N2 and M2 lunar tides: atmospheric resonance revisited
Other literature type
Schlapp, D. M.
Stening, R. J.
Forbes, J. M.
Manson, A. H.
Meek, C. E.
Vincent, R. A.
A numerical model has been used to calculate
the atmospheric response to forcing at periods in the region of 12-13.5 h. The
results show that the response is enhanced in the neighbourhood of 13 h. These
results have been compared with lunar tidal analyses of mesospheric wind data
and geomagnetic variations at a number of stations. It is found that the N<sub>2</sub>
lunar tidal component (period 12.66 h) is significantly enhanced relative to the
main lunar tidal component M<sub>2</sub> (period 12.42 h) in both types of data,
compared with what would be expected from the gravitational tidal potential.
This supports the predictions of the numerical model. An appreciable phase shift
is also found in the experimental data between the N<sub>2</sub> and M<sub>2</sub>
tides, agreeing in sense with what would be expected for a resonance at a period
around 13 h.