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Upper panel: ALTEA minute-averaged particle flux between the 8th and 23rd of May. All the typical particle flux modulations, due to the ISS passing into different geomagnetic cutoff regions, are shown: pole-equator 90-min oscillations, SAA passages (highest peaks) and longitude effect (24 h low frequency modulation due to orbit precession). Lower panel: Particle flux detail of May 17th, 2012 SPE flux increase over the poles: labelled S for south pole and N for north pole. Time on the x axis is UT.
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