Abstract
Low altitude quasi-periodic radar echoes observed by the Gadanki VHF radar
Institute of Space Science, National Central University, Chung-Li, Taiwan
National MST Radar Facility, Tirupati, India
We report here on the low altitude quasi-periodic (LQP) radar echoes from low latitude sporadic E layer (Es) observed by the
Gadanki (13.5°N, 79.2°E; geomagnetic latitude 6.3°N) VHF radar. The LQP echoes occurred both during daytime and nighttime
and are confined to a slowly descending layer with a thickness of about 2–4 km in the height range of 90–100 km. The periods
are found to range from tens of seconds to less than about 3 minutes. The Doppler velocities vary over a range of −20 to +20
m/s during daytime and 0 to 10 m/s during nighttime and are known to be sensitive to the layer height, being dominated by
the effect of zonal electric field above and meridional neutral wind below a height of ∼97 km for the type 2 irregularities
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Published 12 June 2002.
Citation: (2002), Low altitude quasi-periodic radar echoes observed by the Gadanki VHF radar, Geophys. Res. Lett., 29(11), 1530, doi:10.1029/2001GL014331.
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