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What is Solar Coronal Mass Ejections

Chapter 1
Handbook of Research on Global Environmental Changes and Human Health
Large solar expulsions of plasma and magnetic field from the Sun’s corona. CMEs travel outward from the Sun at speeds ranging from 250 km/s to 3000 km/s. The fastest Earth-directed CMEs can reach our planet in as little as 15-18 hours. Slower CMEs can take several days to arrive. They expand in size as they propagate away from the Sun and larger CMEs can reach a size comprising nearly a quarter of the space between Earth and the Sun by the time it reaches our planet.
Published in Chapter:
Space Weather and Link to Climate Change
Hamid Nebdi (Chouaïb Doukkali University, Morocco)
Copyright: © 2019 |Pages: 20
DOI: 10.4018/978-1-5225-7775-1.ch001
Abstract
Our nearest shining star, the Sun, source of radiations and energy, sometimes generates severe events and phenomena in space which can affect our technology and biosphere. On the other hand, space weather, as defined by National Aeronautics and Space Administration (NASA), is conditions on the Sun and in the solar wind, magnetosphere, ionosphere, and thermosphere that can influence the performance and reliability of space-borne and ground-based technological systems and can endanger human life or health. A brief description of the Sun-Earth connection is firstly presented. Secondly, a particular attention is given to highlight the Sun's variability and the link between the space weather and climate change by means of some recent studies.
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