Intense outbursts in blazars are among the most extreme phenomena seen in
extragalactic objects. Studying these events can offer important information
about the energetic physical processes taking place within the innermost
regions of blazars, which are beyond the resolution of current instruments.
This work presents some of the largest and most rapid flares detected in the
optical band from the sources 3C 279, OJ 49, S4 0954+658, Ton 599, and PG
1553+113, which are mostly TeV blazars. The source flux increased by nearly ten
times within a few weeks, indicating the violent nature of these events. Such
energetic events might originate from magnetohydrodynamical instabilities near
the base of the jets, triggered by processes modulated by the magnetic field of
the accretion disc. We explain the emergence of flares owing to the injection
of high-energy particles by the shock wave passing along the relativistic jets.
Alternatively, the flares may have also arisen due to geometrical effects
related to the jets. We discuss both source-intrinsic and source-extrinsic
scenarios as possible explanations for the observed large amplitude flux
changes.Comment: 8 pages, 2 figures, 38th International Cosmic Ray Conference
(ICRC2023) proceeding