Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh52a07p&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH52A-07
Physics
2704 Auroral Phenomena (2407), 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms
Scientific paper
Visual auroral observations provide perhaps the longest time series of geomagnetic activity; the oldest observations come from 1000 years ago. We show that the solar irradiance values deduced from C14 observations and auroral occurrence show considerable correlation over the past 1000 years, which indicates that the visual observations made at different locations do provide a quite reliable record of the level of auroral activity. In addition to the traditionally used sunspot number giving the level of solar activity, the model by Solanki et al. (2000) gives the open solar magnetic flux as computed from the sunspot data. These records extend to about 1700. We show results of comparisons of the solar magnetic flux with the variations of geomagnetic aa-index series (1844-2000) and auroral occurrence rate (1700-1980). Their characteristic secular variations as well as the 11-year solar periodicity follow closely the flux model variations. It is shown that during the solar cycle, the flux model implies a systematic delay (2.0 yr) in the flux maximum in respect to the sunspot maximum, which is similar to that detected in the aa-index and auroral occurrence variations.
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