Climatology of gravity waves-induced electric fields in the equatorial E region

Details Climatology of gravity waves-induced electric fields in the equatorial E region Climatology of gravity waves-induced electric fields in the equatorial E region

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11411308a&link_type=abstract

Journal of Geophysical Research, Volume 114, Issue A11, CiteID A11308

Physics

2

Ionosphere: Equatorial Ionosphere, Ionosphere: Electric Fields (2712), Radio Science: Ionospheric Physics (1240, 2400), Atmospheric Composition And Structure: Middle Atmosphere: Energy Deposition (3334), Radio Science: Radar Atmospheric Physics (1220)

Scientific paper

Equatorial electrojet (EEJ) observations using VHF radars show backscattered echoes from two types of electron density irregularities explained by the modified two-stream (Type I) and the gradient drift (Type II) instabilities. From the Type II irregularity velocities obtained by a radar installed at São Luiz Space Observatory (2.58°S, 44.23°W, magnetic latitude 0.23°S) we have inferred the vertical electric fields (Ez). The Ez inference was based on geomagnetic field and atmospheric models. A harmonic analysis of these electric fields shows the presence of gravity waves (GW) induced oscillations in the EEJ. We calculated the ratio between GW-related electric fields and the total Ez, which is an indicator of the efficiency in the production of an additional electric field due to a gravity wave neutral wind. In the present paper we describe the methodology of analysis and discuss some characteristics of the gravity waves that could modify the equatorial ionospheric electric fields.

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