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Using GPS dual-frequency observations collected by continuously operating\udGPS tracking stations in China, superimposed disturbances caused by the\udintegrated action of spacecraft's physical effect and chemical effect on\udionosphere during the launches of the spacecrafts Tiangong-1 and Shenzhou-8\udin China were firstly determined. The results show that the superimposed\uddisturbance was composed of remarkable ionospheric waves and significant\udionospheric depletion emerged after both launches. Meanwhile, we found\udfor the first time that the ionospheric waves were made up of two periods of\udwave by wavelet analysis. The first period of ∼ 4 min shows\udone event in the near stations and two sub-events in the few far stations.\udThe second period of ∼ 9 min shows only one event in all the\udobserved stations. Finally, the time characteristics for ionospheric waves\udand depletions were examined

Superimposed disturbance in the ionosphere triggered by spacecraft launches in China