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Introduction:      

Chinese satellite I (Formosa-1) is the first low earth orbit science experiment satellite leading by national space center, after lunch on Jan. 27th, 1999, entering the low orbit flight, 600km above the earth surface, 35° inclination with the equator, bypassing earth on round in about 97 minutes, transferring collected data to corresponding receive station six times daily. Main scientific mission includes measuring ionospheric plasma electrodynamics, ocean water color photo taking, Ka frequency band communication experiment.  Using the payload remote measuring data collected by satellite, dissipating to domestic scientific group and international research institute engaging with scientific experiment.
In the research of ionospheric character, it is helpful to understand structures of atmosphere above and surrounding Taiwan, to provide important information affecting radio communication, in research of ocean water color, providing experiment data of ocean related field, to be the practical and theory basis of environment, fishery, business and academic.  In the aspect of Ka band communication experiment, conducting Taiwan area Ka band low speed, high speed and rain attenuation communication experiment, and further conducting safe communication experiment, to enhance domestic communication system ability.
Chinese satellite I (Formosa-1) mission life length is 2 years, designed life length is 4 years, practical operation time is nearly 5 and half years. On the Jun. 17th 2004, the mission accomplished formally. The three scientific mission is accomplished in sequence, the achievements exceeds anticipated targets.

Chinese satellite I (Formosa-1) ionospheric plasma and electrodynamics instruments, abbreviated as IPEI, including four detectors: Ion Trap, a pair of Ion Drift Meter, and Retarding Potential Analyzer.