  Using the quantum Markovian master equation, we show that convection in the
stellar photosphere generates plasma waves by an irreversible process akin to
Zeldovich superradiance and sonic booms. In the Sun, this mechanism is most
efficient in quiet regions with small magnetic fields. Energy is mostly carried
by megahertz Alfven waves that scatter elastically until they reach a height at
which they can dissipate via mode conversion. This gives the right power flux
for coronal heating and may account for chromospheric evaporation leading to
impulsive heat transport in the corona.
