Equatorial electrojet irregularities investigations using a 50MHz back-scatter radar and a digisonde at Sa~o Luís: some initial results

Details Equatorial electrojet irregularities investigations using a 50MHz back-scatter radar and a digisonde at Sa~o Luís: some initial results Equatorial electrojet irregularities investigations using a 50MHz back-scatter radar and a digisonde at Sa~o Luís: some initial results

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jastp..64.1425a&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 64, Issue 12-14, p. 1425-1434.

Physics

9

Scientific paper

A new 50MHz coherent back-scatter radar has recently become operational at the Equatorial Space Observatory of INPE at Sa~o Luís (/2.33°S, /44.2°W, dip: /-0.5°), in Brazil, located close to the center of the equatorial electrojet. Preliminary results from a 12-day campaign in December 1999 involving this radar and a nearby digisonde are presented in this paper. The range-time-intensity (RTI) maps of electrojet irregularities show short-period (~5min or larger) fluctuations and significant day-to-day variability. A notable characteristic is the midday descent in the altitude of the RTI pattern observed on some days when the dominant Doppler spectra are of type-2. This feature is similar to the diurnal variation of the base height of the /q-type sporadic-/E-layer (h'Es-q) simultaneously observed by the digisonde. Quasi-periodic fluctuations in the RTI and type-1 and type-2 spectral intensities seem to indicate electric field modulation from winds associated with typical gravity wave periods. Large surges in the westward irregularity drift velocity, presenting a higher velocity tail to the Doppler spectral distribution, is observed at sunset concurrent with the evening /F-layer vertical uplift as observed by the digisonde. Some implications of these results on the /E- and /F-region electrodynamics are discussed.

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