Articles | Volume 12
Adv. Radio Sci., 12, 261–266, 2014
https://doi.org/10.5194/ars-12-261-2014
Adv. Radio Sci., 12, 261–266, 2014
https://doi.org/10.5194/ars-12-261-2014

  11 Nov 2014

11 Nov 2014

Probability of occurrence of planetary ionosphere storms associated with the magnetosphere disturbance storm time events

T. L. Gulyaeva1, F. Arikan2, and I. Stanislawska3 T. L. Gulyaeva et al.
  • 1IZMIRAN, Kaluzskoe Sh. 4, Troitsk, Moscow, 142190, Russia
  • 2Department of EEE, Hacettepe University, Beytepe, Ankara 06800, Turkey
  • 3Space Research Center, PAS, Barticka 18-A, Warsaw, Poland

Abstract. The ionospheric W index allows to distinguish state of the ionosphere and plasmasphere from quiet conditions (W = 0 or ±1) to intense storm (W = ±4) ranging the plasma density enhancements (positive phase) or plasma density depletions (negative phase) regarding the quiet ionosphere. The global W index maps are produced for a period 1999–2014 from Global Ionospheric Maps of Total Electron Content, GIM-TEC, designed by Jet Propulson Laboratory, converted from geographic frame (−87.5:2.5:87.5° in latitude, −180:5:180° in longitude) to geomagnetic frame (−85:5:85° in magnetic latitude, −180:5:180° in magnetic longitude). The probability of occurrence of planetary ionosphere storm during the magnetic disturbance storm time, Dst, event is evaluated with the superposed epoch analysis for 77 intense storms (Dst ≤ −100 nT) and 230 moderate storms (−100 < Dst ≤ −50 nT) with start time, t0, defined at Dst storm main phase onset. It is found that the intensity of negative storm, iW-, exceeds the intensity of positive storm, iW+, by 1.5–2 times. An empirical formula of iW+ and iW- in terms of peak Dst is deduced exhibiting an opposite trends of relation of intensity of ionosphere-plasmasphere storm with regard to intensity of Dst storm.

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