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.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
References in periodicals archive ?
2007 was also the year of lowest starspot activity so far recorded.
It is still unclear what impact the presence of starspots on Proxima Centauri has on the habitability of Proxima b.
--Chromospherically active stars with starspots appear to vary as they rotate;
When you have a method like this for determining starspots, what do you do with it?
The existence of a strong magnetic field was itself inferred from the presence of these starspots.
Such variations are explained by the rotation of the star and its starspots. The stars seem to become dimmer when their starspots are on their visible sides.
Consequently, we can predict how planetary systems like our solar system will be affected by the evolution of their central stars." To measure a star's spin, astronomers look for changes in its brightness caused by dark spots known as starspots crossing the star's surface.
In order to further improve the fit on the lightcurve shoulders it was necessary to introduce two starspots on the secondary and the combined effect can be seen in Figure 5 when compared with Figure 4.
Observing as many stars as they can, and continuing to do so, they started to see rotation periods from the periodic brightening and dimming of the stars, as starspots come in and go out of view.
So could Tabby's star be exhibiting an extreme case of starspots? Probably not.
As a star's spinning slows, so does the generation of starspots and solar storms associated with starspots.
According to Michael Shao of NASA's Jet Propulsion Laboratory in Pasadena, Calif., both astrometry and spectroscopy have the same nemesis: starspots. These blemishes, akin to sunspots, tend to have a lower temperature than surrounding regions.