Large-scale Electric Field Structures in the Daytime Equatorial Electrojet Oobserved From Alcontara, Brazil

Details Large-scale Electric Field Structures in the Daytime Equatorial Electrojet Oobserved From Alcontara, Brazil Large-scale Electric Field Structures in the Daytime Equatorial Electrojet Oobserved From Alcontara, Brazil

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa31a01p&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SA31A-01

Physics

2411 Electric Fields (2712), 2415 Equatorial Ionosphere

Scientific paper

During the Guar Rocket/Radar Campaign conducted from August-October, 1994, three NASA rockets were launched from Alcontara, Brazil that returned detailed measurements of the DC electric fields, current density, and plasma number density within the unstable daytime equatorial electrojet. The electric field and plasma density data reveal considerable structuring in the middle and lower portion of the electrojet (90-105 km) where the ambient plasma density gradient is unstable. Although the electric field amplitudes are largest (~10-15 mV/m) in the zonal direction, considerable structure (~5-10 mV/m) is also observed in the vertical electric field component as well, implying that the dominant large scale waves involve significant vertical interaction and coupling within the narrow altitude range where they are observed. Furthermore, a detailed examination of the phase of the waveforms show that on some, but not all occasions, locally enhanced eastward fields are associated with locally enhanced upwards (polarization) electric fields, in a manner suggested by Kudeki et al. [JGR, 90, p. 429, 1985] to explain backscatter radar spectral asymmetries. The largest amplitude waveforms imply scales of ~0.5-1.5 km, although the spectrum of irregularities is quite broad, extending to less than 10m. Indeed, evidence for secondary two stream and gradient drift waves is also observed. For each flight, simultaneous VHF CUPRI backscatter vertical echoes also show the presence of both large scale waves and secondary 3 m structures within the same regions. The measurements are discussed in terms of theories involving the non-linear evolution and structuring of plasma waves in the daytime equatorial electrojet.

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