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 ?
During times of solar activity, many sunspots can be observed on the Sun.
Joten Okamoto (NAOJ Fellow) and Takashi Sakurai (Professor Emeritus of NAOJ) were analyzing data taken by the Solar Optical Telescope onboard HINODE, when they noticed the signature of strongly magnetized iron atoms in a sunspot. Surprisingly the data indicated a magnetic field strength of 6,250 gauss.
Caption: Figure 6: Wavelet coherence spectrum of monthly sunspots and monthly global temperatures.
As shown in Figures 5 and 6, the time series of sunspots are decomposed into 6 IMFs by VMD, and 6 IMFs and 1 residual component are obtained by EMD decomposition.
Using 31 years of observations, they found that the structure of the Sun's surface layer, where sunspots form, changed markedly in 1994.
In this paper, the sunspot number smoothing monthly mean time series is derived from the sunspot index data center of the Royal Observatory Belgium (http://sidc.oma.be/silso/ datafiles).
This suggests, perhaps, that the SSA during 1917 and 1918 (associated with SCI5) possibly is due to a smaller percentage of large area sunspots (individual sunspots having SSA > 1,000), while SSA during 1959 (SC19) and 1982 (SC21) possibly is due to a larger percentage of large area sunspots.
Sunspots was a natural progression from Neptune Blue, which also has an astronomical basis, and is a series of poems that give the Sun a voice.
Sunspots can be the size of Earth or as big as Jupiter.
The data (smoothed monthly mean sunspots, SMMS) were downloaded from ftp://ftp.ngdc.noaa.gov/, that is the web side of the National Geophysical Data Center.
The group continued to develop and was type Eac on Aug 14 with the leading and middle penumbral sunspots being the largest.