Effects observed in the Latin American sector ionospheric F region during the intense geomagnetic disturbances in the early part of November 2004

Y. Sahai, F. Becker-Guedes, P. R. Fagundes, R. De Jesus, A. J. De Abreu, L. J. Paxton, Larisa Petrovna Goncharenko, C. Brunini, M. Gende, A. S. Ferreira, N. S. Lima, F. L. Guamieri, V. G. Pillat, J. A. Bittencourt, C. M.N. Candido

Research output: Contribution to journalArticle

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Abstract

The Sun was very active in the early part of November 2004. During the period of 8-10 November 2004, intense geomagnetic disturbances with two superstorms were observed. In this paper, we have investigated the generation and suppression of equatorial ionospheric irregularities and the daytime changes in the F region electron density in the Latin American sector during the period of intense geomagnetic disturbances. We present the ionospheric sounding observations carried out at Manaus and Sao Jose dos Campos, Brazil, during this geomagnetically disturbed period. Also, GPS observations obtained from several stations in Brazil, Argentina, and St. Croix, U.S. Virgin Islands, during the disturbed period are presented. During the main phase of the first superstorm, around the prereversal enhancement time (night of 7-8 November), prompt penetration of electric field was observed and the presence of equatorial ionospheric irregularities was detected from St. Croix, U.S. Virgin Islands (in the northern hemisphere) to Bahia Blanca, Argentina (in the southern hemisphere). The ionospheric sounding observations at Manaus indicate inhibition of prereversal. enhancement on the nights of 9-10 and 10-11 November, possibly due to the disturbed thermospheric winds or disturbance electric fields. Virtually no phase fluctuations on the nights of 9-10 and 10-11 November were observed in the Latin American sector. During the daytime on 8 November, the vertical total electron content (VTEC) observations show a negative storm phase at Porto Alegre (Brazil) and Bahia Blanca (Argentina). Again during the daytime on 10 November, the VTEC observations show a negative storm phase from Brasilia (Brazil) to Bahia Blanca. These negative storm phases are associated with a decrease in the O/N2 ratio. During the daytime on 9 November, the VTEC observations show a positive storm phase extending from St. Croix to Porto Alegre, and again on 10 November, VTEC observations show a positive storm phase. These positive storm phases observed are possibly due to changes in large-scale wind circulation, and an increase in the O/N2 ratio.

Original languageEnglish
Article numberA00A19
JournalJournal of Geophysical Research: Space Physics
Volume114
Issue number1
Publication statusPublished - Jan 1 2009

Fingerprint

F region
ionospherics
disturbances
sectors
disturbance
electrons
Brazil
daytime
Virgin Islands of the United States
Argentina
Virgin Islands
ionospheric sounding
night
Electrons
electric field
irregularities
Electric fields
atmospheric circulation
electric fields
augmentation

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Sahai, Y., Becker-Guedes, F., Fagundes, P. R., De Jesus, R., De Abreu, A. J., Paxton, L. J., ... Candido, C. M. N. (2009). Effects observed in the Latin American sector ionospheric F region during the intense geomagnetic disturbances in the early part of November 2004. Journal of Geophysical Research: Space Physics, 114(1), [A00A19].

Effects observed in the Latin American sector ionospheric F region during the intense geomagnetic disturbances in the early part of November 2004. / Sahai, Y.; Becker-Guedes, F.; Fagundes, P. R.; De Jesus, R.; De Abreu, A. J.; Paxton, L. J.; Goncharenko, Larisa Petrovna; Brunini, C.; Gende, M.; Ferreira, A. S.; Lima, N. S.; Guamieri, F. L.; Pillat, V. G.; Bittencourt, J. A.; Candido, C. M.N.

In: Journal of Geophysical Research: Space Physics, Vol. 114, No. 1, A00A19, 01.01.2009.

Research output: Contribution to journalArticle

Sahai, Y, Becker-Guedes, F, Fagundes, PR, De Jesus, R, De Abreu, AJ, Paxton, LJ, Goncharenko, LP, Brunini, C, Gende, M, Ferreira, AS, Lima, NS, Guamieri, FL, Pillat, VG, Bittencourt, JA & Candido, CMN 2009, 'Effects observed in the Latin American sector ionospheric F region during the intense geomagnetic disturbances in the early part of November 2004', Journal of Geophysical Research: Space Physics, vol. 114, no. 1, A00A19.
Sahai, Y. ; Becker-Guedes, F. ; Fagundes, P. R. ; De Jesus, R. ; De Abreu, A. J. ; Paxton, L. J. ; Goncharenko, Larisa Petrovna ; Brunini, C. ; Gende, M. ; Ferreira, A. S. ; Lima, N. S. ; Guamieri, F. L. ; Pillat, V. G. ; Bittencourt, J. A. ; Candido, C. M.N. / Effects observed in the Latin American sector ionospheric F region during the intense geomagnetic disturbances in the early part of November 2004. In: Journal of Geophysical Research: Space Physics. 2009 ; Vol. 114, No. 1.
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abstract = "The Sun was very active in the early part of November 2004. During the period of 8-10 November 2004, intense geomagnetic disturbances with two superstorms were observed. In this paper, we have investigated the generation and suppression of equatorial ionospheric irregularities and the daytime changes in the F region electron density in the Latin American sector during the period of intense geomagnetic disturbances. We present the ionospheric sounding observations carried out at Manaus and Sao Jose dos Campos, Brazil, during this geomagnetically disturbed period. Also, GPS observations obtained from several stations in Brazil, Argentina, and St. Croix, U.S. Virgin Islands, during the disturbed period are presented. During the main phase of the first superstorm, around the prereversal enhancement time (night of 7-8 November), prompt penetration of electric field was observed and the presence of equatorial ionospheric irregularities was detected from St. Croix, U.S. Virgin Islands (in the northern hemisphere) to Bahia Blanca, Argentina (in the southern hemisphere). The ionospheric sounding observations at Manaus indicate inhibition of prereversal. enhancement on the nights of 9-10 and 10-11 November, possibly due to the disturbed thermospheric winds or disturbance electric fields. Virtually no phase fluctuations on the nights of 9-10 and 10-11 November were observed in the Latin American sector. During the daytime on 8 November, the vertical total electron content (VTEC) observations show a negative storm phase at Porto Alegre (Brazil) and Bahia Blanca (Argentina). Again during the daytime on 10 November, the VTEC observations show a negative storm phase from Brasilia (Brazil) to Bahia Blanca. These negative storm phases are associated with a decrease in the O/N2 ratio. During the daytime on 9 November, the VTEC observations show a positive storm phase extending from St. Croix to Porto Alegre, and again on 10 November, VTEC observations show a positive storm phase. These positive storm phases observed are possibly due to changes in large-scale wind circulation, and an increase in the O/N2 ratio.",
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AU - Sahai, Y.

AU - Becker-Guedes, F.

AU - Fagundes, P. R.

AU - De Jesus, R.

AU - De Abreu, A. J.

AU - Paxton, L. J.

AU - Goncharenko, Larisa Petrovna

AU - Brunini, C.

AU - Gende, M.

AU - Ferreira, A. S.

AU - Lima, N. S.

AU - Guamieri, F. L.

AU - Pillat, V. G.

AU - Bittencourt, J. A.

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N2 - The Sun was very active in the early part of November 2004. During the period of 8-10 November 2004, intense geomagnetic disturbances with two superstorms were observed. In this paper, we have investigated the generation and suppression of equatorial ionospheric irregularities and the daytime changes in the F region electron density in the Latin American sector during the period of intense geomagnetic disturbances. We present the ionospheric sounding observations carried out at Manaus and Sao Jose dos Campos, Brazil, during this geomagnetically disturbed period. Also, GPS observations obtained from several stations in Brazil, Argentina, and St. Croix, U.S. Virgin Islands, during the disturbed period are presented. During the main phase of the first superstorm, around the prereversal enhancement time (night of 7-8 November), prompt penetration of electric field was observed and the presence of equatorial ionospheric irregularities was detected from St. Croix, U.S. Virgin Islands (in the northern hemisphere) to Bahia Blanca, Argentina (in the southern hemisphere). The ionospheric sounding observations at Manaus indicate inhibition of prereversal. enhancement on the nights of 9-10 and 10-11 November, possibly due to the disturbed thermospheric winds or disturbance electric fields. Virtually no phase fluctuations on the nights of 9-10 and 10-11 November were observed in the Latin American sector. During the daytime on 8 November, the vertical total electron content (VTEC) observations show a negative storm phase at Porto Alegre (Brazil) and Bahia Blanca (Argentina). Again during the daytime on 10 November, the VTEC observations show a negative storm phase from Brasilia (Brazil) to Bahia Blanca. These negative storm phases are associated with a decrease in the O/N2 ratio. During the daytime on 9 November, the VTEC observations show a positive storm phase extending from St. Croix to Porto Alegre, and again on 10 November, VTEC observations show a positive storm phase. These positive storm phases observed are possibly due to changes in large-scale wind circulation, and an increase in the O/N2 ratio.

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