Observations of peculiar sporadic sodium structures and their relation with wind variations

Details Observations of peculiar sporadic sodium structures and their relation with wind variations Observations of peculiar sporadic sodium structures and their relation with wind variations

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jastp..71..575s&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 71, Issue 5, p. 575-582.

Physics

1

Resonance Lidar, Sporadic Sodium Layers, Meteor Radar, Wind Shear

Scientific paper

Resonance lidar observations of sodium density in the upper mesosphere region over Gadanki (13.5°N, 79.2°E) rarely show complex structures with rapid enhancements of sodium density, completely different from normal sporadic sodium structures. The hourly averaged meteor radar zonal winds over Trivandrum (8.5°N, 76.5°E) show an eastward shear with altitude during the nights, when these events are formed. As suggested by Kane et al. [2001. Joint observations of sodium enhancements and field-aligned ionospheric irregularities. Geophysical Research Letters 28, 1375-1378], our observations show that the complex structures may be formed due to Kelvin-Helmholtz instability, which can occur in the region of strong wind shear.

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