Swarm is a three-satellite mission operated by the European Space Agency to monitor the Earth's magnetic field. The China Seismo Electromagnetic Satellite (CSES) is a satellite dedicated to studying the possible seismo-induced effects of seismic activity on the ionosphere, operated by the China National Space Administration in cooperation with the Italian Space Agency. Such satellites are placed in Low Earth Orbit at an altitude ranging from 460 km to 510 km.

We selected orbital combinations with the Swarm satellite in one hemisphere and CSES-01 in the opposite one to study the impact of magnetic pulsations on the ionospheric environment. We identified three orbital combinations: two of them closer to the equator and another one at higher latitudes. The data have been filtered in the frequency range of Pi2 pulsations (period between 40 s and 150 s). We inspected the filtered data in time and frequency domains, as time series and scalograms, respectively. Similar oscillations of a few nanoteslas of the magnetic field intensity were detected by both satellites, sometimes in phase and at other times in counterphase. Detected oscillations could be explained by interactions between the Sun's and Earth's magnetic fields or the effect of a satellite crossing the auroral ring currents at the Northern and Southern poles.

This work supports the cross-validation of magnetic data from multiple satellite missions in Low Earth Orbit, such as Swarm and CSES. Our results confirm the scientific reliability of magnetic data acquired from the above-cited satellite missions.