Conclusion
We have presented a model for the sprite green ghost based on the
emissions being the auroral green line at 557.7 nm and an assumed
lightning associated electric field decaying exponentially. The model
can fit the observations of a two green ghosts made 24 and 25 May 2020
from Lamy, NM, lending support to the suggestion that the emissions are
indeed from atomic oxygen. The observation that the green ghost has
maximum intensity well after the main sprite has turned off combined
with the observed green emission decay time constant being significantly
larger than time constants calculated based on formulas and rate
constants given by Vallance Jones (1974) indicate the presence of
processes lasting well after the main sprite has turned off.