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首页> 外文期刊>Journal of geophysical research >A statistical study on the F-2 layer vertical variation during nighttime medium-scale traveling ionospheric disturbances
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A statistical study on the F-2 layer vertical variation during nighttime medium-scale traveling ionospheric disturbances

机译：A statistical study on the F-2 layer vertical variation during nighttime medium-scale traveling ionospheric disturbances

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abstract_textpA statistical study on the relationship between the perturbation component (Delta TEC (total electron content)) and the F-2 layer peak height (h(m)F(2)) during nighttime medium-scale traveling ionospheric disturbances is presented. The results are obtained by using a time-dependent computerized ionospheric tomography (CIT) technique. This was realized by using slant total electron content observations from a dense Global Positioning System receiver network over Japan (with more than 1000 receivers), together with a multiplicative algebraic reconstruction technique. Reconstructions from CIT were validated by using ionosonde and occultation measurements. A total of 36 different time snapshots of the ionosphere when medium-scale traveling ionospheric disturbances (MSTIDs) were eminent were analyzed. These were obtained from a data set covering years from 2011 to 2014. The reconstructed surface wavefronts of Delta TEC and h(m)F(2) structure were found to be aligned along the northwest-southeast direction. These results confirm that nighttime MSTIDs are driven by electrodynamic forces related to Perkins instability which explains the northwest-southeast wavefront alignment based on the F region electrodynamics. Furthermore, from the statistical analysis h(m)F(2) varied quasiperiodically in altitude with dominant peak-to-peak amplitudes between 10 and 40 km. In addition, Delta TEC and h(m)F(2) were 60 anticorrelated./p/abstract_text

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