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Vertical group and phase velocities of ionospheric waves derived from the MU radar
Author(s) -
Liu J. Y.,
Hsiao C. C.,
Liu C. H.,
Yamamoto M.,
Fukao S.,
Lue H. Y.,
Kuo F. S.
Publication year - 2007
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/2005rs003435
Subject(s) - ionosphere , gravity wave , radar , geology , phase (matter) , physics , atmosphere (unit) , incoherent scatter , phase velocity , geodesy , group velocity , geophysics , computational physics , optics , wave propagation , meteorology , telecommunications , quantum mechanics , computer science
The middle‐ and upper‐atmosphere (MU) radar (34.85°N, 136.10°E) was operated in the incoherent scatter power‐only mode to observe the ionosphere during 17 June 2001. Pronounced 200‐ to 300‐min. waves in the echo power appeared in the F 2 region during 0240–1250 local time on 17 June 2001. A procedure of Fourier analyses is conducted to derive power spectra, vertical phase, and group velocities of the pronounced waves. Results show that the center frequency of the waves is a function of the wave number. The opposite directions of the vertical phase and group velocities imply the presence of atmospheric gravity waves.