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“ EQUATORIAL TEC OVER SOUTH AMERICAN SECTOR WITH DIFFERENT MAGNETIC DECLINATION ANGLES”

“ EQUATORIAL TEC OVER SOUTH AMERICAN SECTOR WITH DIFFERENT MAGNETIC DECLINATION ANGLES”. P. A. B. Nogueira *1 , M. A. Abdu 1 , J. R. Souza 1 , I. S. Batista 1 , E. B. Shume 1 , R.Y.C. Cueva 1 , C.V. Ely 1 , G. J. Bailey 2 .

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“ EQUATORIAL TEC OVER SOUTH AMERICAN SECTOR WITH DIFFERENT MAGNETIC DECLINATION ANGLES”

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  1. “EQUATORIAL TEC OVER SOUTH AMERICAN SECTOR WITH DIFFERENT MAGNETIC DECLINATION ANGLES” P. A. B. Nogueira*1, M. A. Abdu1 , J. R. Souza1, I. S. Batista1, E. B. Shume1, R.Y.C. Cueva1, C.V. Ely1, G. J. Bailey2. 1Instituto Nacional de Pesquisas Espaciais, Caixa Postal 515, São José dos Campos, SP, Brasil; 2Department of Applied Mathematics, University of Sheffield, Sheffield, S3 7RH, U.K

  2. Abstract • TEC longitudinal variation; • Magnetic Declination Angles Dependence; • São Luís (2.33° S, 315.8ºE, declination = -19o) in Brazil • Arequipa (16.5°S, 288.5ºE, declination = 0.5o) in Perú • TEC variations for three solar activity levels; • TEC values over São Luís are larger than that ones over Arequipa; • SUPIM model has been used to investigate such difference.

  3. TEC Longitudinal Variation • It is well known: • TEC data show strong annual/semiannual, solar cycle, and 27-days variations. • However, it is not known: • How is the TEC variation associated with different magnetic declination angles?

  4. TEC Temporal Pattern and Magnetic Declination Angle Effect • It is well known that the magnetic declination angle may affect: • The PRE vertical ExB drift (Batista et al., 1986); • The plasma bubble development (Abdu et al., 1981); • EEJ pattern (Shumeet al., 2010).

  5. GPS Receivers Station São Luís GPS Receiver: Turbo Rogue ICS-400Z Allen-Osborne Associates Receivers. Arequipa: GPS Receiver ROGUE SNR-8000

  6. TEC Seasonal Variation- 2001

  7. Local Time Comparison: 0 – 6 LT

  8. Local Time Comparison: 6 – 12 LT

  9. Local Time Comparison: 12 – 18 LT

  10. Local Time Comparison: 18 – 24 LT

  11. foF2 Seasonal Variation- 2001

  12. SUPIM MODEL

  13. Observational Data vsIonosphericModelling

  14. Observational Data vsIonosphericModelling

  15. TEC SeasonalVariation- 2005

  16. TEC SeasonalVariation - 2007

  17. Changing SL GPS Receiver São Luís: GPS Receiver NetR5 - 4651K03649 Arequipa: GPS Receiver ROGUE SNR-8000

  18. TEC Semiannual Variation Period

  19. Summary • TEC semiannual variation during daytime was establish, with two peak located over the equinoctial condition. • The period of the TEC semiannual variation is better represented over high solar activity with period equal to ~185 days. • The highest TEC magnitude was found over São Luís, the main reason for this feature could be attributed to the large negative declination angle over Brazil.

  20. ACKNOWLEDGEMENT Paulo A. B. Nogueira acknowledges the supports from CNPQ for his PhD program.

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