Scientists still aren’t sure. There are theories that it has to do with the sun’s magnetic lines.
Well, the core actually is hotter than the outer layers, but the outer layers are indeed hotter than the middle layer. The sun is categorized into seven layers, from the inside to the outside they are: the core, the radiative zones, the convective zone, the photosphere, the chromosphere, and the corona. The core is 15 millions degrees K, the photosphere is 5800K, the chromosphere is about 10,000K, and the corona, the outermost layer, is 1 million degrees K. Not everything about the sun is understood, but it is theorized that the reason for the chromosphere being hotter than the photosphere are because of Ohmic heating. When the magnetic fields of the outer layers of the sun can get tangled, and when they reconnect the force is explosive, creating heat in a process called Ohmic heating. Solar flares are a result of this process.
The coronal layers are thought to be extremely hot in a process similar to cracking a whip. Amounts of energy at the base of the corona travel outward. As it does so, the density is reduced but the energy conserved, propelling the energy faster and faster, increasing the temperature. Just as the end of a whip, when cracked, moves much faster than the base that began the movement in the first place.
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