During my talk I intend to present a few research projects performed in my High Energy Astrophysics Department in Astronomical Observatory of the Jagiellonian University. The first study analyses the Gamma Ray Burst X-ray light curve decay indices. We show a new result that there is relation between such index and the afterglow characteristic luminosity. The second presented project involves analysis of optical observations of a TeV blazar. We show that emission of an hour scale microflare analysed separately from the slowly varying component is highly (40-60%) polarized. The third topic presents study, using our measurements of extremely low frequency electromagnetic waves, of the solar flare influence on the resonance cavity formed by the Earth surface and the ionoshpere. Depending on involved ionizing radiations or accompanying cosmic ray particles penetrating the atmosphere, the basic 8 Hz resonance frequency of the cavity can be increased or decreased. Then, if time allows, I will shortly present a current status of the Cherenkov Telescope Array (CTA) project for TeV astronomy and a progress with main Polish instrumental contributions to it.
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