BROADBAND ULF PERTURBATIONS OF THE ELECTRIC FIELD IN COASTAL ZONE OF THE OKHOTSK SEA

• Main Authors: Kopytenko, Yu.A., Ismagilov, V.S., Petrishchev, M.S., Sergushin, P.A., Petlenko, A.V.
• Format: Conference Object
• Language: English
• Published: Кольский научный центр Российской академии наук 2018
• Subjects: Okhotsk; okhotsk sea; Sakhalin
• Online Access: https://dx.doi.org/10.25702/ksc.2588-0039.2018.41.58-60; http://pgia.ru/seminar/archive/2018/Proceedings_2018.pdf#page=59

In September 2017 SPbF IZMIRAN conducted an experiment on the study of ULF electromagnetic disturbances on the coast of the Sea of Okhotsk (Sakhalin Island). Data logging was performed by two geophysical stations GI-MTS-1 located on the coast near the water's edge and at a point remote at 160 m from the coast. It is found that the intensity of broadband (F = 0.001-0.1 Hz) ULF disturbances of the electric field in the coastal zone increases with increasing of the wind speed. This effect was reduced by 3-5 times at the remoted station. Above the Earth's surface, there is ~ 20% excess of positive charges over negative ones in aerosols since the Earth has a negative electrical charge. Probably, the observed ULF disturbances are caused by the displacement of the inhomogeneities of electric charges in aerosols above the electrodes of telluric lines. Concentration of the marine aerosol near the shoreline and, consequently, the concentration of positive charges increases with increasing wind speed and the intensity of ULF disturbances increase too. It was also detected an increasing in the intensity of broadband ULF perturbations of the electric field during tidal periods. The density of the marine aerosol appears to fall strongly when removed from the water's edge. During the seawater tide approaches to the telluric line electrodes installed on the shore and the density of aerosols and charges above the electrodes increases and broadband ULF disturbances are also amplified. At a station remote from the coast, the concentration of aerosols is small and the effect of the influence of the water tides is not observed. The correlation of variations with tides and wind speed is not recorded in a magnetic field at both stations probably due to the insufficient sensitivity of magnetic sensors.