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Discussion papers | Copyright
https://doi.org/10.5194/angeo-2018-55
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 11 Jun 2018

Regular paper | 11 Jun 2018

Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Annales Geophysicae (ANGEO) and is expected to appear here in due course.

Sporadic Aurora near Geomagnetic Equator: In the Philippines, on 27 October 1856

Hisashi Hayakawa1,2, José M. Vaquero3, and Yusuke Ebihara4,5 Hisashi Hayakawa et al.
  • 1Graduate School of Letters, Osaka University, Toyonaka, 5600043, Japan
  • 2JSPS Research Fellow, Tokyo, 1020083, Japan
  • 3Departamento de Física, Universidad de Extremadura, E-06800 Mérida, Spain
  • 4Research Institute for Sustainable Humanosphere, Kyoto University, Uji, 6100011, Japan
  • 5Unit of Synergetic Studies for Space, Kyoto University, Kyoto, 6068306, Japan

Abstract. 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 latitudes 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 aurorae except for its considerably low magnetic latitude. The record also suggests that extremely low-latitude aurora is not always accompanied with 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.

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Hisashi Hayakawa et al.
Hisashi Hayakawa et al.
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Short summary
We provide a case report of the low latitude aurora near geomagnetic equator on 27 October 1856. This aurora occurred during a moderate geomagnetic disturbance and is considered sporadic aurora which appears in relatively low magnetic latitude in a limited geographical extent. The report shows a limited duration of this phenomenon and we considered the physical nature of sporadic aurora accordingly.
We provide a case report of the low latitude aurora near geomagnetic equator on 27 October 1856....
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