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| Titel |
Observations of the F-region ionospheric irregularities in the South American sector during the October 2003 "Halloween Storms" |
| VerfasserIn |
Y. Sahai, F. Becker-Guedes, P. R. Fagundes, A. J. Abreu, R. Jesus, V. G. Pillat, J. R. Abalde, C. R. Martinis, C. Brunini, M. Gende, C.-S. Huang, X. Pi, W. L. C. Lima, J. A. Bittencourt, Y. Otsuka |
| 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. 12 ; Nr. 27, no. 12 (2009-12-08), S.4463-4477 |
| Datensatznummer |
250016724
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| Publikation (Nr.) |
 copernicus.org/angeo-27-4463-2009.pdf |
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| Zusammenfassung |
The response of the ionospheric F-region in the South American sector during
the super geomagnetic storms on 29 and 30 October 2003 is studied in the
present investigation.
In this paper, we present ionospheric sounding observations during the
period 29–31 October 2003 obtained at Palmas (a near equatorial location)
and Sao Jose dos Campos (a location under the southern crest of the
equatorial ionospheric anomaly), Brazil, along with observations during the
period 27–31 October 2003 from a chain of GPS stations covering the South
American sector from Imperatriz, Brazil, to Rio Grande, Argentina. Also,
complementary observations that include sequences of all-sky images of the
OI 777.4 and 630.0 nm emissions observed at El Leoncito, Argentina, on the
nights of 28–29 (geomagnetically quiet night) and 29–30 (geomagnetically
disturbed night) October 2003, and ion densities observed in the South
American sector by the DMSP F13, F14 and F15 satellites orbiting at about
800 km on 29 and 30 October 2003 are presented. In addition, global TEC maps
derived from GPS observations collected from the global GPS network of International GPS Service (IGS) are presented, showing
widespread and drastic TEC changes during the different phases of the
geomagnetic disturbances. The observations indicate that the equatorial
ionospheric irregularities or plasma bubbles extend to the Argentinean
station Rawson (geom. Lat. 33.1° S) and map at the magnetic equator at
an altitude of about 2500 km. |
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