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Observation and modeling of the Earth-ionosphere cavity electromagnetic transverse resonance and variation of the D-region electron density near sunset

Abstract : In the frame of the African Monsoon Multidisciplinary Analyses campaign, measurements of very low frequency electric fields were performed onboard a stratospheric balloon launched on 7 August 2006 from Niamey, Niger. During flight, numerous sferics were observed associated to lightning from active convective cells a few hundred kilometers from the balloon. Lightning data analysis shows the transverse mode mean frequency of the Earth-ionosphere cavity decreasing from ∼2.4 to 2 kHz over a period of 1 h about sunset. The observed change of the transverse resonance near dusk can be fairly reproduced by an electromagnetic wave propagation model, which takes into account the D-region electron density variation predicted by the International Reference Ionosphere model.
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Fernando Simões, Jean-Jacques Berthelier, Michel Godefroy, Sahed Yahi. Observation and modeling of the Earth-ionosphere cavity electromagnetic transverse resonance and variation of the D-region electron density near sunset. Geophysical Research Letters, American Geophysical Union, 2009, 36 (14), pp.L14816. ⟨10.1029/2009GL039286⟩. ⟨hal-00400119⟩

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