Faculty Profiles - OTSUKA, Yuichi

Papers - OTSUKA, Yuichi

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A climatology of F region gravity wave propagation over the middle and upper atmosphere radar Reviewed

WL Oliver, Y Otsuka, M Sato, T Takami, S Fukao

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS Vol. 102 ( A7 ) page： 14499 - 14512 1997.7

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER GEOPHYSICAL UNION

By observing the ionospheric F region simultaneously in multiple beams with the middle and upper atmosphere radar, we have been able to track the passage of gravity waves and measure their propagation characteristics. Here we develop a climatology of wave propagation based on the observation of 58 daytime experiments conducted during 1986-1994. The thermosphere seems to be continuously swept by waves detectable by an incoherent scatter radar. These waves generally come for hours on end from a,consistent or slowly varying direction, which can be any direction on a given day. Statistically, the waves show a moderate preference for southward travel, with this preference being reduced or shifted to southeastward travel during disturbed times. On average, the horizontal phase trace speed remains near 240 m/s for all periods inspected (40-130 min). This speed matches the behavior expected for lossless waves with 150-200 km vertical wavelength. We find small variability in this relation for different times of day, seasons, solar and magnetic conditions, and directions of wave travel, though waves on disturbed days seem to travel moderately faster on solar minimum mornings.

DOI： 10.1029/97JA00491

Web of Science

A climatology of F region gravity wave propagation over the middle and upper atmosphere radar Reviewed

Journal of Geophysical Research Vol. 102 page： 14,499-14,512 1997

New aspects in the annual variation of the ionosphere observed by the MU radar Reviewed

Geophysical Research Letters Vol. 24 page： 2,287-2,290 1997

Middle and upper atmosphere radar observations of the dispersion relation for ionospheric gravity waves Reviewed

Journal of Geophysical Research Vol. 100 page： 23,763-23,768 1995

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Papers - OTSUKA, Yuichi