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solar activity

The collective term for all active phenomena on the Sun, including sunspots, faculae, active regions, plages, active prominences, and flares. Solar activity is strongly associated with ...

solar activity

solar activity   Quick reference

A Dictionary of Weather (2 ed.)

Reference type:
Subject Reference
Current Version:
2008

... activity The general term for all forms of active phenomena on the Sun, including solar flares and sunspots . All solar activity is linked with the Sun's magnetic fields and with increases and decreases in the solar cycle...

solar activity

solar activity   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

... activity The collective term for all active phenomena on the Sun, including sunspots , faculae , active regions , plages , active prominences , and flares . Solar activity is strongly associated with magnetic fields, which are thought to arise from a dynamo action within the Sun. Solar activity increases and decreases in a cycle lasting approximately 11 years ( see sunspot cycle...

solar activity

solar activity   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

Reference type:
Subject Reference
Current Version:
2017

... activity Activity of the Sun...

solar activity and sunspots

solar activity and sunspots   Reference library

The Oxford Companion to the Earth

Reference type:
Subject Reference
Current Version:
2003

...cycle, spots appear in both hemisphere at about 35° from the solar equator. As the cycle proceeds, the initial spots fade and new, more numerous spots occur at lower latitudes. By the end of any given cycle the sunspots are concentrated at latitudes around 5° from the solar equator. Sunspots are typically measured using the Wolf Relative Sunspot Number. This is a measure of the number of groups of spots combined with the number of individual spots, calculated on a monthly basis. Sun-spot activity varies from zero, as was observed during the Maunder Sunspot...

solar activity

solar activity  

The collective term for all active phenomena on the Sun, including sunspots, faculae, active regions, plages, active prominences, and flares. Solar activity is strongly associated with magnetic ...
Folklore, Customs, and Civic Ritual

Folklore, Customs, and Civic Ritual   Quick reference

Charles Phythian-Adams

The Oxford Companion to Local and Family History (2 ed.)

Reference type:
Subject Reference
Current Version:
2009
Subject:
History, Local and Family History
Length:
6,037 words
Publisher:
Oxford University Press

... Michael Jones (2000) ; Ronald Hutton , The Stations of the Sun: A History of the Ritual Year in Britain (1996). All that may safely be claimed about the origins of calendrical patterns in Britain is that they were structured broadly according to earlier perceptions of the solar year. These seem to have reflected regionally variable divisions of the seasons (whether for geographical or cultural reasons it is not clear) by symbolically marking the beginning and end of summer with observances which were probably concerned with first‐fruits and harvest. In...

solar architecture

solar architecture  

The design and building of structures that are energy efficient in terms of solar energy, involving a combination of technologies including solar panels and photovoltaic systems.
solar luminosity

solar luminosity  

A measure of the brightness of the Sun, which is determined by the amount of solar radiation it is emitting.
Solar Dynamics Observatory

Solar Dynamics Observatory  

A NASA satellite, launched in 2010 February, to improve understanding of solar activity and its effects on Earth. The Helioseismic and Magnetic Imager (HMI) measures solar oscillations and the ...
solar–terrestrial relations

solar–terrestrial relations  

The effects of solar activity on the Earth and its magnetic field. The largest effects originate from magnetic disturbances which travel out from the Sun and produce geomagnetic storms as they ...
Solar Variability and Climate

Solar Variability and Climate  

Variations in solar activity have been observed in numbers of sunspots since ancient times, but the extent to which solar variability may affect global climate has been controversial. Solar radiation ...
solar cycle

solar cycle  

A variation of activity on the Sun over an 11-year period indicated primarily by the number of sunspots visible on its surface. The next period of maximum activity is expected round 2011.
solar minimum

solar minimum  

The period of time when sunspots and other activity are least frequent, although not usually absent.
solar maximum

solar maximum  

The period of time around the peak of the sunspot cycle when sunspots and other activity are most frequent.
Solar Terrestrial Relations Observatory

Solar Terrestrial Relations Observatory  

A pair of NASA spacecraft launched in 2006 October to study coronal mass ejections (CMEs) and the solar wind. One of the pair, STEREO A (Ahead), is in an orbit slightly smaller than that of the Earth ...
solar thermal electric technology

solar thermal electric technology  

A range of technologies that are similar in concept to solar heating technologies in using sunlight to generate heat, but they create enough heat to power a generator, which is then used to produce ...
solar dynamo

solar dynamo  

The action within the Sun whereby the kinetic energy of the hot, highly ionized gas of the solar interior is converted into the magnetic field that gives rise to solar activity. In the picture due to ...
Solar Max

Solar Max  

A satellite launched by NASA in 1980 to study solar activity. It discovered that the Sun's luminosity increases slightly when sunspots are most numerous. It was repaired in orbit by astronauts from ...
Rudolf Wolf

Rudolf Wolf  

(1816–93)Swissastronomer. Following the discovery of the solar cycle by S. H. Schwabe, Wolf set about collecting all available data on sunspot numbers. He established the dates of all sunspot maxima ...
solar constant

solar constant  

The rate per unit area at which solar radiation reaches the outer margin of the earth's atmosphere. This fixes the energy supply for the atmospheric heat engine. Gribben (1991) New Scientist 132, ...

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