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Feb 3, 2024 · Photosphere. Thickness/Size: Approximately 500 kilometers. Temperature: Around 5,500°C. Characteristics: The photosphere is the Sun’s visible surface, where light is emitted that we see from Earth. It’s marked by granules and sunspots, which are manifestations of the Sun’s magnetic activity.
The photosphere is about 300 km thick. Most of the Sun's visible light that we see originates from this region. The chromosphere is about 2000 km thick. We only see this layer and the other outer layers during an eclipse. The corona extends outwards for more than a solar radius.
The photosphere is a star's outer shell from which light is radiated. It extends into a star's surface until the plasma becomes opaque, equivalent to an optical depth of approximately 2 ⁄ 3, [1] or equivalently, a depth from which 50% of light will escape without being scattered.
Oct 10, 2012 · More detail on the outer layers follows: Photosphere – The photosphere is the deepest layer of the Sun that we can observe directly. It reaches from the surface visible at the center of the solar disk to about 250 miles (400 km) above that.
This dramatic sequence of images taken from the SOHO satellite over a period of 11 years shows how active regions change during the solar cycle. The images were taken in the ultraviolet region of the spectrum and show that active regions on the Sun increase and decrease during the cycle.
The photosphere is a thinner, cooler layer than its neighboring layers. It is only about 500 km (300 miles) wide, a much thinner layer than the interior solar regions. The temperature of the photosphere is around 5,500 °C (9,900 °F), which is much cooler than the Sun's core.
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On looking at the photosphere, we can see up to four different types of features. These are, in order of ease of observation: sunspots, faculae, granulation and super-granulation.
