@article{oai:nipr.repo.nii.ac.jp:00006312,
 author = {Hedin, Mikael and Haggstrom, Ingemar and Pellinen-Wannberg, Asta and Andersson, Laila and Brandstrom, Urvan and Gustavsson, Björn and Steen, Ake and Westman, Assar and Wannberg, Gudmund and Eyken, Tony van and Aso, Takehiko and Cattell, Cynthia and Carlson, Charles W. and Klumpar, Dave},
 journal = {Advances in polar upper atmosphere research},
 month = {Aug},
 note = {P(論文), The EISCAT radar system has been used for the first time in a four-beam meridional mode. The FAST satellite and ALIS imaging system is used in conjunction to support the radar data, which was used to identify a main ionospheric trough. With this large latitude coverage the trough was passed in 21/2hours period. Its 3-dimensional structure is investigated and discussed. It is found that the shape is curved along the auroral oval, and that the trough is wider closer to the midnight sector. The position of the trough coincide rather well with various statistical models and this trough is found to be a typical one.},
 pages = {157--162},
 title = {3-D extent of the main ionospheric trough - a case study},
 volume = {14},
 year = {2000}
}