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%0 Journal Article
%4 sid.inpe.br/mtc-m19/2011/08.02.12.08
%2 sid.inpe.br/mtc-m19/2011/08.02.12.08.45
%@issn 1364-6826
%T Equatorial electrojet plasma irregularities observed during late afternoon by the 30MHz coherent scatter radar in São Luís, Brazil
%D 2011
%8 July
%A Shume, Esayas Bellay,
%A Paula, Eurico Rodrigues de,
%A Kherani, Esfhan Alam,
%A Abdu, Mangalatayil Ali,
%A Denardini, Clézio Marcos,
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress denardini@dae.inpe.br
%B Journal of Atmospheric and Solar-Terrestrial Physics
%V 73
%N 11-12
%P 1560-1567
%K Type I and II echoes, Electrojet plasma irregularity, Electric fields.
%X Coherent scatter radar observations conducted right before twilight by the 30 MHz radar in Sao Luis (Brazil) during both quiet (December 10, 2001) and disturbed (December 12, 2001) conditions detected type I echoes on the shoulders of broad type II spectra (near zero Doppler velocity). Zonal electric fields inferred from the Sao Luis ionosonde have a larger magnitude during the period where these spectral observations were made than on December 18, 2001 when type I echoes were not observed during late afternoon. The IMF B(z) and AE index indicate that the extended geomagnetic disturbance in the afternoon of December 12, 2001 has allowed the interaction between disturbance dynamo and prompt penetration electric fields. The latter electric field component could have exceeded the former to give rise to the observed electric fields, and make possible observation of type I echoes.
%@language en


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