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The most peculiar radio characteristics of the TeV emitting high-mass X-raybinary LS I +61{\deg}303 are two periodicities: A large periodic outburst whichexhibits the same period as the orbit (phase \Phi) and a second periodicity of1667 days (phase \Theta) which modulates the orbital phase and amplitude of thelarge outburst. Recent analysis of the radio spectral index present strongevidence for the presence of the critical transition from optically thickemission (related to a steady jet) to an optically thin outburst (related to atransient jet) as in other microquasars. In parallel, a switch from a low/hardX-ray state to a transitional state (e.g. steep power law state) would beexpected. We show how the critical transition from optically thick emission toan optically thin outburst is modulated by \Theta. Folding over a too large\Theta-interval mixes up important information about the outbursts and canyield a false picture of the emission behaviour of the source along the orbit.We therefore analyse the implications of this long period for treatment of hardX-ray/high energy data obtained from LS I +61{\deg}303, e.g. with Fermi-LAT orINTEGRAL, taking into account this long-term periodicity.

Analysis of hard X-ray/high energy data from LS I +61{\deg}303 based on implications from its 4.6 yr periodicity