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Blazars are a subclass of AGN and flaring in multi-TeV gamma-ray seems to bethe major activity in high energy blazars a subgrup of blazars. Flaring is alsounpredictable and switches between quiescent and active states involvingdifferent time scales and fluxes. While in some high energy blazars a strongtemporal correlation between X-ray and multi-TeV gamma-ray has been observed,outbursts in some other have no low energy counterparts and explanation of suchextreme activity needs to be addressed through different mechanisms as it isnot understood well. The extragalactic background light (EBL) plays animportant role in the observation of these high energy gamma-rays as itattenuates through pair production of electron-positron and also changes thespectral shape of the high energy photons. In the context of the photohadronicmodel and taking EBL correction into account, flaring can be explained verywell. In a series of papers we have developed this model to explain multi-TeVflaring events form many blazars. Here in this review, the photohadronic modelis discussed and applied to explain the multi-TeV flaring from nearby highenergy blazars: Markarian 421, Markarian 501 and 1ES1959+650.

Multi-TeV flaring in nearby High Energy Blazars: A photohadronic scenario