THOUGHTS ON SOLAR CYCLE VARIABILITY OF GLOBAL SPRITE OCCRRENCES
Twelve year long observations of natural magnetic field variations in the frequency range 5-50 Hz at Arrival Heights, Antarctica, are summarized in mean diurnal spectra. The observed central frequencies of the Schumann resonances are used to derive corresponding phase velocities, which are explained...
| Main Authors: | , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.1137 http://www.ursi.org/Proceedings/ProcGA02/papers/p0490.pdf |
| Summary: | Twelve year long observations of natural magnetic field variations in the frequency range 5-50 Hz at Arrival Heights, Antarctica, are summarized in mean diurnal spectra. The observed central frequencies of the Schumann resonances are used to derive corresponding phase velocities, which are explained with a time independent global two scale height ionospheric conductivity profile. The time dependent ionospheric reflection height exhibits a 2.5 km variability during the solar cycle and the solar rotation period in agreement with ionization changes from solar short wave radiation, which are unlikely to significantly enhance mesospheric breakdown for sprites to occur. |
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