Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh11a1504b&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH11A-1504
Astronomy and Astrophysics
Astrophysics
[2104] Interplanetary Physics / Cosmic Rays, [2134] Interplanetary Physics / Interplanetary Magnetic Fields, [2162] Interplanetary Physics / Solar Cycle Variations, [7536] Solar Physics, Astrophysics, And Astronomy / Solar Activity Cycle
Scientific paper
We have reconstructed the interplanetary magnetic field (IMF), its radial component, and the open solar magnetic flux using the solar modulation potential derived from cosmogenic 10Be radionuclide data for the past 9300 years. Reconstructions using the assumption of both constant and variable solar wind speeds yielded closely similar results. During the Maunder Minimum, the 40-year average strength of the IMF was approximately 2nT compared to a mean value of 6.6nT for the past 40 years, corresponding to an increase of the open solar magnetic flux of about 350%. The open flux did not vanish during the Maunder minimum confirming earlier results that the Sun was magnetically active although only few sunspots were observed. We examine four cycles of the Hallstatt periodicity in the IMF with a mean period of 2200 years. Grand solar minima have largely occurred in clusters during the Hallstatt cycle minima around the years -5300, -3400, -1100, and +1500 AD. The last cluster includes the Dalton, Maunder, and Spörer Minima. We predict that the next such cluster will occur in about 1500 years. During the past 9300 years the 40-year average IMF has varied between 2nT and 8nT, and does not confirm a proposed floor (lower limit). Furthermore, our reconstruction shows a 10,000-year periodicity with amplitude of 1.5nT that may be of solar origin or due to unknown changes in the atmospheric (system) effects or the geomagnetic field intensity.
Abreu Jose
Beer Joseph
McCracken K. G.
Steinhilber Friedhelm
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