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N.V. Semenova Polar Geophysical Institute, Apatity, Russia.

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Presentation on theme: "N.V. Semenova Polar Geophysical Institute, Apatity, Russia."— Presentation transcript:

1 N.V. Semenova Polar Geophysical Institute, Apatity, Russia

2 Examples of Spectral Resonance Structure (SRS) observed in Sodankyla Geophysical Observatory (L ~ 5.2) during two successive days

3 Examples of SRS observed at Crete (Greece, L~1.3 ) during three successive days

4 Examples of SRS observed in Barentsburg (Spitsbergen, L~15.2) during two successive days

5 Generation of the Ionospheric Alfven Resonator (IAR) After Belyaev et al. (1985)

6 The existence of the IAR causes resonance features of the ionosphere reflection coefficient  F 1  F 2

7 Dependence of the frequency interval of IAR (  F) on ionospheric parameters The theory of IAR predicts dependence of the SRS characteristics on parameters of upper ionosphere

8 Morphological features of the Spectral Resonance Structures at mid-latitudes Morphological features of the Spectral Resonance Structures at mid-latitudes Nizhny Novgorod

9 Examples of magnetic variation spectra observed at mid- latitude in the nighttime and daytime in the years of solar activity minimum

10 The total number of observation days in half-year intervals Probability of the SRS observation in 6-month intervals during the solar activity cycle Variation of the number of sunspots during the solar activity cycle averaged over 6 months

11 Morphological features of the Spectral Resonance Structures at high latitudes Sodankyla Geophysical Observatory

12 Examples of Spectral Resonance Structure observed in Sodankyla Geophysical Observatory during two successive days

13 The SRS frequency interval (  F) depends on interval (  F) depends on: local time season season solar activity solar activity

14 The SRS occurrence rate depends on: local time local time season season solar activity solar activity

15 Morphological features of the Spectral Resonance Structures at low latitudes Island of Crete, Greece

16 Examples of SRS observed at Crete (Greece, L~1.3 ) during three successive days

17 Dependence of SRS occurrence rate and frequency interval on UT

18 Mixed SRS  F 2  F 1

19 Morphological features of the Spectral Resonance Structures at high latitudes Morphological features of the Spectral Resonance Structures at high latitudes Barentsburg, Spitsbergen

20 Examples of SRS observed in Barentsburg (Spitsbergen, L~15.2) during two successive days

21 The number of observation days and probability of SRS observation as a function of season

22 Dependence of the  F on season

23 The example of simultaneous observations of SRS in Lovozero and Barentsburg 10 October 2003

24 The example of simultaneous observations of SRS in Lovozero and Barentsburg 11 October 2003

25 Model ionospheric profiles and calculated reflection coefficients for different conditions

26 Comparison of the observed and calculated SRS frequencies

27 Future plans

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