The Daniel K Inouye Solar Telescope on Hawaii has released pictures that show features as small as 30km across.
This is remarkable when set against the scale of our star, which has a diameter of about 1.4 million km (870,000 miles) and is 149 million km from Earth.
The cell-like structures are roughly the size of the US state of Texas. They are convecting masses of hot, excited gas, or plasma.
The bright centres are where this solar material is rising; the surrounding dark lanes are where plasma is cooling and sinking.