In this study, we estimated the topside scale height of plasma density (Hm) using the Swarm constellation and ionosondes in Korea. The Hm above Korean Peninsula is generally around 50 km. Statistical distributions of the topside scale height exhibited a complex dependence upon local time and season. The results were in general agreement with those of Tulasi Ram et al. (2009), who used the same method to calculate the topside scale height in a mid-latitude region. On the contrary, our results did not fully coincide with those obtained by Liu et al. (2007), who used electron density profiles from Arecibo Incoherent Scatter Radar (ISR) between 1966 and 2002. The disagreement may result from the limitations in our approximation method and data coverage used for estimations, as well as the inherent dependence of Hm on Geographic LONgitude (GLON).

1. INTRODUCTION
 2. INSTRUMENTS
 3. RESULTS AND DISCUSSION
 4. SUMMARY AND CONCLUSION
 ACKNOWLEDGMENTS
 REFERENCES

• Jaeheung Park(Korea Astronomy and Space Science Institute, Daejeon 34055, Korea) Corresponding Author
• Young-Sil Kwak(Korea Astronomy and Space Science Institute, Daejeon 34055, Korea)
• Jun-Chul Mun(Korean Space Weather Center, National Radio Research Agency, Jeju 63025, Korea)
• Kyoung- Wook Min(Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea)