NDLI: Long-term Spatial and Temporal Variations of Aurora Borealis Events in the Period 1700

Content Provider	Springer Nature Link
Author	Vázquez, M. Vaquero, J. M. Gallego, M. C.
Copyright Year	2013
Abstract	Catalogues and other records of aurora-borealis events were used to study the long-term spatial and temporal variation of these phenomena in the period from 1700 to 1905 in the Northern Hemisphere. For this purpose, geographic and geomagnetic coordinates were assigned to approximately 27 000 auroral events with more than 80 000 observations. They were analyzed separately in three large-scale areas: i) Europe and North Africa, ii) North America, and iii) Asia. There was a clear need to fill some gaps existing in the records so as to have a reliable proxy of solar activity, especially during the 18th century. In order to enhance the long-term variability, an 11-year smoothing window was applied to the data. Variations in the cumulative numbers of auroral events with latitude (in both geographic and geomagnetic coordinates) were used to discriminate between the two main solar sources: coronal mass ejections and high-speed streams from coronal holes. The characteristics of the associated auroras correlate differently with the solar-activity cycle.
Starting Page	1843
Ending Page	1861
Page Count	19
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	289
Issue Number	5
e-ISSN	1573093X
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-11-06
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Solar activity Geomagnetic storm Aurora borealis Astrophysics and Astroparticles Atmospheric Sciences Extraterrestrial Physics, Space Sciences
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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