  Observational studies indicate that there is a close association between
geomagnetic storm and meteorological parameters. Geomagnetic field lines follow
closely the isobars of surface pressure . A Physical mechanism linking upper
atmospheric geomagnetic storm disturbances with tropospheric weather has been
proposed by the author and her group where it is postulated that vertical
mixing by turbulent eddy fluctuations results in the net transport upward of
positive charges originating from lower levels accompanied simultaneously by
downward flow of negative charges from higher levels. The present study reports
enhancement of high frequency (<15 days period) fluctuations in daily surface
pressure during March 1989 in association with major geomagnetic storm (Ap
index = 246) on 13 march 1989.
