[P-EM09] Vertical coupling in the atmosphere and Ionosphere

[PEM09-P13] Statistical study on daytime Es observed by ground-ionosonde and RO-COSMIC in magnetic Equator region in 2010

*Zheng Wang ^1,2、Huixin Liu¹ (1.Department of Earth and Planetary Sciences, School of Science, Kyushu University, Japan. 、2.National Space Science Center, Chinese Academy of Sciences, China.)

キーワード：daytime ionospheric sporadic E, ground-ionosonde , radio occultation of COSMIC , magnetic Equator region

Scintillations under 150 km height shown by radio occultation (RO) of COSMIC are considered to be associated with ionospheric sporadic E (Es) layer. In this paper, we make a Statistical study on daytime Es observed by ground-ionosonde at five stations in magnetic Equator region in 2010, and make a comparison with S4 index from RO-COSMIC within 6 degree of each station. The results show that: At each station the diurnal variation of foEs from ionosonde decrease a little around LT 0600 and then increase, having maximum around LT 1200, decrease around LT 1800 and then increase near LT 2000-2200; All the S4>=0.3 observations during daytime come from RO-COSMIC under 150 km height; The diurnal variation of S4 index under 150 km height from RO-COSMIC over each station has similar trend with that of foEs at the same station; S4 index over 150 km height from RO-COSMIC is only high during nighttime; For the stations at different longitudes, Es occurrences from ionosonde are positively associated with S4>=0.3 from RO-COSMIC. The comparison shows that the S4 index from RO-COSMIC could show some features of daytime Es layer in magnetic Equator region without the location limitation of ground stations.