@Article{JonahKherPaul:2017:InCoMS,
author = "Jonah, Olusegun Folarin and Kherani, Esfhan Alam and Paula, Eurico
Rodrigues de",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)}",
title = "Investigations of conjugate MSTIDS over the Brazilian sector
during daytime",
journal = "Journal of Geophysical Research: Space Physics",
year = "2017",
volume = "122",
number = "9",
pages = "9576--9587",
month = "Sept.",
abstract = "This study focuses on the daytime medium-scale traveling
ionospheric disturbances (MSTIDs) observed at conjugate
hemispheres. It is the first time that the geomagnetical conjugate
daytime MSTIDs are observed over the South America sector. To
observe the MSTID characteristics, we used detrended total
electron content (TEC) derived from Global Navigation Satellite
Systems receivers located at Brazilian sector covering the
Northern and Southern Hemispheres along the same magnetic
meridian. The geographic grid of 1°N to 14°S in latitude and 60°S
to 50°S in longitude was selected for this study. The
cross-correlation method between two latitudes and longitudes in
time was used to observe the propagation of the MSTID waves. The
following features are noted: (a) MSTIDs are well developed at
both hemispheres; (b) the peak MSTIDs amplitudes vary from one
hemisphere to another; hence, we suppose that MSTIDs generated in
Southern Hemisphere or Northern Hemisphere mirrored in the
conjugate hemisphere; (c) the gravity wave-induced electric fields
from one hemisphere map along the field lines and generate the
mirrored MSTIDs in the conjugate region. To investigate the
hemispheric mapping mechanism, a rough approximation for the
integrated field line conductivity ratio of E and F regions is
calculated using digisonde E and F region parameters. We noted
that during the period of mapping the decrease in E region
conductivity results in an increase in total conductivity. This
shows that the E region was partially short circuited; hence,
electric field generated at F region could map to the conjugate
hemisphere during daytime: daytime MSTIDs at conjugate regions;
mechanisms responsible for daytime electrified MSTIDs; gravity
wave-induced electric field role in daytime MSTIDs.",
doi = "10.1002/2017JA024365",
url = "http://dx.doi.org/10.1002/2017JA024365",
issn = "2169-9402",
language = "en",
targetfile = "jonah_investigations.pdf",
urlaccessdate = "25 abr. 2024"
}