A possible case of sporadic aurora observed at Rio de Janeiro
| dc.contributor.author | Oliveira, Denny M. | |
| dc.contributor.author | Hayakawa, Hisashi | |
| dc.contributor.author | Bhaskar, Ankush | |
| dc.contributor.author | Zesta, Eftyhia | |
| dc.contributor.author | Vichare, Geeta | |
| dc.date.accessioned | 2020-07-02T16:59:49Z | |
| dc.date.available | 2020-07-02T16:59:49Z | |
| dc.date.issued | 2020-06-06 | |
| dc.description.abstract | Being footprints of major magnetic storms and hence major solar eruptions, mid- to low-latitude aurorae have been one of the pathways to understand solar–terrestrial environments. However, it has been reported that aurorae are also occasionally observed at low latitudes under low or even quiet magnetic conditions. Such phenomena are known as “sporadic aurorae”. We report on a historical event observed by a scientist of the Brazilian Empire in Rio de Janeiro on 15 February 1875. We analyze this event on the basis of its spectroscopic observations, along with its visual structure and coloration, to suggest this event was a possible case of sporadic aurorae. Given the absence of worldwide aurora observations on that day as a consequence of low magnetic activity recorded on the days preceding the observation, in addition to a detailed description, the event observed can most likely be classified as a sporadic aurora. We discuss the geographic and magnetic conditions of that event. Thus, we add a possible case of sporadic aurora in the South American sector. | en_US |
| dc.description.sponsorship | The authors thank the National Library of Brazil (Biblioteca Nacional do Brasil) for providing and keeping a public newspaper archive (http://www.bn.br). The authors also acknowledge the British Geological Survey for providing the magnetic index data used in this investigation and Yusuke Ebihara for his helpful comments. Finally, we thank Martin Rehfeld for providing and making a FORTRAN code version of the GUFM1 model public at his web-service hosting GitHub website (https://github.com/martinrehfeld). DMO thanks the financial support of the NASA grants 13-SRITM132-0011 and HSR‐MAG142-0062, under contract with UMBC. HH acknowledges the JSPS Grand-in-Aid grant JP17J06954, JP15H05816, JP15H05812, and JP15K21709. AB acknowledges the support by the NASA Living With a Star Jack Eddy Postdoctoral Fellowship Program, administered by the Catholic University of America. | en_US |
| dc.description.uri | https://earth-planets-space.springeropen.com/articles/10.1186/s40623-020-01208-z | en_US |
| dc.format.extent | 9 pages | en_US |
| dc.genre | journal articles | en_US |
| dc.identifier | doi:10.13016/m2vmtl-rryo | |
| dc.identifier.citation | Oliveira, D.M., Hayakawa, H., Bhaskar, A. et al. A possible case of sporadic aurora observed at Rio de Janeiro. Earth Planets Space 72, 82 (2020). https://doi.org/10.1186/s40623-020-01208-z | en_US |
| dc.identifier.uri | https://doi.org/10.1186/s40623-020-01208-z | |
| dc.identifier.uri | http://hdl.handle.net/11603/19058 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Springer Open | en_US |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Goddard Planetary Heliophysics Institute (GPHI) | |
| dc.relation.ispartof | UMBC Faculty Collection | |
| dc.rights | This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author. | |
| dc.rights | Attribution 4.0 International | * |
| dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | * |
| dc.title | A possible case of sporadic aurora observed at Rio de Janeiro | en_US |
| dc.type | Text | en_US |