This paper describes the initial operations and preliminary results of the Instrument for the study of Stable/Storm-time Space (ISSS) onboard the microsatellite Next Generation Small Satellite-1 (NEXTSat-1), which was launched on December 4, 2018 into a sun-synchronous orbit at an altitude of 575 km with an orbital inclination angle of 97.7°. The spacecraft and the instruments have been working normally, and the results from the observations are in agreement with those from other satellites. Nevertheless, improvement in both the spacecraft/instrument operation and the analysis is suggested to produce more fruitful scientific results from the satellite operations. It is expected that the ISSS observations will become the main mission of the NEXTSat-1 at the end of 2020, when the technological experiments and astronomical observations terminate after two years of operation.

1. INTRODUCTION
2. INITIAL OPERATIONS AND PREPROCESSINGSCHEMES
3. PRELIMINARY RESULTS
    3.1 HEPD Observations
    3.2 MEPD Observations
    3.3 Plasma Observations
4. SUMMARY
REFERENCES

• Eojin Kim(Satellite Technology Research Center, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea)
• Ji-Hyeon Yoo(Department of Astronomy and Space Science, College of Natural Sciences, Chungbuk National University, Chungbuk 28644, Korea)
• Hee-Eun Kim(School of Space Research, Kyung Hee University, Yongin 17104, Korea)
• Hoonkyu Seo(Satellite Technology Research Center, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea)
• Kwangsun Ryu(Satellite Technology Research Center, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea)
• Jongdae Sohn(Korea Astronomy and Space Science Institute, Daejeon 34055, Korea)
• Junchan Lee(Department of Earth and Space Science and Engineering, York University, Toronto M3J 1P3, Canada)
• Jongho Seon(School of Space Research, Kyung Hee University, Yongin 17104, Korea)
• Ensang Lee(School of Space Research, Kyung Hee University, Yongin 17104, Korea)
• Dae-Young Lee(Department of Astronomy and Space Science, College of Natural Sciences, Chungbuk National University, Chungbuk 28644, Korea)
• Kyoungwook Min(Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea)
• Kyung-In Kang(Satellite Technology Research Center, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea)
• Sang-Yun Lee(Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26506-63153, USA)
• Juneseok Kang(School of Space Research, Kyung Hee University, Yongin 17104, Korea)