Modeling of Neutral Turbulence Driven by Large Amplitude Wind Shears to Form Sporadic- E Layer Structures

Details Modeling of Neutral Turbulence Driven by Large Amplitude Wind Shears to Form Sporadic- E Layer Structures Modeling of Neutral Turbulence Driven by Large Amplitude Wind Shears to Form Sporadic- E Layer Structures

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa41a..06b&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA41A-06

Physics

2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities

Scientific paper

The evidence for wind-shear driven modulation of the E-Layer is strong. Large amplitude wind shears are seen with both TMA and LIDAR Observations. The neutral turbulence as observed by TMA Trails provides turbulence levels consistent with Richardson numbers that yield excitation of Kelvin-Helholtz (KH) instability in the neutral atmosphere. Ri ~ 0.2 KH billows are obtained during the from SEEK2 experiment by Larsen et al., AG, 2006. Electron density images show billows and longitudinal tube structures. Billows are seen in ISR scans by Miller and Smith [JGR 1978] and Hysell and Larsen [AG 2004]. Radio induced aurora images over Puerto Rico [Bernhardt et al., JGR, 2003] show both zonal KH scale structures and longitudinal ripples in E- layer density. Finally, the SEEK2 tomographic images by Bernhardt et al.,[AG, 2006] show layer separation consistent with KH billows. Electrodynamic models show that the KH Instability is a significant source of E- Layer structure. The wind-driven shear instability is a primary source of sporadic-E structures and may also be a seed for plasma instabilities such as proposed by Cosgove and Tsunoda.

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