Midlatitude type 1 echoes observed with the Chung-Li 52 MHz radar

This paper presents observational characteristics of midlatitude ionospheric E region type 1 echoes measured with a 52 MHz Doppler radar located at the National Central University, Chung-Li, Taiwan. Two events, on August 13 and October 15, 1997, are considered which show clear evidence of type 1 echo occurrence with peak Doppler velocities at about −300 m/s and +270 m/s, respectively. On the other hand, interferometry measurements indicate that the drift motion of the scattering region is eastward in both events, at about 80–100 m/s.