Dear Colleagues,

This Special Issue aims to explore Sun–Earth–Climate relationships and natural causes using observational data and computational analysis. These climatic, solar, and natural-cause variabilities range over a time scale from the recent past (1000 years) to the present. Among the most used observational data, there are sunspots, geomagnetic, ionospheric, meteorological, climatic, and hydrological data. On the other hand, one can learn about the past of solar and climate variabilities by reading terrestrial archives that provide us with “proxy” data on the history of the Sun and climate. Bearing in mind that different natural mechanisms can affect the climate of a given place, in addition to anthropogenic effects, it is necessary to study the influence of solar activity, El Niño events, and other geophysical phenomena in order to understand climate variability. The study of solar activity, the structures of the interplanetary way, and their effects on the magnetosphere and ionosphere are also important to understand the physical dynamic processes that occur during magnetic storms, substorms, and auroras. Scientists of the Natural Records Laboratory (Laboratório de Registros Naturais - LRN) from the University of Vale do Paraíba (Universidade do Vale do Paraíba) are dedicated to expanding tree ring use and its application, as well as other observational records, to improve our understanding of past climate and environmental history，especially in Brazil and South America. Our current research focuses on the use of tree ring data networks to study regional climate, global climate teleconnections, Sun–Earth–Climate interrelationships, and anthropogenic impacts.

Dr. Virginia Klausner de Oliveira
Prof. Dr. Alan Prestes
Guest Editors

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• tree rings
• climate
• solar activity
• Sun–Earth relationship
• geomagnetism