What is it about?
We used the GNSS receivers and digisondes data to study the characteristics of TEC perturbation associated with Medium Scale Traveling Ionospheric Disturbances (MSTIDs) during daytime over the Brazilian sector. Possible mechanisms responsible for the daytime MSTIDs actives were also investigated by using data from radio occultation satellite data from COSMIC mission. The Atmospheric Gravity Wave (AGW) was identified as the principal source of the observed daytime MSTIDs.
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Why is it important?
TEC perturbation associated with MSTIDs play important roles in the dynamics of the Earth’s atmosphere such as the coupling between the lower, middle and upper atmosphere and they are harmful to radio wave propagations.
Perspectives
Apart from the interesting novel study about the daytime MSTIDs over the Brazilian sector, this article also illustrates the day-to-day coupling of the lower atmosphere with the upper atmosphere. The authors investigated the day-to-day upward propagations of AGW from the tropospheric level up to the thermospheric height and how these AGWs manifest themselves as MSTIDs in the ionosphere.
Dr Olusegun F Jonah
National Institute for Space Research (INPE)
Read the Original
This page is a summary of: Observation of TEC perturbation associated with medium-scale traveling ionospheric disturbance and possible seeding mechanism of atmospheric gravity wave at a Brazilian sector, Journal of Geophysical Research Space Physics, March 2016, American Geophysical Union (AGU),
DOI: 10.1002/2015ja022273.
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