Model estimates of optical emissions due to lightning-induced electron precipitation

Model calculations are conducted to estimate the optical emission brightness caused by lightning-induced electron precipitation (LEP). Pitch-angle scattering of energetic radiation-belt electrons by whistler-mode waves results in precipitation in the upper atmosphere. We calculate the secondary ionization production and optical emissions in a number of lines and bands. We find that the N₂ 1P and O(¹S) emissions may reach ~10 R for a 100 kA peak current, with distinct spatial and temporal signatures. A simple SNR calculation shows that the emissions should be detectable with modern photometric instruments. We further investigate the dependence of these emissions on lightning source latitude.