On the existence of the 11-year cycle in solar activity before the Maunder minimum

Journal Article · Tue Nov 01 00:00:00 EST 1988 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JA093iA11p12729· OSTI ID:6743934

Attolini, M R; Cecchini, S; Cini Castagnoli, G; Galli, M; Nanni, T

The existence of the 11-year cycle in solar activity before the Maunder minimum is clearly demonstrated with cosmogenic /sup 10/Be in polar ice during 1180--1500 A.D. For that interval a periodicity of 11.4 +- 0.2 years is found with a high significance level. Indication of a cyclicity that resembles the Hale magnetic cycle is also observed at a lower significance level. A highly variable cyclicity in the band 9.5--11.5 years is also found in the record of historical aurorae which appears to be well correlated with the /sup 10/Be cyclicity for the same time interval. It is concluded that the Schwabe, or 11-year, cycle and the Hale magnetic cycle were present before and after the Maunder minimum, even though it is not possible to understand the variability of the cycle. copyright American Geophysical Union 1988

• Research Organization: Istituto Tecnologie Studio Radiazioni Extraterrestri, Consiglio Nationale delle Ricerche, Bologna, Italy
• OSTI ID: 6743934
• Journal Information: J. Geophys. Res.; (United States), Vol. 93:A11
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BERYLLIUM 10
GEOCHEMISTRY
POLAR REGIONS
SOLAR CYCLE
VERIFICATION
CARBON 14
CORRELATIONS
DATA ANALYSIS
GREENLAND
ICE
ISOTOPE RATIO
NATURAL OCCURRENCE
SUNSPOTS
ALKALINE EARTH ISOTOPES
BERYLLIUM ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CARBON ISOTOPES
CHEMISTRY
EVEN-EVEN NUCLEI
ISOTOPES
LIGHT NUCLEI
NUCLEI
RADIOISOTOPES
SOLAR ACTIVITY
STARSPOTS
STELLAR ACTIVITY
YEARS LIVING RADIOISOTOPES
640104* - Astrophysics & Cosmology- Solar Phenomena