%0 Journal Article
%4 sid.inpe.br/mtc-m21d/2023/11.03.17.32
%2 sid.inpe.br/mtc-m21d/2023/11.03.17.32.40
%@doi 10.1029/2023JA031477
%@issn 2169-9402
%T Daytime Medium Scale Traveling Ionospheric Disturbances (MSTIDS) Over the Andes Mountains at Equatorial and Low Magnetic Latitudes
%D 2023
%8 Oct.
%9 journal article
%A Figueiredo, Cosme Alexandre Oliveira Barros,
%A Wrasse, Cristiano Max,
%A Vadas, S.,
%A Takahashi, Hisao,
%A Otsuka, Y.,
%A Nyassor, Prosper Kwamla,
%A Shiokawa, K.,
%A Paulino, I.,
%A Silva, Diego Barros,
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Northwest Research Associates
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Nagoya University
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Nagoya University
%@affiliation Universidade Federal de Campina Grande (UFCG)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@electronicmailaddress cosme.figueiredo@inpe.br
%@electronicmailaddress cristiano.wrasse@inpe.br
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress prosper.nyassor@inpe.br
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress diego.barros@inpe.br
%B Journal of Geophysical Research: Space Physics
%V 128
%N 10
%P e2023JA031477
%K detrended TEC, the Andes Mountains, traveling ionospheric disturbances.
%X We analyze daytime quiet-time MSTIDs between 2013 and 2015 at the geomagnetic equatorial and low latitude regions of the Chilean and Argentinian Andes using keograms of detrended total electron content (dTEC). The MSTIDs had a higher occurrence rate at geomagnetic equatorial latitudes in the June solstice (winter) and spring (SON). The propagation directions changed with the season: summer (DJF) [southeast, south, southwest, and west], winter (JJA) [north and northeast], and equinoxes [north, northeast, south, southwest, and west]. In addition, the MSTIDs at low latitudes observed between 8:00 and 12:00 UT occur more often during the December solstice and propagate northwestward and northeastward. After 12:00 UT, they are mostly observed in the equinoxes and June solstice. Their predominant propagation directions depend on the season: summer (all directions with a preference for northeastward), autumn (MAM) [north and northeast], winter (north and northeast), and spring (north, northeast, and southwest). The MSTID propagation direction at different latitudes was explained by the location of the possible sources. Besides, we calculated MSTIDs parameters at geomagnetic low latitudes over the Andes Mountains and compared them with those estimated at the geomagnetic equatorial latitudes. We found that the former is smaller on average than the latter. Also, our observations validate recent model results obtained during geomagnetically quiet-time as well as daytime MSTIDs during winter over the south of South America. These results suggest that secondary or high-order gravity waves (GWs) from orographic forcing are the most likely source of these MSTIDs.
%@language en
%3 JGR Space Physics - 2023 - Figueiredo - Daytime Medium Scale Traveling Ionospheric Disturbances MSTIDS Over the Andes.pdf