A Revised Automatic Detection Scheme to Identify Equatorial Plasma Bubbles Observed by Advanced Ionospheric Probe Onboard FORMOSAT-5 Satellite

An automatic scheme to detect equatorial plasma bubbles had been developed for Ionospheric Plasma and Electrodynamics Instrument (IPEI) onboard ROCSAT-1 satellite which was in a 35° inclination orbit at 600 km altitude (Su et al., 2006).  However, some mis-identifications could be found in the southern hemisphere of the negative magnetic declination longitudinal region during June solstice when the scheme was applied for data measured by Advanced Ionospheric Probe (AIP) onboard the FORMOSAT-5 satellite which was in a 98.28° inclination sun-synchronous circular orbit at 720 km altitude.  The mis-identifications seems to relate to mid-latitude ring ionospheric troughs (Karpachev, 2019).  In this presentation, global seasonal patterns of the equatorial plasma bubbles from FORMOSAT-5/AIP data during 2018 to 2025 were re-generated by a revised scheme like the rate of change of density index (RODI) by Jin et al. (2019) and are similar to the patterns obtained by ROCSAT1/IPEI data during 1999-2003.