Physics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987angeo...5..161l&link_type=abstract
Annales Geophysicae, Series A - Upper Atmosphere and Space Sciences (ISSN 0980-8752), vol. 5, June 1987, p. 161-167.
Physics
13
Auroras, Magnetic Disturbances, Magnetospheric Instability, Secular Variations, Solar Terrestrial Interactions, Geomagnetic Latitude, Magnetoactivity, Solar Cycles, Sunspots
Scientific paper
The method to use for establishing a reliable and the longest possible series of annual frequencies of auroral occurrence is discussed. First, from the history of auroral naked eye observation, the lack of homogeneity of the data is analyzed. Then an upper limit of the latitude of the aurora reports is adopted. The necessity of compiling separate series of aurora reports in order to obtain a frequency of auroral occurrence closely linked to the level of magnetospheric activity is proven. Finally, it is shown that during the period with no geomagnetic activity indices the sunspot numbers can be used to check the homogeneity of a series of aurora reports. In conclusion, it is shown that the aurora series can be used to confirm, during two centures, Ohl's (1976) relationship between the magnetospheric activity occurring during the last 4 years of a cycle and the following sunspot peak.
Legrand Jean-Pierre
Simon P. A.
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