Coordinated sporadic E layer observations made with Chung-Li 30Â MHz radar, ionosonde and FORMOSAT-3/COSMIC satellites

►Positive correlation between 30 MHz backscatter and foEs is observed. ►3-m Es FDI Doppler velocity shear is positively correlated to Es layer thickness. ►Height variation in 3-m Es FAI Doppler velocity caused by gravity wave is found.