Moscow, Russian Federation
Schmidt Institute of Physics of the Earth, RAS
Geophysical Center RAS
Moscow, Russian Federation
A.M. Obukhov Institute of Atmospheric Physics RAS
Moscow, Russian Federation
Moskva, Russian Federation
UDK 53 Физика
UDK 55 Геология. Геологические и геофизические науки
Strong meteorological disturbances in the atmosphere, accompanied by the generation of waves and turbulence, can affect ionospheric plasma and geomagnetic field. To search for these effects, we have analyzed electromagnetic measurement data from low-orbit Swarm satellites during flights over the typhoon Vongfong 2014. We have found that there are “magnetic ripples” in the upper ionosphere that are transverse to the main geomagnetic field fluctuations of small amplitude (0.5–1.5 nT) with a predominant period of about 10 s caused by small-scale longitudinal currents. Presumably, these quasiperiodic fluctuations are produced by the satellite’s passage through the quasiperiodic ionospheric structure with a characteristic scale of ~70 km induced by the interaction of acoustic waves excited by the typhoon with the E-layer of the ionosphere. In one of the flights over the typhoon, a burst of high-frequency noise (~0.3 Hz) was observed, which can be associated with the excitation of the ionospheric Alfven resonator by atmospheric turbulence.
tropical cyclone, ionosphere, geomagnetic field, acoustic waves, Swarm satellites, longitudinal current
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