Nighttime Ionospheric TEC Study Over Latin America During Moderate and High Solar Activity
Por:
Romero-Hernandez, E., Denardini, C. M., Jonah, O. F., Essien, P., Picanco, G. A. S., Nogueira, P. A. B., Rodriguez-Martinez, M., Resende, L. C. A., De la Luz, V., Agular-Rodriguez, E., Sergeeva, M., Gonzalez-Esparza, J. A., Takahashi, H., Perez-Tijerina, E.
Publicada:
1 oct 2020
Categoría:
Geophysics
Resumen:
The present work is a comprehensive study of the ionospheric vertical
total electron content (vTEC) variations during the nighttime, based on
data collected by ground-based Global Navigation Satellite System (GNSS)
receivers over the Latin American region. We provide a qualitative and
quantitative analysis of the ionospheric vTEC trend at 21:00, 00:00, and
03:00 local time (LT), during geomagnetically undisturbed days of 2011
(ascending phase) and 2014 (maximum phase), which encompassed (a) the
response to the solar flux variation, (b) the seasonal trend in
different latitudes and longitudes, and (c) the interhemispheric
asymmetry. One significant result of this study is the development of
TEC maps for the Latin American region, which are used for the
monitoring and forecasting of the ionosphere for space weather purposes.
The nighttime vTEC variations showed a strong latitudinal dependence,
especially in the Northern Hemisphere. For 2011, the semiannual anomaly
was similar to that observed in daytime; however, in 2014, the receivers
at midlatitude presented asymmetric behavior. Similarly, the nighttime
winter anomaly (NWA) was very weak in both years. The Equatorial
Ionospheric Anomaly (EIA) signature was absent from June to August, a
period in which the hemispheric disparity in the vTEC values became more
evident, suggesting a feeble interhemispheric circulation. The
Midlatitude Summer Nighttime Anomaly (MSNA) was also identified in the
Southern Hemisphere, during January and February of 2011 (moderate solar
activity). Model approximations suggest that the equatorward winds and
the EIA were involved in the formation of the MSNA.
Filiaciones:
Romero-Hernandez, E.:
(Corresponding Author), Univ Autonoma Nuevo Leon, Fac Ciencias Fis Matemat, LANCE, Monterrey, Mexico
Denardini, CM (Corresponding Author), Inst Nacl Pesquisas Espaciais, Sao Jose Dos Campos, Brazil
Univ Autonoma Nuevo Leon, Fac Ciencias Fis Matemat, LANCE, Monterrey, Mexico
Inst Nacl Pesquisas Espaciais, Sao Jose Dos Campos, Brazil
Denardini, C. M.:
Inst Nacl Pesquisas Espaciais, Sao Jose Dos Campos, Brazil
Jonah, O. F.:
MIT, Haystack Observ, Westford, MA 01886 USA
Essien, P.:
Inst Nacl Pesquisas Espaciais, Sao Jose Dos Campos, Brazil
Picanco, G. A. S.:
Inst Nacl Pesquisas Espaciais, Sao Jose Dos Campos, Brazil
Nogueira, P. A. B.:
Inst Fed Educ Ciencia & Tecnol Sao Paulo, Jacarei, Brazil
Rodriguez-Martinez, M.:
Univ Nacl Autonoma Mexico, Escuela Nacl Estudios Super, Unidad Morelia, Mexico City, DF, Mexico
Resende, L. C. A.:
Inst Nacl Pesquisas Espaciais, Sao Jose Dos Campos, Brazil
State Key Lab Space Weather, Beijing, Peoples R China
De la Luz, V.:
Univ Nacl Autonoma Mexico, Escuela Nacl Estudios Super, Unidad Morelia, Mexico City, DF, Mexico
Agular-Rodriguez, E.:
Univ Nacl Autonoma Mexico, Inst Geofis, LANCE, Unidad Michoacan, Morelia, Michoacan, Mexico
Sergeeva, M.:
Univ Nacl Autonoma Mexico, Inst Geofis, LANCE, Unidad Michoacan, Morelia, Michoacan, Mexico
Univ Nacl Autonoma Mexico, Inst Geofis, CONACYT, Unidad Michoacan, Morelia, Michoacan, Mexico
Gonzalez-Esparza, J. A.:
Univ Nacl Autonoma Mexico, Inst Geofis, LANCE, Unidad Michoacan, Morelia, Michoacan, Mexico
Takahashi, H.:
Inst Nacl Pesquisas Espaciais, Sao Jose Dos Campos, Brazil
Perez-Tijerina, E.:
Univ Autonoma Nuevo Leon, Fac Ciencias Fis Matemat, LANCE, Monterrey, Mexico
|