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

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 at different latitudes

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


Examples of srs observed at crete greece l 1 3 during three successive days
Examples of SRS observed at at different latitudesCrete (Greece, L~1.3) during three successive days


Examples of srs observed in barentsburg spitsbergen l 15 2 during two successive days
Examples of SRS observed in at different latitudesBarentsburg (Spitsbergen, L~15.2)during two successive days


Generation of the ionospheric alfven resonator iar
Generation of the Ionospheric Alfven Resonator (IAR) at different latitudes

After Belyaev et al. (1985)


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

 F at different latitudes1

 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
Dependence of the frequency interval of IAR ( at different latitudes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 structures at mid latitudes nizhny novgorod
Morphological features of the Spectral Resonance Structures at different latitudesat 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 mid-latitude in the nighttime and daytime in the years of solar activity minimum

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 Structures mid-latitude in the nighttime and daytime in the years of solar activity minimumat high latitudes Sodankyla Geophysical Observatory


Examples of Spectral Resonance Structure observed in mid-latitude in the nighttime and daytime in the years of solar activity minimum

Sodankyla Geophysical Observatory during two successive days


  • The SRS frequency mid-latitude in the nighttime and daytime in the years of solar activity minimum

  • interval (F) depends on:

  • local time

  • season

  • solar activity


  • The SRS occurrence rate mid-latitude in the nighttime and daytime in the years of solar activity minimum

  • depends on:

  • local time

  • season

  • solar activity


Morphological features of the spectral resonance structures at low latitudes island of crete greece
Morphological features of the Spectral Resonance Structures mid-latitude in the nighttime and daytime in the years of solar activity minimumat low latitudes Island of Crete, Greece


Examples of srs observed at crete greece l 1 3 during three successive days1
Examples of SRS observed at mid-latitude in the nighttime and daytime in the years of solar activity minimumCrete (Greece, L~1.3) during three successive days



Mixed srs

UT F1

 F2

Mixed SRS


Morphological features of the Spectral Resonance Structures UTat high latitudesBarentsburg, Spitsbergen


Examples of srs observed in barentsburg spitsbergen l 15 2 during two successive days1
Examples of SRS observed in UTBarentsburg (Spitsbergen, L~15.2)during two successive days


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


Dependence of the f on season
Dependence of the observation as a function of season  F on season




Model ionospheric profiles and calculated reflection coefficients

for different conditions



Future plans coefficients


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