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Individual sunspots or groups of sunspots may last anywhere from a few days to a few months, but eventually decay. Sunspots expand and contract as they move across the surface of the Sun, with diameters ranging from 16 km (10 mi) [3] to 160,000 km (100,000 mi). [4] Larger sunspots can be visible from Earth without the aid of a telescope. [5]
Sunspots by themselves don’t pose any health risks. Rarely, though, a sunspot can change into melanoma. A sunspot larger than 1–2 centimeters would be more likely to become melanoma. “The ...
For a sunspot to be visible to the human eye it must be about 50,000 km in diameter, covering 2,000,000,000 square kilometres (770,000,000 sq mi) or 700 millionths of the visible area. Over recent cycles, approximately 100 sunspots or compact sunspot groups are visible from Earth.
Benign summer light eruption is a cutaneous condition, and a name used in continental Europe, particularly France, to describe a clinically short-lived, itchy, papular eruption particularly affecting young women after several hours of sunbathing at the beginning of summer or on sunny vacations.
Human-induced forcings are needed to reproduce the late-20th century warming. [25] Some studies associate solar cycle-driven irradiation increases with part of twentieth century warming. [26] [27] Three mechanisms are proposed by which solar activity affects climate: Solar irradiance changes directly affecting the climate ("radiative forcing ...
Sunspot AR3664 visible on the bottom right part of the Earth-facing side of the sun on May 9, 2024. (NASA/ Solar Dynamics Observatory) Millions of people who went out of their way to find eclipse ...
A "severe" solar storm could make the northern lights visible in the U.S. farther south than usual while also posing the potential to disrupt modern technology, according to the National Oceanic ...
A simple scheme of sunspot classification based on the McIntosh system for sunspot groups, or related to a region's fractal complexity [62] is commonly used as a starting point for flare prediction. [63] Predictions are usually stated in terms of probabilities for occurrence of flares above M- or X-class within 24 or 48 hours.