Physics
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3818102t&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 18, CiteID L18102
Physics
Ionosphere: Auroral Ionosphere (2704), Atmospheric Processes: Mesospheric Dynamics, Atmospheric Processes: Remote Sensing (4337), Atmospheric Processes: Turbulence (4490), Atmospheric Processes: Acoustic-Gravity Waves
Scientific paper
We report a sporadic sodium layer (SSL), in particular its fine structure, observed at 92-98 km between 20:00 and 23:30 UT (21:00-24:30 LT) on 11 January 2011 using a sodium lidar, which was installed in the European incoherent scatter (EISCAT) radar site at Tromsø, Norway (69.6°N, 19.2°E) in early 2010. The sodium lidar measurement with 5-sec time-resolution reveals the details of dramatic sodium-density increase as well as short-period wavelike structure in the SSL. The rate of increase of height-integrated sodium density at the beginning of the SSL event was 6.4-9.6 × 1010 m-2 s-1. Dominant oscillation periods in the wavelike structures were 7-11 min at 95-98 km and 3 min at 92-95 km. The calculated power spectral densities are well represented by power laws, implying the presence of the short-period waves and turbulence in the frequency range of 10-4-10-1 Hz.
Brekke Asgeir
Fujii Ryoichi
Fujiwara Hideaki
Hall Chris Michael
Kawabata Takuya
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