Ionospheric variations in the period range of days to tens of days deduced from HF Doppler observation

Takashi SHIBATA, Yasuo YOSHIMURA, Toshio OGAWA, Takashi OKUZAWA
1989 Journal of geomagnetism and geoelectricity  
doi:10.5636/jgg.41.735 fatcat:eov7g5muebdqnllzktlryxhbni