Solar-terrestrial relationships deal with the influence of the Sun and solar activity on our terrestrial environment. The driving force is the input of energy and matter into geospace. From the viewpoint of space plasma physics, the most important (and also the scientifically soundest) consequences have been discussed in Chap. 8. But there are also side-effects to these phenomena, such as the influence of solar energetic and auroral particles on the chemistry of the atmosphere, or the uproar caused in our technical environment due to severe geomagnetic disturbances. Other connections exist, too, relating solar cycle variations to weather and climate. These latter bear the seed for controversial discussions; nonetheless, some of the ideas will be reported here.
KeywordsSolar Activity Solar Cycle Energetic Particle Geomagnetic Storm Solar Energetic Particle
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