365 citations · 3.4k across the 56 of their papers we have counts for
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Particle-acceleration timescales in TeV blazar flares
Joni Tammi, Peter Duffy
Observations of minute-scale flares in TeV Blazars place constraints on particle acceleration mechanisms in those objects. The implications for a variety of radiation mechanisms ha…
Hard particle spectra from parallel shocks due to turbulence transmission
Joni Tammi
If taken into account, the transmission of the particle-scattering turbulence --in addition to just the particles-- through the shock front can change the effective compression rat…
Particle acceleration by multiple parallel shocks
Joni Tammi, Paul Dempsey
We present both numerical and semi-analytical results on test-particle acceleration in multiple parallel shocks. We apply a kinetic Monte Carlo code and an eigenfunction expansion…
Synchrotron flaring behaviour of CygnusX-3 during the February-March 1994 and September 2001 outbursts
E. J. Lindfors, M. Türler, D. C. Hannikainen +4
Aims: In this paper we study whether the shock-in-jet model, widely used to explain the outbursting behaviour of quasars, can be used to explain the radio flaring behaviour of the…
Turbulence transmission in parallel modified shocks using ray tracing
Joni Tammi, Rami Vainio
We apply a semi-classical approach of handling waves as quasiparticle gas in a slowly varying flow -- analogous to ray tracing -- to calculate the Alfven wave transmission paramete…