Global Occurrence Rates of Ionospheric Plasma Density Irregularities Observed by Advanced Ionospheric Probe Onboard FORMOSAT-5 Satellite During Solar Minimum
<p>&#12288;&#12288;A remote sensing satellite, FORMOSAT-5, developed by National Space Organization (NSPO) carried a piggyback science payload, Advanced Ionospheric Payload (AIP), for space weather and seismo-ionospheric precursor study. &#160;To meet the science requirements, AIP could be operated in different measurement modes to obtain various plasma parameters. &#160;The first AIP measurement was performed on 7 September 2017 to obtain the first-orbit data and started routine operation in November the same year. &#160;Global ion density and ion velocity/temperature distributions were available every two days and four days, respectively. &#160;AIP was regularly operated in a sampling rate 1,024 Hz to maximize useful science data. &#160;In this poster, global occurrence rates of pre-midnight low-latitude ionospheric plasma density irregularities will be shown from AIP science data collected since winter 2017. &#160;The results indicate that seasonal variations of the occurrence rates during the solar minimum (2017/11-2019/12) are distributed very similar to but have lower magnitudes than those observations by ROCSAT-1/Ionospheric Plasma and Electrodynamics Instrument dataset (1999-2004) during solar maximum.</p>