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| Titel |
First assimilations of COSMIC radio occultation data into the Electron Density Assimilative Model (EDAM) |
| VerfasserIn |
M. J. Angling |
| 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 ; 26, no. 2 ; Nr. 26, no. 2 (2008-02-26), S.353-359 |
| Datensatznummer |
250016028
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| Publikation (Nr.) |
 copernicus.org/angeo-26-353-2008.pdf |
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| Zusammenfassung |
| Ground based measurements of slant total electron content (TEC) can be
assimilated into ionospheric models to produce 3-D representations of
ionospheric electron density. The Electron Density Assimilative Model (EDAM)
has been developed for this purpose. Previous tests using EDAM and ground
based data have demonstrated that the information on the vertical structure
of the ionosphere is limited in this type of data. The launch of the COSMIC
satellite constellation provides the opportunity to use radio occultation
data which has more vertical information. EDAM assimilations have been run
for three time periods representing quiet, moderate and disturbed
geomagnetic conditions. For each run, three data sets have been ingested –
only ground based data, only COSMIC data and both ground based and COSMIC
data. The results from this preliminary study show that both ground and
space based data are capable of improving the representation of the vertical
structure of the ionosphere. However, the analysis is limited by the
incomplete deployment of the COSMIC constellation and the use of auto-scaled
ionosonde data. The first of these can be addressed by repeating this type
of study once full deployment has been achieved. The latter requires the
manual scaling of ionosonde data; ideally an agreed data set would be scaled
and made available to the community to facilitate comparative testing of
assimilative models. |
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