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Long base‐line measurements of short‐period mesospheric gravity waves during the SEEK Campaign
Author(s) -
Taylor M. J.,
Seo S. H.,
Nakamura T.,
Tsuda T.,
Fukunishi H.,
Takahashi Y.
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 - 10.1029/98gl00847
Subject(s) - airglow , gravity wave , gravitational wave , period (music) , line (geometry) , geology , mesosphere , atmospheric sciences , geodesy , geophysics , meteorology , environmental science , physics , astrophysics , stratosphere , geometry , mathematics , acoustics
Simultaneous observations of short‐period (<1 hour) mesospheric gravity waves were made over an extended base‐line (∼660 km) from two sites in Japan (at Shigaraki and Yamagawa) during the SEEK (Sporadic‐E Experiment over Kyushu) campaign, 9–23 August, 1996. Coincident image data obtained on four nights provided a rare opportunity to investigate the horizontal spatial extent and propagation characteristics of the waves in detail. Surprisingly, out of a total of 12 events observed from Shigaraki and 10 from Yamagawa at most only three exhibited similar propagation characteristics at each site. The majority of the wave displays (∼70–75%) had quite dissimilar characteristics suggesting a preponderance for localized wave motions of limited lifetimes and geographical extent. A marked preference for wave progression towards the N‐NE indicates that the gravity waves imaged in the near infrared OH and OI (557.7 nm) nightglow emissions were probably not directly associated with the observed E‐region irregularities.