sunspot


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Related to sunspot: Sunspot cycle

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 ?
Okamoto explains, "HINODE's continuous high-resolution data allowed us to analyze the sunspots in detail to investigate the distribution and time evolution of the strong magnetic field and also the surrounding environment.
Caption: HOW SUNSPOT NUMBERS CHANGE WITH TIME Scientists use monthly averages of the International Sunspot Number (shown), itself a statistical combination of many observations, to track the solar cycle.
Sunspot Cycle Characteristics based on the Newly Revised Sunspot Number, Journal of the Alabama Academy of Science 86, Numbers 3-4, July/October, pp.
AR1836 N12[degrees]/343[degrees] appeared over the NE limb as a single Hsx sunspot on Aug 27.
Beyond metallic hydrogen itself, dense hydrogen could play an important role in the Sun, since the photosphere appears to be less metallic in nature than sunspots [5].
Scientists can't predict sunspots with any certainty, but there is one solar event in 2012 that's truly your last chance in a lifetime.
Matt Penn of the National Solar Observatory, another study co-author, said sunspot magnetic fields have been steadily decreasing in strength since 1998.
The fact that they match up is a powerful indicator that the sunspot cycle may be going into hibernation.
I am not in any way an expert on this subject but I know a bit about sunspots.
They say it's no coincidence that an increase in sunspot activity and a run-up of global temperatures on Earth are happening concurrently, and view regulation of carbon emissions as folly with negative ramifications for our economy and tried-and-true energy infrastructure.
In fact, we were hard pressed to measure much of a temperature rise in the SUNSpot after two minutes of operation.
Unusually heavy periods of rainfall in eastern Africa over the past century have occurred approximately one year ahead of peak periods of sunspot activity, notes paleoclimatologist Curt Stager of Paul Smith's College.