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A Coronal Mass Ejection was associated to the solar flare occurred on September 6th 2017, which produced a significant impact in the EGNOS performance on the two following days, the 7th and 8th of September. If we focus on September 8th, the values of geomagnetic index Kp and rate of TEC index can perfectly match with the EGNOS availability degradation in the North of Europe. The analysis showed that the EGNOS degradation is linked to the GPS L2 loss of lock by some receivers in the North caused by a high TEC gradients produced by the impact of the CME in the upper atmosphere. Additionally, does this CME generate any other type of irregularity in the ionosphere (e.g. TID)?
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This event has been deeply studied by Mission Performance team at ESSP who investigated the reason of this degradation. ( the link to the article can be found here ) In the month of February 2014 the high solar activities have been observed which had significant impact on EGNOS system. It has been observed that North part of Europe has been the most influenced by this event. In this particular day, the degradation has started at 1700 UTC and followed on 28th until 0200 UTC. It has been proved that the geomagnetic activity which disturbed the EGNOS system was related to the coronal mass ejection associated to a X4.9 flare erupted from the Sun at 0049 UTC on February 25th. Is this degradation was caused by TID activity which occurred at this time?