The Scientific background:
The temperature in the solar corona rises to million degrees from about 5700 degrees at the photospheric level. Some models have been proposed to explain the heating of solar corona but the existing models are unable to explain all the physical and dynamical properties of the solar corona. It has been recognized that magnetic fields play an important role in heating up the plasma in the solar corona but identification of the process or processes still remains an open question. It has been proposed that occurrence of micro or nano flares at the surface of the sun can create shock waves and contribute to the heating of solar corona but some have argued that these waves get dissipated in the chromosphere itself and cannot reach the corona. Other type of waves such as fast or slow mode magneto-hydrodynamic waves have been proposed and these are expected to cause intensity and velocity oscillations in the solar corona in the range of 1 Hz and lower frequencies. Many attempts have been made to detect these oscillations but the results are contradictory. A large number of small-scale reconnections have also been proposed to explain the heating of solar corona. Another way to heat the solar corona is to generate waves through turbulence (acoustic waves). The existence of non-thermal motion in the solar corona and its variation with height has also been interpreted to cause heating of the plasma in the solar corona.