DR. GIRJESH GUPTA

One of the most persistent problem in the solar and space physics is the identification of mechanism that heats the solar corona and accelerates the fast solar wind. Magneto-hydrodynamic (MHD) waves and magnetic reconnection are currently the most promising heating models. In this talk, focus will be mainly on several small-scale transient events such as jets, explosive events (EEs), and blinkers observed in the solar atmosphere with imaging and spectroscopic instruments. These features are observed on the length-scale of 103 to 104 km and life time of few minutes with several other observational properties. During the EEs, several absorption features were found on the top of highly broadened line profiles, which indicate that these events were occurring within the cooler atmosphere. Waves were found to play an important role in the triggering of these events. Obtained results suggest that these features are observational signatures of small-scale magnetic reconnections occurring in the lower atmosphere as seen from continuously evolving photospheric magnetic field underneath. Energy released during the events will be important for the heating of upper solar atmosphere.