Solar Cycle

The solar cycle (or solar magnetic activity cycle) is the periodic change in the sun's activity (including changes in the levels of solar radiation and ejection of solar material) and appearance (visible in changes in the number of sunspots, flares, and other visible manifestations). Solar cycles have a duration of about 11 years. They have been observed (by changes in the sun's appearance and by changes seen on Earth, such as auroras) for hundreds of years.

Solar variation causes changes in space weather and to some degree weather and climate on Earth. It causes a periodic change in the amount of irradiation from the Sun that is experienced on Earth.

It is one component of solar variation, the other being aperiodic fluctuations.

Powered by a hydromagnetic dynamo process, driven by the inductive action of internal solar flows, the solar cycle:

  • Structures the Sun's atmosphere, its corona and the wind;
  • Modulates the solar irradiance;
  • Modulates the flux of short-wavelength solar radiation, from ultraviolet to X-ray;
  • Modulates the occurrence frequency of solar flares, coronal mass ejections, and other geoeffective solar eruptive phenomena;
  • Indirectly modulates the flux of high-energy galactic cosmic rays entering the solar system.

Read more about Solar CycleHistory, Phenomena, Measurement, and Causes, Effects of The Solar Cycle

Other articles related to "cycle, solar cycle, solar, cycles, solar cycles":

Computus - Tabular Methods - Julian Calendar
... uncorrected repetition of the 19-year Metonic cycle in combination with the Julian calendar ... The sequence number of a year in the 19-year cycle is called its Golden Number ... The cycle of Sunday letters, however, does not repeat in seven years because of the interruptions of the leap day every four years, the full cycle in ...
Tim Patterson - Research - Climate Change
... predicting general climatic cooling as the sun enters Solar cycle 25 about 2018 ... He based his prediction on the close correlation between solar and climate cycles in his high resolution analysis of late Holocene cores deposited under anoxic conditions ... Solar cycle 25 will be as weak as solar cycles in the early 19th century during a very cold phase of the Little Ice Age ...
Solar Cycle (calendar)
... The solar cycle is a 28-year cycle of the Julian calendar with respect to the week ... This cycle also occurs in the Gregorian calendar, but it is interrupted by years such as 1700, 1800, 1900 and 2100, which are divisible by four but which are not leap years ... has the effect of skipping 16 years of the solar cycle between February 28 and March 1 ...
Zimmer Tower - Description of The Dials - The Solar Cycle and The Dominical Letter
... The solar cycle is a 28 year cycle ... On the inner circle, the hand indicates the current year of the solar cycle ...
Effects of The Solar Cycle - Effects On Spacecraft
... The coronal mass ejections ("CME") associated with solar flares produces a radiation flux of high-energy protons, sometimes known as solar cosmic rays ... cause radiation damage to electronics and solar cells in satellites ... The solar proton events also can cause single-event upset (SEU) events on electronics at the same, the reduced flux of galactic cosmic radiation during solar maximum (see ...

Famous quotes containing the words cycle and/or solar:

    Only mediocrities progress. An artist revolves in a cycle of masterpieces, the first of which is no less perfect than the last.
    Oscar Wilde (1854–1900)

    Our civilization has decided ... that determining the guilt or innocence of men is a thing too important to be trusted to trained men.... When it wants a library catalogued, or the solar system discovered, or any trifle of that kind, it uses up its specialists. But when it wishes anything done which is really serious, it collects twelve of the ordinary men standing round. The same thing was done, if I remember right, by the Founder of Christianity.
    Gilbert Keith Chesterton (1874–1936)