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Origin of magnetic fields, its structure and effects on dynamical processesin stars to galaxies are not well understood. Lack of a direct probe hashampered its study. The first phase of Square Kilometre Array (SKA-I), willhave more than an order of magnitude higher sensitivity than existing radiotelescopes. In this contribution, we discuss specific science cases that are ofinterest to the Indian community concerned with astrophysical turbulence andmagnetic fields. The SKA-I will allow observations of a large number ofbackground sources with detectable polarisation and measure their Faradaydepths (FDs) through the Milky Way, other galaxies and their circum-galacticmedium. This will probe line-of-sight magnetic fields in these objects well andprovide field configurations. Detailed comparison of observational data withmodels which consider various processes giving rise to field amplification andmaintenance will then be possible. Such observations will also provide thecoherence scale of the fields and measure its random component. Measuring therandom component is important to characterise turbulence in the medium.Observations of FDs with redshift will provide important information onmagnetic field evolution as a function of redshift. The background sourcescould also be used to probe magnetic fields and its coherent scale in galaxyclusters and in bridges formed between interacting galaxies. Other than FDs,sensitive observations of synchrotron emission from galaxies will providecomplimentary information on their magnetic field strengths in the sky plane.The core shift measurements of AGNs can provide more precise measurements ofmagnetic field very close (<pc) to the black hole and its evolution. The lowband of SKA-I will also be useful to study circularly polarized emission fromSun and comparing various models of field configurations with observations.

Probing magnetic fields with Square Kilometre array and its precursors