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Glossary term: 태양흑점

Also known as 흑점

Description: 태양흑점은 태양 표면(광구)에 나타나는 일시적이고 온도가 낮은 영역으로, 강한 자기장 때문에 생깁니다. 태양흑점은 태양 내부 깊은 곳에서 올라온 자기 플럭스관이 나오는 자리입니다. 강한 자기장은 이 부분의 자기 압력을 높입니다. 그런데 주변과 압력이 균형을 이루기 위해 흑점 안쪽의 가스와 플라즈마 압력이 낮아져야 하고, 그 결과 태양흑점은 주변보다 온도가 더 낮아집니다. 태양흑점은 주변보다 온도가 낮기 때문에 망원경으로 볼 때 태양 표면에서 어두운 반점이나 얼룩처럼 보입니다. 흑점의 크기는 수십 km에서 수십만 km까지 다양하며, 며칠에서 길게는 몇 달 동안 지속될 수 있습니다. 태양에서 흑점의 수와 위치는 태양 주기에 따라 달라집니다. 그리고 태양 말고도, 다른 별들에서도 자기장 때문에 생기는 흑점이 있을 것으로 생각됩니다.

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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher
The translation of this term and its definition is still awaiting approval

The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".

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Credit: NASA/SDO/HMI credit link

License: PD Public Domain icons


A dark, roughly circular, black sunspot sends dark fingers out into the bright orange surroundings

Close-up view of a sunspot

Caption: This image of a sunspot was taken by the Daniel K Inouye Solar Telescope (DKIST), operated by the U.S. National Science Foundation. It was taken only in light with a wavelength of 530 nanometers, within the greenish-yellow part of the visible spectrum. The picture reveals the detail of the spot's structure and the Sun’s photosphere. The dark central region, known as the umbra, is surrounded by a lighter area called the penumbra with radially elongated features stretching towards the umbra. Note that the umbra and penumbra here are not the same as the umbra and penumbra that occur during an eclipse. The sunspot measures approximately 5000 kilometres in diameter, roughly equivalent to the east-west span of China. While the umbra appears black, it is actually hot and bright. It only appears dark because it is a few thousand kelvin cooler than the surrounding solar photosphere. Surrounding the sunspot, granulation patterns of plasma are visible on the photospheric surface of the Sun.
Credit: NSO/NSF/AURA credit link

License: CC-BY-4.0 Creative Commons 저작자표시 4.0 국제 (CC BY 4.0) icons

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