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Parameter Tree: EARTH SCIENCE > SUN-EARTH INTERACTIONS > SOLAR ACTIVITY Definition: Any change in the sun's appearance or behavior. The sun's activity is described as being very low, low, moderate, high or very high. Solar activity changes over a period of, on average, 11 years. At solar maximum, the solar activity is high and so too the Extreme Ultraviolet (EUV) radiation output which affects the ionosphere. At solar minimum, the opposite is true. Reference: Reference: An Extended Glossary of Solar-Terrestrial Terms from the IPS Radio and Space Services: http://www.ips.oz.au/background/richard/glossary.html |
