Glossary term: Fotosfera
Description: A fotosfera (“esfera de luz”) é a camada de uma estrela da qual emerge a luz que observamos. A luz emitida por camadas mais profundas e densas será absorvida antes de poder escapar da estrela. As camadas superiores são menos densas e não emitem luz significativa.
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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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In Other Languages
- Árabe: الغلاف الضوئي
- Alemão: Photosphäre
- Inglês: Photosphere
- Francês: Photosphère
- Italiano: Fotosfera
- Japonês: 光球 (external link)
- Coreano: 광구
- Chinês Simplificado: 光球
- Chinês Tradicional: 光球
Related Media
Imagem em alta resolução da superfície do Sol
Caption: Esta imagem em alta resolução de uma pequena porção da “superfície” visível mais externa do Sol (a fotosfera) abrange uma área de 36.500 por 36.500 km. Foi uma das primeiras imagens captadas pelo Telescópio Solar Daniel K. Inouye, durante a Fase de Verificação Científica do telescópio. Cada uma das células visíveis tem aproximadamente o tamanho do estado americano do Texas, da França, do Afeganistão ou da Somália. Nos centros mais brilhantes dessas células, o plasma proveniente das regiões subjacentes sobe à superfície, esfria e, em seguida, afunda novamente no local das faixas mais escuras que delimitam as células. Nessas faixas escuras, também podemos observar os pequenos e brilhantes pontos que marcam a presença dos campos magnéticos.
Credit: NSO/NSF/AURA
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License: CC-BY-4.0 Creative Commons Attribution 4.0 International (CC BY 4.0) icons
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
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License: CC-BY-4.0 Creative Commons Attribution 4.0 International (CC BY 4.0) icons
