@article{oai:nipr.repo.nii.ac.jp:00001259,
 author = {Machida, Shinobu and Tsuruda, Koichiro},
 journal = {Memoirs of National Institute of Polar Research. Special issue},
 month = {Sep},
 note = {P(論文), The spatial intensity distribution of whistlers in the vicinity of the ionospheric wave exit region is investigated by analyzing the whistler data obtained at multiple stations. The typical attenuation gradient with the distance was derived to be 6dB/100km which was appreciably higher than what had been expected. A clear relationship between the attenuation gradient and the wave frequency was not found. The wave intensity peak on the ground took place at a higher latitude than that of the propagation path derived from the nose frequency of whistlers.},
 pages = {70--81},
 title = {Spatial intensity distribution of whistlers},
 volume = {22},
 year = {1982}
}