Stellar coronae are sites where the temperature is roughly of the same order as in the Sun's core. Could some sort of nucleosynthetic processes take place in the stellar coronae region?
I know that the material is extremely rare, and I don't expect possible reactions in the corona to contribute by any means to the solar's system abundance pattern, but could some sort of density-independent, araeonuclear reactions take place?
Plasma in corona is frozen in the magnetic field and gyrates around it. Ions gyrate in the opposite direction than electrons and with different orbital radius, therefore collisions between the two are rare. In impulsive events such as flares, there is acceleration of non-thermal electrons which are accelerated towards the chromosphere following the magnetic field and interact with the chromospheric material, thermalizing the region there (thick-target model) and causing chromospheric evaporation, therefore no nucleosynthesis either.
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Although the temperature conditions are met, sadly nucleosynthesis cannot be created in a stellar coronae because there is simply not enough pressure. Pressure is they key ingredient missing in this case.
Please check out http://iopscience.iop.org/article/10.1086/505112/fulltext/ . Nuclear reactions in the corona are observed during large flares. The reactions tend to involve heavier nuclei and are not the same as the p-p and CNO reaction chains that fuel the Sun and other stars.
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