Correlation of very low and low frequency signal variations at mid-latitudes with magnetic activity and outer-zone particles
- 1Institute of Physics of the Earth, Russian Academy of Sciences, 10 B. Gruzinskaya, Moscow, 123995, Russia
- 2Space Systems Laboratory, Department of Automatic Control and Systems Engineering, University of Sheffield, Sheffield, S1 3JD, UK
- 3University of Electro-Communications, Advanced Wireless Communications Research Center, 1-5-1 Chofugaoka, Chofu Tokyo, 182-8585, Japan
- 4Space Research Institute, Austrian Academy of Sciences, 6 Schmiedlstraße, 8042, Graz, Austria
- 5Institute of marine geology and geophysics Far East Branch of Russian Academy of Sciences, 1B Nauki str., Yuzhno-Sakhalinsk, 693022, Russia
Abstract. The disturbances of very low and low frequency signals in the lower mid-latitude ionosphere caused by magnetic storms, proton bursts and relativistic electron fluxes are investigated on the basis of VLF–LF measurements obtained in the Far East and European networks. We have found that magnetic storm (−150 < Dst < −100 nT) influence is not strong on variations of VLF–LF signals. The anomalies with negative amplitude were registered during the main and recovery phases for several magnetic storms (mainly for three northernmost paths). The correlation between VLF–LF signals and geomagnetic activity is rather weak even for these paths (≈ 12–18%). Also, the correlation between magnetic activity and VLF signal variations recorded onboard the DEMETER satellite is not found. The significant influence of outer-zone particles (energetic particle sensor on board/Geostationary Operational Environmental Satellite (GOES) measurements) on the VLF–LF signal variations is found for almost half of the sub-ionospheric paths.