## 1 Introduction  
The 1957/1958 International Geophysical Year saw the launch of the first artificial satellites to study the near-Earth space environment (ionosphere and magnetosphere), as well as the global growth in research and educational institutions focused on the Earth and Space sciences. One of these institutions was National Central University (NCU), which was established in Taiwan in 1962, and has had a strong focus on space physics, satellite remote sensing, and payload development [1]. One important scientific need in the field of space weather is the need for an increased number of in- situ observations of the ionosphere (60-1000 km altitude) [2]. Ionospheric plasma either significantly refracts, attenuates, or both, radio frequency (RF) signals ranging from the medium frequency (MF, 300 kHz-3 MHz) and high frequency (HF, 3-30 MHz) bands that are used for terrestrial over the horizon communication, as well as the L-band (1-2 GHz), S-band (2-4 GHz), C-band (4-8 GHz), and X-band (8-12 GHz) frequencies that are used for satellite navigation and communications [3; 4; 5; 6]. In response to this need, the NCU Department of Space Science and Engineering has developed the Advanced Ionospheric Probe (AIP) in situ plasma sensor that has been operational on the large FORMOSAT-5 spacecraft since September 2017 [7]. To increase opportunities for flight, as well as the number of observations available, AIP has been further miniatured into the Compact Ionospheric Probe (CIP), with a mass of 0.47 kg and a size of 0.72 U (10 cm \(\times\) 10 cm \(\times\) 7.2 cm). To develop spacecraft engineering capacity at NCU, the Ionospheric Dynamics and Attitude Subsystem Satellite (IDEASSat) was proposed in response to the Taiwan Space Industry Pioneering Project defined by the National Space Organization (NSPO) in 2017. The mission was envisioned to serve as a platform for in-situ ionospheric measurements using CIP, as well as an opportunity for project-based learning in spacecraft design and the first iteration of an NCU developed satellite avionics system. The project was approved and initiated in 2017, with the preliminary and critical design phases taking place between 2017 and 2019, and flight model fabrication, integration, and testing taking place from 2019 to 2020. The delivery deadline mandated by the selected SpaceX Falcon 9 launch was 27 November 2020. The development team was comprised almost entirely of graduate and upper division undergraduate students under the supervision of the PI, totaling approximately 20 students throughout the entire development and operation period. IDEASSat was the first spacecraft to be developed in-house at NCU, but also the second spacecraft of the International Satellite Program in Research and Education (INSPIRE) consortium, of which NCU is a member. As such, IDEASSat is also referred to as INSPIRESat-2 (IS-2) [8]. IDEASSat was successfully launched into orbit on 24 January 2021. After 21 days, the satellite stopped transmitting beacon signals and failed to respond to uplinked commands. After 1.5 months, the satellite resumed communication briefly for three days, which was sufficient time for commands to be uplinked ordering the spacecraft to replay saved flight data, allowing for the cause of the blackout to be pinpointed. In the second section, this paper will introduce the implementation of the spacecraft sub-systems used in the final flight model (FM). Since the IDEASSat mission concept and critical design was presented by [PERSON] et al., this article will describe the flight model design that was actually implemented, as well as the flight software, and related environmental testing in detail. Due to the limitations in funding and time, a single protoflight model of the full spacecraft was built, as opposed to a separate engineering qualification model of the entire spacecraft system.