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Propagation directions of gravity wave patterns observed in OH CCD images during the SEEK Campaign
Author(s) -
Nakamura Takuji,
Tsuda Toshitaka,
Miyagawa Hirohisa,
Matsushita Yoshihito,
Fukunishi Hiroshi,
Takahashi Yukihiro,
Yamada Yoshinori
Publication year - 1998
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/98gl01064
Subject(s) - airglow , gravity wave , gravitational wave , wavelength , altitude (triangle) , geodesy , geology , physics , radar , atmospheric sciences , phase (matter) , geophysics , optics , astrophysics , geometry , telecommunications , computer science , mathematics , quantum mechanics
OH airglow (about 87 km altitude) was observed with a CCD imager at Shigaraki (34.9°N, 136.1°E) in August 1996, during the SEEK campaign period. From nine night observations, the characteristics of the gravity wave modulation of the OH airglow layer were extracted and analyzed. The distributions of the horizontal wavelength, observed wave period and horizontal phase speed were 10–30 km, 5–30 min and 20–60 m/s, respectively. The horizontal propagation direction was mainly north‐eastward. This preferential direction is similar to previous MU radar observations of mesospheric gravity waves (68–80km) in summer months, but different from the propagation direction of gravity waves expected from FAI theories and observations in the E‐region.