Detalles de publicación
PP 013063
Long-term Spatial and Temporal Variations of Aurora Borealis Events in the Period 1700--1905
(1) Instituto de Astrofísica de Canarias, 38200 La Laguna, Spain.
(2) Departamento de Astrofísica, Universidad de La Laguna, 38205 La Laguna, Spain
(3) Departamento de Física, Universidad de Extremadura, Avda. Santa Teresa de Jornet 38, 06800, Mérida, Spain.
(4) Departamento de Física, Universidad de Extremadura, 06071 Badajoz, Spain.
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 analysed 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 aurorae
correlate differently with the solar-activity cycle.
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 analysed 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 aurorae
correlate differently with the solar-activity cycle.