Acknowledgement
This work was supported by Korea Polar Research Institute (KOPRI) grant funded by the Ministry of Oceans and Fisheries (KOPRI PE23020). Y.-S. Kwak was supported by the basic research funding from Korea Astronomy and Space Science Institute (KASI). The EISCAT is an international association supported by research organizations in China (CRIRP), Finland (SA), Japan (NIPR and ISEE), Norway (NFR), Sweden (VR), and the United Kingdom (UKRI).
References
- Cai HT, Ma SY, Fan Y, Liu YC, Schlegel K, Climatological features of electron density in the polar ionosphere from long-term observations of EISCAT/ESR radar, Ann. Geophys. 25, 2561-2569 (2007). https://doi.org/10.5194/angeo-25-2561-2007
- Endo M, Fujii R, Ogawa Y, Buchert SC, Nozawa S, et al., Ion upflow and downflow at the topside ionosphere observed by the EISCAT VHF radar, Ann. Geophys. 18, 170-181 (2000). https://doi.org/10.1007/s00585-000-0170-3
- Fontaine D, Structure and dynamics of the Earth's polar ionosphere: recent results inferred from incoherent scatter sounders, Plasma Sources Sci. Technol. 11, A113 (2002). https://doi.org/10.1088/0963-0252/11/3A/317
- Ham YB, Jee G, Lee C, Kwon HJ, Kim JH, et al., Observations of the polar ionosphere by the vertical incidence pulsed ionospheric radar at Jang Bogo Station, Antarctica, J. Astron. Space Sci. 37, 143-156 (2020). https://doi.org/10.5140/JASS.2020.37.2.143
- Heelis RA, The polar ionosphere, Rev. Geophys. 20, 567-576 (1982). https://doi.org/10.1029/rg020i003p00567
- Jee G, Kim JH, Lee C, Kim YH, Ground-based observations for the upper atmosphere at King Sejong Station, Antarctica, J. Astron. Space Sci. 31, 169-176 (2014). https://doi.org/10.5140/jass.2014.31.2.169
- Ji EY, Jee G, Lee C, Characteristics of the occurrence of ion upflow in association with ion/electron heating in the polar ionosphere, J. Geophys. Res. Space Phys. 124, 6226-6236 (2019). https://doi.org/10.1029/2019JA026799
- Kim E, Jee G, Ji EY, Kim YH, Lee C, et al., Climatology of polar ionospheric density profile in comparison with mid-latitude ionosphere from long-term observations of incoherent scatter radars: a review, J. Atmos. Sol. Terr. Phys. 211, 105449 (2020). https://doi.org/10.1016/j.jastp.2020.105449
- Kwon HJ, Lee C, Jee G, Ham Y, Kim JH, et al., Ground-based observations of the polar region space environment at the Jang Bogo station, Antarctica, J. Astron. Space Sci. 35, 185-193 (2018). https://doi.org/10.5140/jass.2018.35.3.185
- Lehtinen M, Markkanen J, Vaananen A, Huuskonen A, Damtie B, et al., A new incoherent scatter technique in the EISCAT Svalbard Radar, Radio Sci. 37, 3-1-3-14 (2002). https://doi.org/10.1029/2001rs002518
- Liu C, Horwitz JL, Richards PG, Effects of frictional ion heating and soft-electron precipitation on high-latitude F-region upflows, Geophys. Res. Lett. 22, 2713-2716 (1995). https://doi.org/10.1029/95GL02551
- McCrea I, Aikio A, Alfonsi L, Belova E, Buchert S, et al., The science case for the EISCAT_3D radar, Prog. Earth Planet. Sci. 2, 21 (2015). https://doi.org/10.1186/s40645-015-0051-8
- Moen J, Qiu XC, Carlson HC, Fujii R, McCrea IW, On the diurnal variability in F2-region plasma density above the EISCAT Svalbard radar, Ann. Geophys. 26, 2427-2433 (2008). https://doi.org/10.5194/angeo-26-2427-2008
- Ogawa Y, Buchert SC, Fujii R, Nozawa S, van Eyken AP, Characteristics of ion upflow and downflow observed with the European Incoherent Scatter Svalbard radar, J. Geophys. Res. Space Phys. 114, A05305 (2009). https://doi.org/10.1029/2008JA013817
- Ogawa Y, Buchert SC, Sakurai A, Nozawa S, Fujii R, Solar activity dependence of ion upflow in the polar ionosphere observed with the European Incoherent Scatter (EISCAT) Tromso UHF radar, J. Geophys. Res. Space Phys. 115, A07310 (2010). https://doi.org/10.1029/2009JA014766
- Ogawa Y, Fujii R, Buchert SC, Nozawa S, Ohtani S, Simultaneous EISCAT Svalbard radar and DMSP observations of ion upflow in the dayside polar ionosphere, J. Geophys. Res. Space Phys. 108, A3 (2003). https://doi.org/10.1029/2002JA009590
- Rishbeth H, van Eyken AP, EISCAT: early history and the first ten years of operation, J. Atmos. Terr. Phys. 55, 525-542 (1993). https://doi.org/10.1016/0021-9169(93)90002-G
- Sanchez ER, StrOmme A, Incoherent scatter radar-FAST satellite common volume observations of upflow-to-outflow conversion, J. Geophys. Res. Space Phys. 119, 2649-2674 (2014). https://doi.org/10.1002/2013JA019096
- Strangeway RJ, Ergun RE, Su YJ, Carlson CW, Elphic RC, Factors controlling ionospheric outflows as observed at intermediate altitudes, J. Geophys. Res. Space Phys. 110, A03221 (2005). https://doi.org/10.1029/2004JA010829
- Wahlund JE, Opgenoorth HJ, Haggstrom I, Winser KJ, Jones GOL, EISCAT observations of topside ionospheric ion outflows during auroral activity: revisited, J. Geophys. Res. Space Phys. 97, 3019-3037 (1992). https://doi.org/10.1029/91JA02438
- Wannberg G, History of EISCAT - part 5: operation and development of the system during the first 2 decades, Hist. Geo Space Sci. 13, 1-21 (2022). https://doi.org/10.5194/hgss13-1-2022
- Wannberg G, Wolf I, Vanhainen LG, Koskenniemi K, Rottger J, et al., The EISCAT Svalbard radar: A case study in modern incoherent scatter radar system design, Radio Sci. 32, 2283-2307 (1997). https://doi.org/10.1029/97rs01803
- Wu Q, Knipp D, Liu J, Wang W, Haggstrom I, et al., What do the new 2018 HIWIND thermospheric wind observations tell us about high-latitude ion-neutral coupling during daytime? J. Geophys. Res. Atmos. 124, 6173-6181 (2019a). https://doi.org/10.1029/2019JA026776
- Wu Q, Knipp D, Liu J, Wang W, Varney R, et al., HIWIND observation of summer season polar cap thermospheric winds, J. Geophys. Res. Space Phys. 124, 9270-9277 (2019b). https://doi.org/10.1029/2019JA027258
- Wu Q, Wang W, Roble RG, Haggstrom I, Stromme A, First daytime thermospheric wind observation from a ballon-borne FabryPerot interferometer over Kiruna (68N), Geophys. Res. Lett. 39, L14104 (2012). https://doi.org/10.1029/2012GL052533
- Xu S, Zhang BC, Liu RY, Guo LX, Wu YW, Comparative studies on ionospheric climatological features of NmF2 among the Arctic and Antarctic stations, J. Atmos. Sol. Terr. Phys. 119, 63-70 (2014). https://doi.org/10.1016/j.jastp.2014.06.016