We describe the development of compact, lightweight payloads suitable for ground, space, and balloon-based observatories. The first instrument is a compact high resolution (≥ 20000) tunable spatial heterodyne spectrom- eter ...

The surface of the Sun and solar-type stars is permeated by magnetic fields with a va- riety of spatial and temporal scales. The spatial scales range from sub-arcsec tangled fields that are yet to be observed (inaccessible ...

Flux variability is one of the defining characteristics of active galactic nuclei (AGN). This has been known over the past six decades ever since the discov- ery of quasars in 1963. Since then AGN have been observed ...

This thesis is aimed at studying dual nuclei in galaxies using radio and UV observations. Dual nuclei are formed during galaxy mergers in our Universe. Since we know that almost all nearby galaxies host a super-massive ...

The study of magnetic fluxtubes is a very important aspect as it plays an important role in several astrophysical phenomena in the solar atmosphere. Thus, it is very important to understand the properties and structures ...

Supernovae (SNe) are explosive transient events that mark the end stage of stellar evolution. This work presents a study of low redshift, hydrogen deficient (Type I) SNe, with emphasis on SNe of type Ia. The data were ...

The various features on the solar surface like sunspots, plages, network, active network play a main role in the solar variability. This thesis uses observations which were started in an effort to delineate the role of ...

The research work presented in this thesis is aimed to provide a detailed under- standing of the radiative processes powering the jets of the blazars, a class of AGNs with jet pointed towards the line of sight to the ...

Before setting up any large observational facility, selection of a suitable site is an important task. It requires a variety of site survey instruments, which helps to carry out a detailed comparative study of candidate ...

The radio telescopes that are presently in operation specifically to study the Sun are limited. We have: (1) the Nobeyama radioheliograph in Japan operating at 17 and 34 GHz; (2) the Nan¸cay radioheliograph in France ...