scholarly journals Statistical analysis of the occurrence of medium-scale traveling ionospheric disturbances over Brazilian low latitudes using OI 630.0 nm emission all-sky images

2008 ◽  
Vol 35 (17) ◽  
Author(s):  
C. M. N. Candido ◽  
A. A. Pimenta ◽  
J. A. Bittencourt ◽  
F. Becker-Guedes
Keyword(s):  
Statistical Analysis ◽  
Ionospheric Disturbances ◽  
Medium Scale ◽  
Traveling Ionospheric Disturbances ◽  
Low Latitudes

scholarly journals 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

2012 ◽  
Vol 30 (2) ◽  
Author(s):  
Danielle Cristina de Morais Amorim ◽  
Alexandre Alvares Pimenta ◽  
Aline Amorim de Almeida
Keyword(s):  
Statistical Analysis ◽  
Maximum Activity ◽  
Occurrence Rate ◽  
Ionospheric Disturbances ◽  
Low Latitude ◽  
Medium Scale ◽  
Airglow Emission ◽  
Traveling Ionospheric Disturbances ◽  
A Minor

In order to characterize the phenomenon known as Medium-Scale Traveling Ionospheric Disturbances (MSTIDs), we present in this paper the resultsobtained 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 obtainedby 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. Duringsolar 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.

Sign in / Sign up

Export Citation Format

Share Document