Wavenumber-4 structure of the low-latitude ionospheric TEC

Details Wavenumber-4 structure of the low-latitude ionospheric TEC Wavenumber-4 structure of the low-latitude ionospheric TEC

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsa41a..04w&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SA41A-04

Physics

2415 Equatorial Ionosphere, 2427 Ionosphere/Atmosphere Interactions (0335), 2437 Ionospheric Dynamics

Scientific paper

It has been noticed recently that the low-latitude ionosphere shows a remarkable longitudinal structure of wavenumber-4 patterns, i.e., the equatorial ionospheric anomaly (EIA) crests are enhanced over West Africa, Southeast Asia, Central Pacific Ocean and South America. The present work uses the global ionospheric maps (GIMs) produced at Jet Propulsion Laboratory (JPL) to investigate the longitudinal structure of the low latitude ionosphere. As a proxy of the ionization parameter at low latitudes, the latitudinally integrated total electron content (ITEC) is first extracted from low-latitude GIMs and then Fourier filtered to obtain the wavenumber-4 components. We then study in detail the diurnal, seasonal and solar cycle variations of the wave patterns. It is found that the wavenumber-4 patterns are intense and well developed in northern summer and early northern autumn, but quite weak in northern winter; it increases in northern spring and decreased rapidly in later northern autumn. This seasonal variation is consistent with that of the zonal wind and temperature of the non-migrating tide mode DE3 (eastward propagating zonal wavenumber-3 diurnal tide). We also found that the wavenumber-4 patterns shift eastward with shifting speed smaller in daytime and larger at night. This is attributed to the contribution of both the eastward propagation of DE3 in E-region and the zonal E'B ion drifts in F-region. Our results support the suggestion that the longitudinal wavenumber-4 structure of the low-latitude ionosphere should be originated from the non-migrating tide mode DE3.

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