###### Abstract
Based on multi instruments on ground and satellites, [PERSON] et al. [12] revealed the dusk equatorial plasma bubbles, due to the penetration electric field, during the severe geomagnetic storm on 22-23 June 2015, at the altitudes from \(\sim\)350 km to \(\sim\)850 km in the topside ionosphere. By using the dayside multi parameters from satellites of CHAMP, ROCSAT, and DMSP, [PERSON] et al. [16] found the rapid upward drift of plasma in the topside ionosphere at the main phase of positive storms due to the eastward prompt penetrating electric field. [PERSON] et al. [17] reported the first observational evidence for simultaneous westward and eastward zonal electric fields at equatorial E and F altitudes in local daytime during 14-15 November 2006, which caused the westward electrojet in the E region, and reinforced the equatorial anomaly in the F region, even to the topside ionosphere at DEMETER satellite altitude of 660 km. [PERSON] et al. [18] presented a quantitative simulation to explain the storm-enhanced plasma density in the ionospheric tails. [PERSON] et al. [19] gave a model simulation about the storm on 15 July 2000, and they found that only penetration of a strong electric field at middle and low latitudes can explain the TEC enhancement in the evening. Due to the complicated characteristics in the coupling mechanism from the magnetic storm on the ionosphere and magnetosphere, many questions still remain in this research domain, besides the urgent requirements for theoretical models. On 25-26 August 2018, a quiet solar activity year, a strong magnetic storm occurred, which aroused the interests of scientists. [PERSON] and [PERSON] [20] studied ionospheric responses in the European sector by using the parameters of foF2 and GNSS TEC, combing with satellite electron density, to illustrate the ionospheric dynamics. [PERSON] and [PERSON] used foF2, hnrZ, and TEC to investigate the characteristics in the South American sector, and they illustrated that thermosphere neutral composition was the main cause for the positive effects during the recovery phase [21]. [PERSON] et al. verified the double-humped increase at a middle latitude in the American sector and fountain effects in the low latitudes in the Asian-Australian sector and American sector from observations of GNSS TEC [22]. Combining the observations ground-based geomagnetic field and satellite magnetic field and electron density from CSES, [PERSON] et al. identified the principal magnetospheric current system during the different phases of the geomagnetic storm [23]. [PERSON] et al. studied the ionospheric disturbances and irregularities during this geomagnetic storm on the basis of ground-based GNSS, SuperDARN, ionosondes, and satellites, including Swarm, CSES, and DMSP, and they demonstrated the positive ionospheric response in the Asian region driven by \(E\times B\) drift during the main phase and small scale irregularities in the American region at mid and high latitudes [24]. By using GNSS ROTI and satellites of Swarm and DMSP, [PERSON] and [PERSON] found the development of equatorial ionospheric irregularities extending to 25\({}^{\circ}\) magnetic latitude and northwest transportation of plasma depletions across midlatitudes [25]. In this paper, the multi measurements were collected from scientific payloads onboard Chinese CSES satellite and the ionospheric disturbances and their interactions were analyzed around the biggest magnetic storm on 25-26 August in the first operating year of CSES of 2018. Combined with other observations, the whole spatio-temporal evolutional processes were investigated, and the ionospheric response characteristics to this event were demonstrated.