%0 Journal Article
%4 dpi.inpe.br/plutao/2012/11.28.16.49.27
%2 dpi.inpe.br/plutao/2012/11.28.16.49.28
%@issn 0102-261X
%F lattes: 4540882358553916 1 AmorimPimeAlme:2012:CHMETR
%T Characterization of medium-scale traveling ionospheric disturbances in the brazilian low latitude sector statistical analysis of all-sky images of oi 630 nm airglow emission
%D 2012
%A Amorim, Danielle Cristina de Morais,
%A Pimenta, Alexandre Alvares,
%A Almeida, A. A.,
%@affiliation
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@electronicmailaddress danielle@laser.inpe.br
%B Revista Brasileira de Geofísica
%V 30
%N 2
%P 129-136
%K MSTIDs, airglow, Perkins instability.
%X In order to characterize the phenomenon known as Medium-Scale Traveling Ionospheric Disturbances (MSTIDs), we present in this paper the results obtained from the statistical analysis of 10.5 years all-sky images of OI 630 nm airglow emission over the Brazilian low latitude sector. The images, which were obtained by an all-sky imager installed at Cachoeira Paulista (22.7◦S, 45◦W), show dark band structures propagating from southeast to northwest with velocities of 50-200 m/s. Our results show the greatest occurrence of MSTIDs during solar minimum and a minor occurrence rate during descending and ascending solar activity periods. During solar maximum activity we have not detected MSTIDs signatures on all-sky images. In relation to seasonality, the greatest frequency of occurrence is during local winter. All detected events have occurred during geomagnetically quiet conditions (Kp<3). Possible mechanisms of generation of this phenomenon are discussed.
%@language en
%3 86-272-1-PB.pdf
%U http://sys2.sbgf.org.br/revista/index.php/rbgf/article/view/86/41