Articles | Volume 36, issue 4
https://doi.org/10.5194/angeo-36-1153-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-36-1153-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Regular paper
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29 Aug 2018
Regular paper | Highlight paper |
| 29 Aug 2018
| 29 Aug 2018
Sporadic auroras near the geomagnetic equator: in the Philippines, on 27 October 1856
Hisashi Hayakawa
CORRESPONDING AUTHOR
Graduate School of Letters, Osaka University, Toyonaka, 5600043, Japan
Science and Technology Facilities Council, RAL Space, Rutherford
Appleton Laboratory, Harwell Campus, Didcot, OX11 0QX, UK
Japan Society for the Promotion of Science, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo 102-0083, Japan
José M. Vaquero
Departamento de Física, Universidad de Extremadura, 06800
Mérida, Spain
Yusuke Ebihara
Research Institute for Sustainable Humanosphere, Kyoto University,
Uji, 6100011, Japan
Unit of Synergetic Studies for Space, Kyoto University, Kyoto,
6068306, Japan
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Terrestrial exospheric dayside H-density profile at 3–15 RE from UVIS/HDAC and TWINS Lyman-α data combined
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Ground-based observations show a phase shift in semi-annual variation of excited hydroxyl emissions at mid-latitudes compared to those at low latitudes. This differs from the annual cycle at high latitudes. We found that this shift in the semi-annual cycle is determined mainly by the superposition of annual variations of T and O concentration. The winter peak for emission is determined exclusively by atomic oxygen concentration, whereas the summer peak is the superposition of all impacts.
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Short summary
A record has been found of an "aurora" observed on 27 October 1856 in the Philippines, practically at the magnetic equator. An analysis of this report indicates that it could belong to a "sporadic aurora" because of low magnetic activity at that time. We provide a possible physical mechanism that could explain the appearance of this sporadic, low-latitude aurora, according to the analyses on the observational report and magnetic observations at that time.
A record has been found of an "aurora" observed on 27 October 1856 in the Philippines,...
