Using principal component analysis of satellite and ground magnetic data to model the equatorial electrojet and derive its tidal composition

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dc.contributor.author Soares, Gabriel
dc.contributor.author Yamazaki, Yosuke
dc.contributor.author Morschhauser, Achim
dc.contributor.author Matzka, Jürgen
dc.contributor.author Pinheiro, Katia J.
dc.contributor.author Stolle, Claudia
dc.contributor.author Alken, Patrick
dc.contributor.author Yoshikawa, Akimasa
dc.contributor.author Hozumi, Kornyanat
dc.contributor.author Kulkarni, Atul
dc.contributor.author Supnithi, Pornchai
dc.date.accessioned 2022-11-11T04:45:52Z
dc.date.available 2022-11-11T04:45:52Z
dc.date.issued 2022
dc.identifier.citation JGR-Space Physics, 10.1029/2022JA030691 en_US
dc.identifier.uri http://library.iigm.res.in:8080/xmlui/handle/123456789/1682
dc.description.abstract The intensity of the equatorial electrojet (EEJ) shows temporal and spatial variability that is not yet fully understood nor accurately modeled. Atmospheric solar tides are among the main drivers of this variability but determining different tidal components and their respective time series is challenging. It requires good temporal and spatial coverage with observations, which, previously could only be achieved by accumulating data over many years. Here, we propose a new technique for modeling the EEJ based on principal component analysis (PCA) of a hybrid ground-satellite geomagnetic data set. The proposed PCA-based model (PCEEJ) represents the observed EEJ better than the climatological EEJM-2 model, especially when there is good local time separation among the satellites involved. The amplitudes of various solar tidal modes are determined from PCEEJ based tidal equation fitting. This allows to evaluate interannual and intraannual changes of solar tidal signatures in the EEJ. On average, the obtained time series of migrating and nonmigrating tides agree with the average climatology available from earlier work. A comparison of tidal signatures in the EEJ with tides derived from neutral atmosphere temperature observations show a remarkable correlation for nonmigrating tides such as DE3, DE2, DE4, and SW4. The results indicate that it is possible to obtain a meaningful EEJ spectrum related to solar tides for a relatively short time interval of 70 days. en_US
dc.language.iso en en_US
dc.subject Principal Component Analysis en_US
dc.subject Ground Magnetic Data en_US
dc.subject Equatorial Electrojet en_US
dc.subject Tidal Composition en_US
dc.title Using principal component analysis of satellite and ground magnetic data to model the equatorial electrojet and derive its tidal composition en_US
dc.type Article en_US


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