Zonal plasma drift shear and low gravity effects on the 5-m irregularities in the equatorial F region over São Luís, Brazil

Details Zonal plasma drift shear and low gravity effects on the 5-m irregularities in the equatorial F region over São Luís, Brazil Zonal plasma drift shear and low gravity effects on the 5-m irregularities in the equatorial F region over São Luís, Brazil

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa51d1653d&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA51D-1653

Statistics

[2439] Ionosphere / Ionospheric Irregularities

Scientific paper

The statistics of pre-midnight 5-m irregularities in the equatorial F region over São Luís is presented. The data set ranges from October 2001 to December 2008 and covers maximum to minimum solar flux epoch. The variabilities in the irregularity parameters, namely, height and time of their appearance in radar, with solar-flux variation are presented. The seasonal variations (combined over all years, irrespective of solar-flux) of occurrence of irregularities, occurrence of bottom-side layer without and with plume are presented. The largest occurrence of bottom-side layer without and with plume are found on April (equinox) and December (summer) months, respectively. The ambient ionospheric conditions namely prereversal evening vertical drift, bottomside density gradient and off-equatorial E region conductivity are inferred using digisonde measurements during April 2002 and December 2002. Based on these conditions and recent studies on gravity wave climatology over Brazil, it is suggested that shear in zonal plasma drift and low gravity wave activity may account for less occurrence of plume during April as compared to December months. This suggestion is quantified using numerical simulation model of collisional-interchange instability (CII) and plasma bubble.

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