# INSPIRE-SAT 7, a Second CubeSat to Measure the Earth's Energy Budget and to Probe the Ionosphere
## 3 Description of the INSPIRE-SAT 7 Mission and Mission Operations  
INSPIRE-SAT 7 is a scientific and technical LATMOS/ONERA mission based on the implementation of a second CubeSat to study the Sun and the Earth. We hope that INSPIRE-SAT 7 will double transmission capacity of UVSQ-SAT [1], and the constellation will be able to relay the data from two observation satellites simultaneously. Above all, INSPIRE-SAT 7 will ensure UVSQ-SAT ERB data continuity.  
The INSPIRE-SAT 7 mission is based on a space segment, which comprises a 2-Unit CubeSat (Figure 1) and the uplink and downlink satellite links. The INSPIRE-SAT 7 mission also has a ground segment with at least one LATMOS UHF/VHF station located at Observatoire de Versailles Saint-Quentin-en-Yvelines (OVSQ, France) that will provide radio interfaces with the CubeSat. The ground segment is also based on a mission operations center, from which INSPIRE-SAT 7 will be managed and a ground networks that will connect the other ground elements to one another. Finally, the LATMOS science operation centre will be responsible for the calibration of the instruments onboard the CubeSat, and for helping the scientific community to process and analyse the data obtained by the instruments being flown.  
The INSPIRE-SAT 7 mission commits to respect the French space operation act. This act translates the international commitments that France has made under United Nations treaties and the requirements than space operators (LATMOS) must fulfill with regard to the safety of people, property and the environment, and to public health. One of the obligations is to deplete all CubeSat onboard sources of stored energy and disconnect all energy generation sources when they are no longer required for mission operations or post-mission disposal or control to a level which can not cause an explosion or deflagration large enough to release orbital debris or break up the CubeSat. One of the commitments is to passivate the batteries or to demonstrate that most debris from the battery rupture should be contained within the CubeSat. Several failure modes (internal short circuit, internal thermal rise due to high load discharge rate, overcharging and excessive charge rate, excessive discharge rate, excess temperatures due to orbital environment and high discharge combined, polarity reversal due to over-discharge caused by continuous load during periods of negative power generation vs. consumption) might result in INSPIRE-SAT 7 batteries explosion. In this case, most debris from the INSPIRE-SAT 7 batteries (Panasonic NCR18650B) rupture will be contained within the CubeSat due to the lack of penetration energy. However, this scenario is not considered. Indeed, if the INSPIRE-SAT 7 batteries fail, they are expected to vent gas rather than explode. A test with the INSPIRE-SAT 7 batteries (qualification model) in its enclosure will be done (16 V, 0.2 A, 80 \({}^{\circ}\)C) to validate the ventilation mechanisms in case of overpressure.  
Figure 1: Computer-aided design of the INSPIRE-SAT 7 CubeSat with all printed circuit boards (PCBs) and payload instruments (ERS, TSIS sensors, UV sensors (standard and new generation), Li-Fi payload, CUIONO1 payload, SPINO payload, IMU).