2020JA028225-ionosondedoi:10.18170/DVN/I9JJIYPeking University Open Research Data Platform2021-09-011Donghe Zhang, 2021, "2020JA028225-ionosonde", http://doi.org/10.18170/DVN/I9JJIY, Peking University Open Research Data Platform, V12020JA028225-ionosondedoi:10.18170/DVN/I9JJIYDonghe ZhangPeking University Open Research Data Platform2021-09-01Earth and Environmental SciencesHere two files include the ionospheric foF2 and hmF2 data observed at China Haikou ionosonde station (20.02°N, 110.2°E, MLAT~ 9.32°N) in 2003 (16 April to 31 May) and in 2004 (21 Sep to 26 Oct ), respectively. The first column is the Day of year (DOY), the second column is the foF2(Mhz), the third column is the hmF2(km).Yongqiang Hao2021-09-01CC0 WaiverfoF2_hmf2 (16 April to 31 May 2003).txttext/plainfoF2_hmf2 (21 Sep to 26 Oct 2004).txttext/plainREADME.txttext/plain