Sunset Variations of the Bottom Edge of the Ionosphere During the Proton Precipitations on and After 29 September, 1989

  • G. F. RemenetsEmail author
  • M. I. Suhovey
  • V. A. Shishaev
Conference paper
Part of the Springer Proceedings in Earth and Environmental Sciences book series (SPEES)


One of the most powerful solar proton precipitations (SPP), which began on 29 September 1989, was at the same time the longest one. This peculiarity gave to us the possibility to study on the base of VLF data the precipitation effect during a sunset on the dynamics of the electric properties of the lowest part of the ionosphere in the terms of complex reflection coefficient for a sequence of 8 days. The input data for the analysis were the relative variations of amplitudes and variations of phases for 3 VLF monochromatic, ground based signals with radio path North Norway—Kola Peninsula having a moderate length, 885 km. A self-consistent method for solution of an inverse VLF problem was used. The sunset dynamics of electric conductivity of the temporally modified bottom ionosphere was stated for all days of the SPP. The solution of such inverse VLF problem was possible due to the multi frequency measurements for the radio path and the synchronous registration of amplitudes and phases.


Proton precipitation on 29 September 1989 Sunset effect Inverse VLF problem Self-consistent method 


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© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • G. F. Remenets
    • 1
    Email author
  • M. I. Suhovey
    • 1
  • V. A. Shishaev
    • 2
  1. 1.Saint-Petersberg State UniversitySaint-PetersburgRussia
  2. 2.Polar Geoghysical InstituteApatity, Murmansk Reg.Russia

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