Faculty Profiles - OYAMA, Shin-ichiro

Papers - OYAMA, Shin-ichiro

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A comparison study of the auroral lower thermopsheric neutral winds derived by the EISCAT UHF radar and the Tromso MF radar Reviewed Open Access

Nozawa, S., A. Brekke, A. Manson, C. M. Hall, C. Meek, K. Morise, S. Oyama, K. Dobashi, and R. Fujii

J. Geophysical Research page： 107, 10.1029/2000JA007581 2002.8

Field-aligned ion motions in the E and F region Reviewed

Fujii, R., S. Oyama, S. C. Buchert, S. Nozawa, and N. Matuura

J. Geophysical Research page： 107, 10.1029/ 2001JA900148 2002.5

Effects of auroral arc on the generation of atmospheric gravity waves in the polar F-region Reviewed

Oyama, S., H. Shinagawa, S. C. Buchert, R. Fujii, S. Nozawa, M. Ishii, Y, Murayama, and W. Kofman

Advances in Space Res. Vol. 27 page： 1767-1772 2001.10

*Generation of atmospheric gravity waves associated with auroral activity in the polar F region Reviewed Open Access

Oyama, S., M. Ishii, Y. Murayama, H. Shinagawa, S. C. Buchert, S. Nozawa, R. Fujii, and W. Kofman

J. Geophysical Research Vol. 106 page： 18,543-18,554 2001.2

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

Relationships between the generation of atmospheric gravity waves and
auroral activity were investigated using data on neutral
oscillations, at periods of 20-30 min,
estimated from European Incoherent Scatter radar data in the polar
F-region (150-300 km).
The equation for the neutral dispersion relation gave
the values of the wave parameters,
such as the
phase velocity and wavelength, applicable to the estimated oscillations.
These values were used to estimate the distance between the observation
position and the region where the oscillations were generated.
The estimated distance superimposed on all-sky images
taken at Kilpisjarvi suggests
that the auroral arc extended in an almost zonal direction related to
the generation of the oscillations.
The oscillations were compared with ones calculated
using the Francis model.
The phase surface of the modeled atmospheric gravity waves showed fairly
good agreement with that of the observed oscillations,
suggesting that the estimated distance is acceptable
for reproducing the estimated oscillations with the model.
It is concluded that auroral activities significantly relate to the AGW
generation in the polar thermosphere as investigated with theoretical
studies.

DOI： 10.1029/2001JA900032

Effects of atmospheric oscillations on the field-aligned ion motions in the polar F-region Reviewed Open Access

Oyama, S., S. Nozawa, S. C. Buchert, M. Ishii, S. Watari, E. Sagawa, W. Kofman, J. Lilensten, and R. Fujii

Ann. Geophysicae Vol. 18 page： 1154-1163 2000.9

Dynamics of neutral wind in the polar region observed with two Fabry-Perot interferometers Reviewed Open Access

Ishii, M., S. Oyama, S. Nozawa, R. Fujii, E. Sagawa, S. Watari, and H. Shinagawa

Earth Planets and Space Vol. 51 page： 833-844 1999.8

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Papers - OYAMA, Shin-ichiro