We discuss a solar dynamo model of Tayler–Spruit type whose Ω Ω-effect is conventionally
produced by a solar-like differential rotation but whose α α-effect is assumed to be …

The Schwabe frequency band of the Zurich sunspot record since 1749 is found to be made
of three major cycles with periods of about 9.98, 10.9 and 11.86 years. The side frequencies …

Numerous empirical evidences suggest that planetary tides may influence solar activity. In
particular, it has been shown that:(1) the well-known 11-year Schwabe sunspot number …

Herein we show that the historical records of mid-latitude auroras from 1700 to 1966 present
oscillations with periods of about 9, 10–11, 20–21, 30 and 60 years. The same frequencies …

We compare the performance of a recently proposed empirical climate model based on
astronomical harmonics against all CMIP3 available general circulation climate models …

The solar cycle appears to be remarkably synchronized with the gravitational torques
exerted by the tidally dominant planets Venus, Earth and Jupiter. Recently, a possible …

Total solar irradiance (TSI) is the primary quantity of energy that is provided to the Earth. The
properties of the TSI variability are critical for understanding the cause of the irradiation …

The heliophysics catalogues published by the Ebro Observatory during 1910–1937 have
been converted into a digital format in order to provide the data for computational …

We highlight the existence of an intriguing and to date unreported relationship between the
surface area of the South Atlantic Anomaly (SAA) of the geomagnetic field and the current …

Based on analysis of the annual averaged relative sunspot number (ASN) during 1700–
2009, 3 kinds of solar cycles are confirmed: the well-known 11-yr cycle (Schwabe cycle) …