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Morphological features of the spectral resonance structures at different latitudes

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This study investigates the morphological features of Spectral Resonance Structures (SRS) observed at various latitudes, including high (Sodankyla, Barentsburg), mid (Nizhny Novgorod), and low latitudes (Crete). Detailed examples highlight the variability of SRS characteristics induced by local time, season, and solar activity across different observational scenarios. It includes analyses of magnetic variation spectra during solar minimum periods and the dynamics of ionospheric parameters. The findings contribute to understanding the ionospheric Alfvén resonator's role in shaping these resonance structures and their frequency dependencies.

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Morphological features of the spectral resonance structures at different latitudes

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  1. Morphological features of the spectral resonance structures at different latitudes 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 atCrete (Greece, L~1.3) during three successive days

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

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

  6.  F1  F2 The existence of the IAR causes resonance features of the ionosphere reflection coefficient

  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 Structuresat mid-latitudesNizhny 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 Variation of the number of sunspots during the solar activity cycle averaged over 6 months Probability of the SRS observation in 6-month intervals during the solar activitycycle

  11. Morphological features of the Spectral Resonance Structuresat 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: • local time • season • solar activity

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

  15. Morphological features of the Spectral Resonance Structuresat low latitudes Island of Crete, Greece

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

  17. Dependence of SRS occurrence rate and frequency interval on UT

  18.  F1  F2 Mixed SRS

  19. Morphological features of the Spectral Resonance Structuresat high latitudesBarentsburg, Spitsbergen

  20. Examples of SRS observed inBarentsburg (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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