Shear flow effects at the onset of equatorial spread F

Details Shear flow effects at the onset of equatorial spread F Shear flow effects at the onset of equatorial spread F

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa42a..06h&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA42A-06

Computer Science

Sound

2415 Equatorial Ionosphere, 2435 Ionospheric Disturbances, 2439 Ionospheric Irregularities, 2471 Plasma Waves And Instabilities (2772)

Scientific paper

Experiments were conducted during the NASA EQUIS II sounding rocket campaign on Kwajalein Atoll to elucidate the electrodynamics and layer structure of the postsunset equatorial F region ionosphere prior to the onset of equatorial spread F (ESF). Experiments took place on August 7 and 15, 2004, each comprised of the launch of an instrumented and two chemical release sounding rockets. The instrumented rockets measured plasma number density, vector electric fields, and other parameters to an apogee of about 450 km. The chemical release rockets yielded lower thermospheric wind profile measurements. The Altair radar was used to monitor coherent and incoherent scatter in UHF and VHF bands. Strong plasma shear flow was evident in both experiments. Bottom-type scattering layers were observed below the shear nodes in westward-drifting plasma strata. The layers were often patchy and distributed periodically in space. We attribute the patchiness to large-scale waves which modulate the layers. The large-scale waves may also serve as seed irregularities for ESF. A three-dimensional electrodynamic model is constructed that can reproduce the observed shear flow. Based on the model, we calculate the linear growth rate for the collisional shear instability and show that it can compete with the generalized Rayleigh Taylor instability. A scenario where the former generates the large-scale waves and initiates the latter is discussed.

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