Sunspot AR3190 is covering around 25 millionths of the solar disk, while the Earth would cover 169 millionths of the sun's surface.
of the sun's surface where the magnetic field holds a higher level of energy as a result of their magnetic field lines being twisted. Historically, sunspots have been occasionally visible from Earth without a telescope, with one such giant sunspot drawn by observers in East Asia in 1769.
"The minimal visibility threshold is estimated as [roughly] 425 millionths of the visible solar disk—0.04 percent of the solar disk)—whereas larger sunspot area and favorable meteorological conditions improve their visibility," Hisashi Hayakawa, a solar physicist at Nagoya University in Japan, toldSunspot AR3190, circled in red, is so large that it is visible with the naked eye from Earth.
"I would recommend you to use eclipse glasses," Hayakawa said."Don't directly see the sun, even through smoked glass. Your eyes will be burnt. Some historical astronomers significantly reduced their eyesight owing to their solar observations," he added, citing Galileo and Thaddäus Derfflinger.
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