Wind-Shear-Driven Polarization Electric Fields, and an Electrodynamic Instability of Sporadic E Layers

Details Wind-Shear-Driven Polarization Electric Fields, and an Electrodynamic Instability of Sporadic E Layers Wind-Shear-Driven Polarization Electric Fields, and an Electrodynamic Instability of Sporadic E Layers

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa52a..12c&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA52A-12

Physics

2409 Current Systems (2708), 2411 Electric Fields (2712), 2439 Ionospheric Irregularities, 2443 Midlatitude Ionosphere

Scientific paper

Observations have shown that sporadic-E layers form frontal structures, with strips of enhanced plasma density elongated in the northwest to southeast (northeast to southwest) direction in the northern (southern) hemisphere. There is also evidence that the so-called quasi-periodic (QP) echoes of the midlatitude E region occur as frontal structures with the same alignment. The QP echoes are associated with large electric fields that are thought to have their origin in a sporadic-E layer. In this talk we will describe a mechanism where bye deformed sporadic E layers can support wind-shear-driven polarization electric fields. The fields form by an electrojet like mechanism, and can be quite large. In addition, we show that these polarization electric fields make flat sporadic-E layers unstable. The unstable modes are plane waves, and the growth rate maximizes when the phase fronts are aligned as described above for the observations. Hence, the instability may cause the observed structure.

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