Physics
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24..583i&link_type=abstract
Geophysical Research Letters, Volume 24, Issue 5, p. 583-586
Physics
44
Ionosphere: Ionospheric Disturbances, Ionosphere: Wave Propagation, Meteorology And Atmospheric Dynamics: Atmospheric Electricity
Scientific paper
Data acquired by a new array of horizontally spaced photometers boresighted with a low-light-level camera provide the first measurement of the rapid lateral expansion of optical luminosity in lightning-induced ionospheric flashes referred to as `elves', occurring over time scales substantially less than 1 ms. The narrow individual fields-of-view of (2.2°×1.1°) provide a spatial resolution of ~20-km at a range of 500 km, enabling the documentation of expansion occurring over a horizontal range of 200 km with a time resolution of ~30μs. The observed dynamic features of elves are consistent with a model in which the optical output is produced as a result of heating by the electromagnetic pulse (EMP) from a lightning discharge.
Barrington-Leigh C.
Bell Timothy F.
Glukhov Vyacheslav Sergeevich
Hansen Steve
Inan Umran S.
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