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| Titel |
Response of the equatorial and low-latitude ionosphere during the space weather events of April 2002 |
| VerfasserIn |
W. L. C. Lima, F. Becker-Guedes, Y. Sahai, P. R. Fagundes, J. R. Abalde, G. Crowley, J. A. Bittencourt |
| 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 ; 22, no. 9 ; Nr. 22, no. 9 (2004-09-23), S.3211-3219 |
| Datensatznummer |
250015001
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| Publikation (Nr.) |
 copernicus.org/angeo-22-3211-2004.pdf |
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| Zusammenfassung |
| A digital ionosonde, of the type known as Canadian Advanced Digital
Ionosonde (CADI), has been in routine operation at São José dos
Campos (23.2° S, 45.9° W; dip latitude 17.6° S), Brazil, since
August 2000. A new CADI was installed at Palmas (10.2° S, 48.2° W;
dip latitude 5.5° S), Brazil, in April 2002. The two CADIs are part of a
new network being established in a collaborative program between UNIVAP and
CEULP/ULBRA, to study the equatorial and low-latitude ionospheric regions in
Brazil. In this paper we present and discuss the effects of the space
weather events during 17-20 April 2002, as evidenced by the ionospheric
parameter changes from simultaneous observations at São José dos
Campos and Palmas. A comparison of the observed ionospheric parameters (h'F,
hpF2 and foF2) at the two stations, separated only by about 1460km, shows
both similarities and differences associated with the geomagnetic
disturbances. Also, a comparison of the observed F-region parameters with
the ASPEN-TIMEGCM model results is presented. The model results show
reasonable agreement during the quiet period of observations, but some
discrepancies have been observed during the geomagnetic disturbances. |
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