2018/05/06 by A. V. Guglielmi, Guglielmi, A. V., O. V. Kozyreva +1
Physics and Astronomy · #FOS: Physical sciences #Geophysics (physics.geo-ph) #physics.geo-ph
paper · pdf · doi:10.48550/arxiv.1805.02256
9 pages, 2 figures
arxiv created 2018/05/06 · arxiv updated 2018/05/08
Ultra-low-frequency (ULF) oscillations of the magnetospheric cusps are observed permanently in the near-mid sector of auroral oval in the form of so-called IPCL. In this paper, we posed the question: do electromagnetic waves incident on cusp from the foreshock (it is a special region of cosmic plasma existing before the front of the magnetosphere) affect the IPCL regime? We have proposed a method of experimental investigation, which is based on the idea of the foreshock position dependence on the interplanetary magnetic field (IMF) orientation. A hypothesis has been put forward on the existence of a specific effect of the IPCL north-south asymmetry. We tested our hypothesis using IPCL observation data from the Hornsund (Spitsbergen) and Davis (Antarctica) observatories. We found confirmation of the hypothesis at a high confidence level of statistical significance. Keywords: magnetosphere, ultra-low-frequency oscillations, north-south asymmetry.