Sporadic auroras near the geomagnetic equator: in the Philippines, on 27 October 1856

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Sporadic auroras near the geomagnetic equator: in the Philippines, on 27 October 1856

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Title: Sporadic auroras near the geomagnetic equator: in the Philippines, on 27 October 1856
Author: Hayakawa, Hisashi; Vaquero Martínez, José Manuel; Ebihara, Yusube
Abstract: Mientras que las pantallas aurorales de baja latitud se consideran normalmente una manifestación de tormentas magnéticas de un tamaño considerable, Silverman (2003, JGR, 108, A4) informó numerosas "auroras esporádicas" que aparecen localmente a una latitud magnética relativamente baja durante tiempos de actividad magnética moderada. Aquí, se presenta un estudio de caso de una aurora cerca del ecuador geomagnético basado en un informe de las islas Filipinas el 27 de octubre de 1856. Un análisis de este informe muestra que es consistente con los casos conocidos de auroras esporádicas, excepto por su aparición en considerablemente baja latitud magnética. El registro también sugiere que una aurora de latitud extremadamente baja no siempre va acompañada de grandes tormentas magnéticas. La descripción de su breve aparición conduce a una posible explicación física basada en una perturbación efímera magnetosférica que provoca esta aurora esporádica.While low-latitude auroral displays are normally considered to be a manifestation of magnetic storms of considerable size, Silverman (2003, JGR, 108, A4) reported numerous “sporadic auroras” which appear locally at relatively low magnetic latitude during times of just moderate magnetic activity. Here, a case study is presented of an aurora near the geomagnetic equator based on a report from the Philippine islands on 27 October 1856. An analysis of this report shows it to be consistent with the known cases of sporadic auroras, except for its appearance at considerably low magnetic latitude. The record also suggests that an extremely low-latitude aurora is not always accompanied by large magnetic storms. The description of its brief appearance leads to a possible physical explanation based on an ephemeral magnetospheric disturbance provoking this sporadic aurora.
URI: http://hdl.handle.net/10662/9872
Date: 2018


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