Sunspots
Related Category: Astronomy: General
dark, usually irregularly shaped spots on the sun's surface that are actually solar magnetic storms. The Chinese recorded dark features on the sun seen with the naked eye in 28 B.C.
Sunspot Cycle
A daily count of the number of sunspots visible on the Sun (the Wolf number or Zurich sunspot number) shows a periodic variation with maxima occuring (on average) every 11 years.
Sunspots
The sunspot group seen on 22 Sept 2000, the largest for 9 years, covered about 1/500th of the solar surface, ...
Sunspot
For other meanings of "sunspot" see sunspot (disambiguation).
sunspots n.
1. Notional cause of an odd error. "Why did the program suddenly turn the screen blue?" "Sunspots, I guess." 2.
sunspots
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Sunspot
From Wikipedia, the free encyclopedia
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Sunspots:
Sunspots are a vortex of gas on the surface of the Sun associated with strong local magnetic activity. Spots look dark only by contrast with the surrounding photosphere, which is several thousand degrees hotter.
Sunspots are a feature of the that have been observed since ancient times (including by ). When viewed through a telescope, sunspots have a dark central region known as the umbra, surrounded by a somewhat lighter region called the penumbra.
The sunspot cycle was discovered by S. Heinrich Schwabe in 1843 (he started his observations in 1826).
WARNING: do NOT look at the sun; it can damage your eyes permanently! ...
Just as our Sun has sunspots, new research shows that so too does Betelgeuse, although on a much larger scale - these two giant spots have diameters on the order of the size equivalent of the Earth-to-Sun distance, some 150,000,000 kilometres.
Sunspot
Wikipedia, the free encyclopedia - Cite This Source
A sunspot is a region on the Sun's surface (photosphere) that is marked by a lower temperature than its surroundings and has intense magnetic activity, which inhibits convection, ...
A Sunspot
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When Sunspots Collide
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A powerful solar flare (the bright area in the bottom half of this image) erupted when two sunspots collided in December.
Sun and Sunspots Index Page Learn More about Our Sun and Sunspots and Their Effects on Earth
Read more Space Today Online stories about the Solar System
Star: ...
Sunspots and the Rise and Fall of Civilizations Maurice Cottrell
There appears to be a correlation between the rise and fall of civilizations with the rise and fall of radiation from the sun.
Sunspots are appropriately named. They appear as spots on the disk of the Sun. A sunspot will have a very dark central region known as the umbra. It is often surrounded by a less dark halo known as the penumbra.
Increased sunspot activity frequently accompanies an increase in the outflow of from the sun in the form of a "solar wind".
Sunspots
Sunspots appear as dark spots on the surface of the Sun. Temperatures in the dark centers of sunspots drop to about 3700 K (compared to 5700 K for the surrounding photosphere).
SUNSPOTS
A wonderful rhythm in the ebb and flow of sunspot activity dominates the atmosphere of the Sun and influences life on Earth as well.
SUNSPOTS
Figure 16.15 is an optical photograph of the entire Sun, showing numerous dark blemishes on the surface.
Sunspots
Around 1610, soon after the telescope first became available, three independent observers--Galileo, Galilei, Johann Fabricius and Christopher Scheiner--used it to observe dark spots on the face of the Sun.
Sunspots These are seen as dark spots in the photosphere that have extremely high magnetic fields. They usually show up in groups of two sets and have a lower temperature than their surroundings. This gives them a darkened appearance.
Sunspots.
The American astronomer George E. Hale discovered in 1908 that sunspots contain strong magnetic fields. A typical sunspot has a magnetic-field strength of 2500 gauss.
Sunspots
Along with contemporaries such as Thomas Harriot, David Frabicius and Christoph Scheiner, Galileo observed dark regions that appeared to move across the surface of the Sun.
Sunspots and Other Solar Activities
Prominences (as shown in the photo below) are eruptions of the gas trapped in the magnetic fields in the chromosphere. Usually, they are about a few times the size of the Earth.
sunspot cycle
a cycle averaging 11 years in which the number of sunspots increases and decreases
supercluster ...
sunspot -- a magnetic disturbance on the Sun that appears as a dark blotch on its surface.
synodic month -- the time from one full Moon to the next (about 29.5 days).
Sunspot. An area seen as a dark spot on the photosphere of the Sun. Sunspots are concentrations of magnetic flux, typically occurring in bipolar (i.e. two-part with positive and negative poles like a magnet) clusters or groups.
Sunspot- a highly magnetized dark spot on the sun's surface, cooler than surrounding area ...
sunspot
A dark blemish on the surface of the sun which is cooler than the surrounding regions. Although not fully understood, sunspots are known to be connected to the solar magnetic field.
sunspots
Cooler (and thus darker) regions on the sun where the magnetic field loops up out of the solar surface.
SXG
The Spectrum X-Gamma mission ...
Sunspot
a temporary disturbed area in the solar photosphere that appears dark because it is cooler than the surrounding areas. Sunspots consist of concentrations of strong magnetic flux.
sunspot: Relatively dark spot on the sun that contains intense magnetic fields.
supercluster: A cluster of galaxy clusters.
supergiant: Exceptionally luminous star 10 to 1000 times the sun's diameter.
Sunspot Group - A cluster of sunspots
Supergiant - An extremely luminous star of large size and mass
Supergranulation - The pattern of very large (15,000 to 30,000 km in diameter) convective cells in the Sun's photosphere ...
Sunspot
(a) Comparatively dark spot on the Sun's photosphere, commonly one of a (not always obvious) group of two.
Sunspots and related acne
Various phenomena observed on the Sun can extend through all of the layers of the atmosphere, though it may be more apparent in some layers more so than others.
Making Sunspots
Figure 1. Example of work bench
1. Tell students they will recreate the magnetic structures of sunspots using magnets and iron filings. They will visualize a simple, bipolar magnetic field.
Sunspots are regions of strong magnetic fields. This affects the spectral lines in the sunspot spectra. Each absorption lines will split up into multiple components.
sunspots and faculae in the photosphere
plages, fibrils, and filaments in the chromosphere
coronal condensations in the corona.
Solar flares are also associated with active regions.
Sunspots Temporary magnetic disturbances in the photosphere. They appear dark because temperatures are considerably lower than in surrounding areas.
More about sunspots...
Sunspot
A region on the Sun's photosphere that is cooler and darker than the surrounding material. Sunspots often appear in pairs or groups with specific magnetic polarities that indicate electromagnetic origins.
Sunspot Cycle ...
Sunspot
Dark, cool spots which form on the surface of the Sun.
Supernova ...
Sunspot group 9393
Christmas 2000 partial eclipse sequence of images
Christmas 2000 partial eclipse time lapse video (422KB requires media player)
Moon
Images with 8 inch f/10 LX200 ...
sunspots
Dark patches on the Sun, 1500°C cooler than its average surface temperature. Cause is unknown
supernova ...
sunspot - (n.)
A relatively dark area of the solar surface. Sunspots appear dark because they are relatively cool; they represent regions of extremely high magnetic field.
sunspot cycle - (n.) ...
Sunspot
A sunspot is a region on the Sun's surface that is marked by intense magnetism activity, which inhibits convection, forming areas of reduced surface temperature....
Sunspot
Areas of the Sun's surface that are cooler than surrounding areas. The usually appear black on visible light photographs of the Sun. Sunspots are usually associated disturbances in the Sun's electromagnetic field.
Sunspots are cool, dark patches on the surface. They are caused by disturbances in the sun's magnetic field which make the sunspot about 2700°F (1500°C) cooler than the surrounding area.
SUNSPOTS
Sunspots are cool, dark patches on the Sun's surface. They are caused by disturbances in the sun's magnetic field which make the sunspot about 2700°F (1500°C) cooler than the surrounding area.
A sunspot model in which the expanding current sheath scoops up material like a snowplow, but discards all the accumulated matter when the magnetic field reverses. [H76]
SNR ...
Are any sunspots on the sun today? Visit this site to find out! Watch videos to learn more about the sun and how it affects Earth.
Tonight's Sky: Highlights of the March Sky → ...
HOW SMALL A SUNSPOT CAN WE SEE ON THE SUN?
-Lew Thomas 4-28-01
First, we shall apply Dawes Limit which strictly applies to the resolution of two equally bright points of light. This is ...
Planet-sized sunspots are the
relatively cooler but surprisingly
shallow tops of swirling hurricanes
of electrified gas (more from NASA
and Astronomy Picture of the Day).
But what causes sunspots? It turns out that it has to due with the magnetic field of the Sun. The Sun rotates faster at the equator than it does at the poles This is known as differential rotation.
The amplitude of this variation changes with the phase of the moon, the seasons, and the sunspot cycle.
faculae (NASA Thesaurus / NASA SP-7, 1965) Large patches of bright material forming a veined network in the vicinity of sunspots. They appear to be more permanent than sunspots and are probably due to elevated clouds of luminous gas.
A localized, transient volume of the solar atmosphere in which PLAGEs, SUNSPOTS, FACULAe, FLAREs, etc. may be observed. ACTIVE SURGE REGION (ASR). An ACTIVE REGION that exhibits a group or series of spike-like surges that rise above the limb.
From studies of the apparent motions of sunspots across the solar disk, we see that the Sun rotates "differentially.
1613 - Galileo Galilei uses sunspot observations to demonstrate the rotation of the Sun
1619 - Johannes Kepler postulates a solar wind to explain the direction of comet tails
1802 - William Hyde Wollaston observes dark lines in the solar spectrum ...
 See also: Sun, Solar, Earth, Sunspots, Light
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