Congratulations! to Nicola Scafetta and Richard C Willson on the publication of their new paper: Planetary harmonics in the historical Hungarian aurora record (1523–1960). This is another excellent paper, published in Planetary and Space Science. Grabbitquick before I take it offline. Scafetta always makes papers available later if you miss this one. The Hungarian record goes back to a very early date and this makes the paper especially interesting to those of us eager to see more validation of the solar planetary theory, which is rapidly becoming the best show in town for matching paleo records. Geoff Sharp will be particularly pleased to see the strength of these Uranus-Neptune synodic correlations with solar activity levels.
The historical Hungarian auroral record extends from 1523 to 1960 and is longer than the sunspot record. Harmonic analysis reveals four major multidecadal secular cycles forming an approximate harmonic set at periods of 42.85, 57.13, 85.7 and 171.4 years. These four frequencies are very close to the four major heliospheric oscillations relative to the center of mass of the solar system caused by Jupiter, Saturn, Uranus and Neptune. Similar frequencies are found in solar radiation models based on long cosmogenic isotope records (Steinhilber et al., 2012) and in long records of naked-eye sunspot observations (Vaquero et al., 2002). Harmonic regression models are used to reconstruct and forecast aurora and solar activity for the period 1956–2050. The model predicts: (1) the multidecadal solar minimum in the 1970s that is also observed in the sunspot record; (2) a solar maximum in 2000–2002 that is observed in the ACRIM total solar irradiance satellite composite; (3) a prolonged solar minimum centered in the 2030s. These findings support a hypothesis that the Sun, the heliosphere and the terrestrial magnetosphere are partially modulated by planetary gravitational and magnetic forces synchronized to planetary oscillations, as also found in other recent publications (42, 43, 45, 46, 1 and 54).