“ EQUATORIAL TEC OVER SOUTH AMERICAN SECTOR WITH DIFFERENT MAGNETIC DECLINATION ANGLES”
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“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 . 1 Instituto Nacional de Pesquisas Espaciais, Caixa Postal 515, São José dos Campos, SP, Brasil; 2 Department of Applied Mathematics, University of Sheffield, Sheffield, S3 7RH, U.K
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“ 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 . - PowerPoint PPT Presentation
Transcript of “ 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. 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
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.
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?
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 (Shume et al., 2010).
GPS Receivers Station
Arequipa: GPS ReceiverROGUE SNR-8000
São Luís GPS Receiver:Turbo Rogue ICS-400Z Allen-Osborne Associates Receivers.
TEC Seasonal Variation- 2001
Local Time Comparison: 0 – 6 LT
Local Time Comparison: 6 – 12 LT
Local Time Comparison: 12 – 18 LT
Local Time Comparison: 18 – 24 LT
foF2 Seasonal Variation- 2001
SUPIM MODEL
0 30 60 90 120 150 180 210 240 270 300 330 3600
3
6
9
12
15
18
21
24
LOCA
L TI
ME
DOY
0
50,00
100,0
150,0
180,0
SAO LUIS - TEC SUPIM (HWM-93) - 2001
0 30 60 90 120 150 180 210 240 270 300 330 3600
3
6
9
12
15
18
21
24
LOCA
L TI
ME
DOY
0
50,00
100,0
150,0
180,0
AREQUIPA - TEC SUPIM (HWM-93) - 2001
0 30 60 90 120 150 180 210 240 270 300 330 3600
3
6
9
12
15
18
21
24
LOCA
L TI
ME
DOY
0
50,00
100,0
150,0
180,0
SAO LUIS - TEC SUPIM (HWM-07) - 2001
0 30 60 90 120 150 180 210 240 270 300 330 3600
3
6
9
12
15
18
21
24
LOCA
L TI
ME
DOY
0
50,00
100,0
150,0
180,0
AREQUIPA - TEC SUPIM (HWM-07) - 2001
Observational Data vs Ionospheric Modelling
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
15
SL AREQ
46
74 105
135
2001
166
196 227
258 288
319
LOCAL TIME
TEC
349
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
15
SL AREQ
46
74 105
135
2001 - SUPIM Results
166
HWM-93SOLAR2000S&F 1999NRLMSISE-00
196 227
2580 3 6 9 12 15 18 21 240
50100150
288
0 3 6 9 12 15 18 21 24050
100150
319
LOCAL TIME
TEC
349
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
15
Observational Modelling
46
74 105
135
2001 - AREQ
166
HWM-2007SOLAR2000S&F 1999NRLMSISE-00
196 227
258 288
319
LOCAL TIME
TEC
349
Observational Data vs Ionospheric Modelling
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
0 3 6 9 12 15 18 21 24050
100150
15
Observational Modelling
46
74 105
135
2001 - SL
166
196 227
258 288
319
LOCAL TIME
TEC
HWM-2007SOLAR2000S&F 1999NRLMSISE-00
349
TEC Seasonal Variation- 2005
TEC Seasonal Variation - 2007
Changing SL GPS Receiver
São Luís: GPS ReceiverNetR5 - 4651K03649
Arequipa: GPS ReceiverROGUE SNR-8000
TEC Semiannual Variation Period
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.
ACKNOWLEDGEMENT
Paulo A. B. Nogueira acknowledges the supports from CNPQ for his PhD program.
