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An Ionosphere Specification Technique Based on Data Ingestion Algorithm and Empirical Orthogonal Function Analysis Method
dc.contributor.authorAa, Ercha
dc.contributor.authorRidley, Aaron
dc.contributor.authorHuang, Wengeng
dc.contributor.authorZou, Shasha
dc.contributor.authorLiu, Siqing
dc.contributor.authorCoster, Anthea J.
dc.contributor.authorZhang, Shunrong
dc.date.accessioned2018-11-20T15:33:31Z
dc.date.available2019-11-01T15:10:32Zen
dc.date.issued2018-09
dc.identifier.citationAa, Ercha; Ridley, Aaron; Huang, Wengeng; Zou, Shasha; Liu, Siqing; Coster, Anthea J.; Zhang, Shunrong (2018). "An Ionosphere Specification Technique Based on Data Ingestion Algorithm and Empirical Orthogonal Function Analysis Method." Space Weather 16(9): 1410-1423.
dc.identifier.issn1542-7390
dc.identifier.issn1542-7390
dc.identifier.urihttps://hdl.handle.net/2027.42/146373
dc.description.abstractA data ingestion method in reproducing ionospheric electron density and total electron content (TEC) was developed to incorporate TEC products from the Madrigal Database into the NeQuick 2 model. The method is based on retrieving an appropriate global distribution of effective ionization parameter (Az) to drive the NeQuick 2 model, which can be implemented through minimizing the difference between the measured and modeled TEC at each grid in the local time‐modified dip latitude coordinates. The performance of this Madrigal TEC‐driven‐NeQuick 2 result is validated through the comparison with various International Global Navigation Satellite Systems Services global ionospheric maps and ionosonde data. The validation results show that a general accuracy improvement of 30–50% can be achieved after data ingestion. In addition, the empirical orthogonal function (EOF) analysis technique is used to construct a parameterized time‐varying global Az model. The quick convergence of EOF decomposition makes it possible to use the first six EOF series to represent over 90% of the total variances. The intrinsic diurnal variation and spatial distribution in the original data set can be well reflected by the constructed EOF base functions. The associated EOF coefficients can be expressed as a set of linear functions of F10.7 and Ap indices, combined with a series of trigonometric functions with annual/seasonal variation components. The NeQuick TEC driven by EOF‐modeled Az shows 10–15% improvement in accuracy over the standard ionosphere correction algorithm in the Galileo navigation system. These preliminary results demonstrate the effectiveness of the combined data ingestion and EOF modeling technique in improving the specifications of ionospheric density variations.Key PointsThe Madrigal TEC data are ingested into the NeQuick 2 model through deriving an effective ionization parameter (Az)The Empirical Orthogonal Function (EOF) analysis technique is used to construct a parameterized time‐varying Az model to make a predictionThe TEC data ingestion and EOF modeling are effective in bringing certain systematic improvement of ionosphere now‐cast/forecast
dc.publisherDarmstadt
dc.publisherWiley Periodicals, Inc.
dc.subject.otherNeQuick 2 model
dc.subject.otherEOF analysis method
dc.subject.otherdata ingestion
dc.subject.otherMadrigal TEC products
dc.titleAn Ionosphere Specification Technique Based on Data Ingestion Algorithm and Empirical Orthogonal Function Analysis Method
dc.typeArticleen_US
dc.rights.robotsIndexNoFollow
dc.subject.hlbsecondlevelElectrical Engineering
dc.subject.hlbtoplevelEngineering
dc.description.peerreviewedPeer Reviewed
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/146373/1/swe20760_am.pdf
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/146373/2/swe20760.pdf
dc.identifier.doi10.1029/2018SW001987
dc.identifier.sourceSpace Weather
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dc.owningcollnameInterdisciplinary and Peer-Reviewed


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