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| Titel |
Empirical models of Total Electron Content based on functional fitting over Taiwan during geomagnetic quiet condition |
| VerfasserIn |
Y. Kakinami, C. H. Chen, J. Y. Liu, K.-I. Oyama, W. H. Yang, S. Abe |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 8 ; Nr. 27, no. 8 (2009-08-26), S.3321-3333 |
| Datensatznummer |
250016633
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| Publikation (Nr.) |
 copernicus.org/angeo-27-3321-2009.pdf |
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| Zusammenfassung |
| Empirical models of Total Electron Content (TEC) based on functional fitting
over Taiwan (120° E, 24° N) have been constructed using data of the
Global Positioning System (GPS) from 1998 to 2007 during geomagnetically
quiet condition (Dst>−30 nT). The models provide TEC as functions of
local time (LT), day of year (DOY) and the solar activity (F), which are
represented by 1–162 days mean of F10.7 and EUV. Other models based on
median values have been also constructed and compared with the models based
on the functional fitting. Under same values of F parameter, the models
based on the functional fitting show better accuracy than those based on the
median values in all cases. The functional fitting model using daily EUV is
the most accurate with 9.2 TECu of root mean square error (RMS) than the
15-days running median with 10.4 TECu RMS and the model of International
Reference Ionosphere 2007 (IRI2007) with 14.7 TECu RMS. IRI2007
overestimates TEC when the solar activity is low, and underestimates TEC
when the solar activity is high. Though average of 81 days centered running
mean of F10.7 and daily F10.7 is often used as indicator of EUV, our result
suggests that average of F10.7 mean from 1 to 54 day prior and current day
is better than the average of 81 days centered running mean for reproduction
of TEC. This paper is for the first time comparing the median based model
with the functional fitting model. Results indicate the functional fitting
model yielding a better performance than the median based one. Meanwhile we
find that the EUV radiation is essential to derive an optimal TEC. |
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