Análise de áreas de coerência entre estações conjugadas afetadas pela Anomalia Magnética do Atlântico Sul
DOI:
https://doi.org/10.22456/1807-9806.140792Palabras clave:
conjugate station, South Atlantic Magnetic Anomaly, correlation coefficients, wavelet coherence, space geophysic, coherence areasResumen
La Anomalía Magnética del Atlántico Sur (SAMA) es una región en el Océano Atlántico Sur donde el campo magnético de la Tierra es significativamente más débil que en otras partes del mundo. Esta anomalía ha sido de interés para los científicos e investigadores que estudian el campo magnético de la Tierra. El SAMA puede afectar los sistemas de navegación y las operaciones de los satélites, y es un área de estudio importante para comprender la dinámica del campo magnético de la Tierra. Este artículo investiga las características de la señal de estaciones conjugadas influenciadas por el SAMA en una tormenta geomagnética moderada a través del análisis de registros de estaciones geomagnéticamente conjugadas que interconectan ambos hemisferios. Este estudio utiliza las componentes magnéticas horizontales medidas en el mismo intervalo de tiempo en dos longitudes típicas: la región América-SAMA y la región Asia-Pacífico. Este procedimiento nos permite hacer un análisis comparativo entre regiones. Nuestro procedimiento utiliza los datos registrados simultáneamente en cuatro pares de estaciones conjugadas para caracterizar el dominio de coherencia de la variabilidad magnética que rodea las estaciones conjugadas. Aquí presentamos y discutimos los primeros mapas de la región SAMA, que corresponde al área de coherencia en latitudes bajas. De hecho, este concepto de área de coherencia se refiere a los bordes (área geométrica cercana al suelo) alrededor del punto conjugado, donde los fenómenos geofísicos generalmente exhiben un comportamiento fluctuante similar. Para calcular dichas áreas se utilizó la técnica de coeficientes de correlación, utilizando la componente H del campo geomagnético. Nuestros principales resultados indican que las áreas de la región de Asia y el Pacífico son similares en tamaño y forma, lo que caracteriza patrones típicos. En la región América-SAMA, las áreas de coherencia de las estaciones conjugadas no son similares en forma y tamaño. Estas diferencias entre áreas de coherencia podrían deberse a las características únicas de la región, es decir, presenta una conductividad ionosférica mejorada. Además, las estaciones geomagnéticas dentro de una amplia zona de América del Sur, involucrando la región de Santa María, presentarán, en principio, fluctuaciones magnéticas con similitud en los registros.
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