@article{oai:nipr.repo.nii.ac.jp:00006303,
 author = {Ondoh, Tadanori},
 journal = {Advances in polar upper atmosphere research},
 month = {Aug},
 note = {P(論文), Polar cusp VLF hiss of irregular spectra is observed mainly at geomagnetic invariant latitudes from 74° to 84°, and at geomagnetic local times from 10 to 14 hours. This occurrence region corresponds well to a region of cusp precipitations of lowenergy electrons below 1 keV. Changes of lower cutoff frequency of polar cusp hiss are related with plasma irregularities in the polar cusp ionosphere. The whistler-mode Cerenkov radiation from electrons below I keV is discussed for generating the polar cusp hiss, but this mechanism can not work in the polar cusp ionosphere for VLF frequencies much lower than a local electron gyrofrequency. The whistler-mode VLF Cerenkov radiation is generated from the electrons below 1 keV at high altitude(～6 R_E) cusp magnetosphere, where a local electron gyrofrequency is in VLF band. The whistler-mode cusp hiss generated at high altitudes will propagate along field-aligned cusp plasma down to a strong geomagnetic field region where the cusp structure fades out. Below this region, the whistler-mode hiss spreads over the polar cusp ionosphere where low energy electron precipitations produce ionospheric irregularities.},
 pages = {55--65},
 title = {Generation region of polar cusp hiss observed by ISIS satellites},
 volume = {14},
 year = {2000}
}