Volume 21 Issue 3-4 September 2000 pp 331-337
The interior of the Sun is not directly accessible to observations. Nonetheless, it is possible to infer the physical conditions inside the Sun with the help of structure equations governing its equilibrium and with the powerful observational tools provided by the neutrino fluxes and oscillation frequencies. The helioseismic data show that the internal constitution of the Sun can be adequately represented by a standard solar model. It turns out that a cooler solar core is not a viable solution for the measured deficit of neutrino fluxes, and the resolution of the solar neutrino puzzle should be sought in the realm of particle physics.
Volume 21 Issue 3-4 September 2000 pp 343-347
The observed splittings of solar oscillation frequencies can be utilized to study possible large-scale magnetic fields present in the solar interior. Using the GONG data on frequency splittings an attempt is made to infer the strength of magnetic fields inside the Sun.
Volume 40 | Issue 5
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