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This paper investigates the relative scintillation level associated with cuspdynamics (including precipitation, flow shears, etc.) with and without theformation of polar cap patches around the cusp inflow region by the EISCATSvalbard radar (ESR) and two GPS scintillation receivers. A series of polar cappatches were observed by the ESR between 8:40 and 10:20 UT on December 3, 2011.The polar cap patches combined with the auroral dynamics were associated with asignificantly higher GPS phase scintillation level (up to 0.6 rad) than thoseobserved for the other two alternatives, i.e., cusp dynamics without polar cappatches, and polar cap patches without cusp aurora. The cusp auroral dynamicswithout plasma patches were indeed related to GPS phase scintillations at amoderate level (up to 0.3 rad). The polar cap patches away from the active cuspwere associated with sporadic and moderate GPS phase scintillations (up to 0.2rad). The main conclusion is that the worst global navigation satellite systemspace weather events on the dayside occur when polar cap patches enter thepolar cap and are subject to particle precipitation and flow shears, which isanalogous to the nightside when polar cap patches exit the polar cap and enterthe auroral oval.

GPS scintillations associated with cusp dynamics and polar cap patches