sunspot

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sunspot

Dermatology
(1) Actinic keratosis, see there.
(2) Actinic lentigo, see there.
 
Meteorology
A region of intense magnetic activity on the sun’s surface resulting in a local reduction in convection and temperature, which appears are dark spots.
References in periodicals archive ?
2007 was also the year of lowest starspot activity so far recorded.
Bernhard & Frank (4,6) state that the starspot activity on the larger star is the chief cause of the variations in the depth of the secondary minima.
Scatter around the secondary minimum caused by starspot activity is a known feature of RS CVn binaries.
In addition we modelled two starspots to enhance the curve fit.
In some stars, starspots can be very large and occupy a substantial fraction of the surface area of the star.
This led Chris Lloyd to suggest that at least one of the stars in the binary is an active RS CVn variable with one or more large starspots on its surface.
When you have a method like this for determining starspots, what do you do with it?
2 [nm] line, and found that superflare stars have large starspots compared to sunspots.
The results of these observations and analysis confirm that stars similar to the Sun can have superflares if they have large starspots.
About three years ago astronomers figured out how to draw pictures of starspots (SN: 7/17/82, p.
The way to determine the prevalence of starspots is to follow changes in the star's brightness from time to time.
Likewise, astronomers want to associate starspots with stellar magnetic behavior.