Morphological features of the spectral resonance structures at different latitudes
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Morphological features of the spectral resonance structures at different latitudes. N.V. Semenova Polar Geophysical Institute, Apatity, Russia. Examples of Spectral Resonance Structure (SRS) observed in Sodankyla Geophysical Observatory (L ~ 5.2) during two successive days.

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Morphological features of the spectral resonance structures at different latitudes

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Morphological features of the spectral resonance structures at different latitudes

N.V. Semenova

Polar Geophysical Institute, Apatity, Russia


Examples of Spectral Resonance Structure (SRS) observed in

Sodankyla Geophysical Observatory (L ~ 5.2) during two successive days


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


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


Generation of the Ionospheric Alfven Resonator (IAR)

After Belyaev et al. (1985)


 F1

 F2

The existence of the IAR causes resonance features of the ionosphere reflection coefficient


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


Morphological features of the Spectral Resonance Structuresat mid-latitudesNizhny Novgorod


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


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


Morphological features of the Spectral Resonance Structuresat high latitudes Sodankyla Geophysical Observatory


Examples of Spectral Resonance Structure observed in

Sodankyla Geophysical Observatory during two successive days


  • The SRS frequency

  • interval (F) depends on:

  • local time

  • season

  • solar activity


  • The SRS occurrence rate

  • depends on:

  • local time

  • season

  • solar activity


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


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


Dependence of SRS occurrence rate and frequency interval on UT


 F1

 F2

Mixed SRS


Morphological features of the Spectral Resonance Structuresat high latitudesBarentsburg, Spitsbergen


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


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


Dependence of the  F on season


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


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


Model ionospheric profiles and calculated reflection coefficients

for different conditions


Comparison of the observed and calculated SRS frequencies


Future plans


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