Now you might think that temperatures here must be the lowest here since we are the farthest away from the heat-generating core… but that isn't the case. The sun's corona extends thousands of miles above the visible "surface" (photosphere) of the sun.
Above the chromosphere lies the corona - the outermost layer of the sun's atmosphere. Now here is where things get a little bit strange. The chromosphere lies above the photosphere and temperatures range from approximately 11,000 degrees F (6,000 degrees C) nearest the photosphere to about 7,200 degrees F (4,000 degrees C) a couple of hundred miles higher up. Parker Solar Probe: Mission to touch the sun The sun's atmosphere: Photosphere, chromosphere and corona temperatures Plasma in this layer moves in a convective motion - like boiling water - bubbles of hot plasma transport heat to the surface of the sun. Temperatures in the convection zone are approximately 4 million degrees F (2 million degrees C). Convection zone temperaturesīeyond the radiative zone is the sun's convective zone which extends for 120,000 miles (200,000 kilometers) according to. It can take light particles (photons) thousands of years to meander their way through this layer before reaching the surface of the sun. Instead, heat is transferred via thermal radiation whereby hydrogen and helium emit photons that travel a short distance prior to getting reabsorbed by other ions. No thermal convection occurs in this layer, according to the science news website (opens in new tab). Outside the sun's core lies the radiative zone where temperatures range from 12 million degrees F (7 million degrees C) nearest the core to around 4 million degrees F (2 million degrees C) in the outer radiative zone, according to the educational website (opens in new tab). The energy then radiates outward to the sun's surface, atmosphere and beyond. The continual nuclear fusion, causes energy to build up and the sun's core reaches temperatures of about 27 million degrees F (15 million degrees C).
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