In recent times it has become increasingly clear that releases of trace gases from human
activity have a potential for causing change in the upper atmosphere. However, our …

We have investigated a nighttime medium‐scale traveling ionospheric disturbance (MSTID)
observed by an airglow imager at Shigaraki (34.9° N, 25.4° MLAT), Japan, on 17 May 2001 …

The characteristics of nighttime medium‐scale traveling ionospheric disturbance (MSTID)
features observed over Yonaguni (24.5° N, 123.0° E; 19.3° N dip latitude), Japan are studied …

The electrified medium‐scale traveling ionospheric disturbances (EMSTIDs) occurring as
geomagnetically conjugate features in the middle latitude F region ionosphere are studied …

We report simultaneous observations of medium‐scale traveling ionospheric disturbances
(MSTIDs) and field‐aligned irregularities (FAIs) in the F region using two all‐sky airglow …

Pilot observations using a network of five all‐sky imagers (ASIs) were conducted during the
new moon period of May 19–22, 1998 as part of the F‐region Radio and Optical …

Measurements of hydroxyl nightglow emissions over Longyearbyen (78° N, 16° E) recorded
simultaneously by the SABER instrument onboard the TIMED satellite and a ground-based …

To investigate gravity wave dynamics in the mesosphere and lower thermosphere (MLT)
region, we conducted coordinated observations of mesospheric gravity waves over Japan …

Chemiluminescent radiation of the vibrationally and rotationally excited hydroxyl (OH)
radical, which dominates the nighttime near‐infrared emission of the Earth's atmosphere in …

Measurements of dynamic parameters of atmospheric gravity waves, mainly the vertical
wavelength, the momentum flux and the momentum flux divergence, are affected by large …