@article{oai:nipr.repo.nii.ac.jp:00001141,
 author = {Miyazaki, Shigeru and Ogawa, Tadahiko and Mori, Hirotaka},
 journal = {Memoirs of National Institute of Polar Research. Special issue},
 month = {Mar},
 note = {P(論文), The empirical formulae are deduced to infer the nighttime electron density during auroral disturbances from the 30MHz CNA and geomagnetic disturbance levels. The results indicate that log N_e=-1.18×(10)^<-3>&lrtri;H+4.84 at 105km and log N_e=0.362x+4.12 at 90km where N_e is the electron density in (cm)^<-3>, &lrtri;H is the variation of geomagnetic horizontal component in nT and x is the 30MHz CNA level in dB.},
 pages = {304--311},
 title = {Some Features of Nighttime D and E Region Electron Density Profiles in the Polar Ionosphere},
 volume = {18},
 year = {1981}
}