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| Titel |
Comparing electron density between IRI-2007 and CHAMP, GRACE observation during recent solar minimum |
| VerfasserIn |
Chao Xiong, Hermann Lühr |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250045663
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| Zusammenfassung |
| We compare electron density predictions of the International Reference Ionosphere
(IRI-2007) model with in-situ measurements of the satellites CHAMP and GRACE for the
years 2000-2009. Orbital-averages of the electron density are considered. During the first half
of the period (2000-2004) measurements and collocated model predictions track each other
reasonably well at both sampling heights. From 2005 onward the overestimation of
the electron density by the model is progressively increasing. Annual averages
show that IRI-2007 values are too high by 50% for 2008 and by more than 60%
by 2009. An inspection of the latitudinal and local time distributions reveals that
the too high predictions primarily occur at low latitudes during daytime hours.
From comparison with observations it becomes obvious that IRI-2007 is strongly
overestimating the equatorial ion fountain effect during the last deep solar minimum. |
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