Fig. 2From: Spread F occurrence and drift under the crest of the equatorial ionization anomaly from continuous Doppler sounding and FORMOSAT-3/COSMIC scintillation dataDoppler shift spectrogram computed from data recorded in Taiwan by the receiver Rx1 on March 16, 2014, from 12:00 UT to 18:00 UT (solar local time LT = UT + 8.1). Magenta asterisks show the determined times of OSS beginning; magenta line represents the evaluated tilt Δf D /ΔT Back to article page