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| Titel |
The ionospheric responses to the 11 August 1999 solar eclipse: observations and modeling |
| VerfasserIn |
H. Le, L. Liu, X. Yue, W. Wan |
| 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. 1 ; Nr. 26, no. 1 (2008-02-04), S.107-116 |
| Datensatznummer |
250016006
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| Publikation (Nr.) |
 copernicus.org/angeo-26-107-2008.pdf |
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| Zusammenfassung |
| A total eclipse occurred on 11 August 1999 with its path of totality
passing over central Europe in the latitude range 40°–50° N. The
ionospheric responses to this eclipse were measured by a wide ionosonde
network. On the basis of the measurements of foE, foF1, and foF2 at sixteen
ionosonde stations in Europe, we statistically analyze the variations of
these parameters with a function of eclipse magnitude. To model the eclipse
effects more accurately, a revised eclipse factor, FR, is constructed to
describe the variations of solar radiation during the solar eclipse. Then we
simulate the effect of this eclipse on the ionosphere with a mid- and low-latitude
ionosphere theoretical model by using the revised eclipse factor
during this eclipse. Simulations are highly consistent with the observations
for the response in the E-region and F1-region. Both of them show that the
maximum response of the mid-latitude ionosphere to the eclipse is found in
the F1-region. Except the obvious ionospheric response at low altitudes
below 500 km, calculations show that there is also a small response at high
altitudes up to about 2000 km. In addition, calculations show that when the
eclipse takes place in the Northern Hemisphere, a small
ionospheric disturbance also appeared in the conjugate hemisphere. |
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