Atmospheric gravity waves have been a subject of intense research activity in recent years
because of their myriad effects and their major contributions to atmospheric circulation …

Polar mesosphere summer echoes (PMSE) are very strong radar echoes primarily studied in
the VHF wavelength range from altitudes close to the polar summer mesopause. Radar …

Peculiar atmospheric radar echoes from the high‐latitude summer mesosphere have
spurred much research in recent years. The radar data (taken on frequency bands ranging …

Recently we have begun to appreciate more fully the degree and the consequences of
variability in gravity wave (GW) forcing of the middle atmosphere. Such variability arises for a …

Gravito‐photophoresis, a sunlight‐induced force acting on particles which are geometrically
asymmetric and which have uneven surface distribution of thermal accommodation …

Polar mesospheric clouds (PMC) were observed by an Fe Boltzmann temperature lidar at
the South Pole in the 1999–2000 and 2000–2001 austral summer seasons. We report the …

Simultaneous observations of polar mesosphere summer echoes (PMSE) have been carried
out during summer 1994 in northern Norway using three radars on different frequencies: the …

The Arctic summer mesopause at∼ 88 km is the coldest‐known place (∼ 130 K) in the
terrestrial atmosphere and is∼ 60 K colder in summer than winter. Indirect evidence has …

Mean wind and gravity wave climatologies are presented for the polar mesosphere and
lower thermosphere (MLT). The data were derived using MF radars at Davis (69° S, 78° E) …

A cumulative total of over 5years of data from an MF radar situated at Rothera (67° S, 68° W)
on the Antarctic Peninsula have been used to derive climatologies of periodic motions in the …