TITLE:
A Simulation Study of the Effect of Geomagnetic Activity on the Global Circulation in the Earth’s Middle Atmosphere
AUTHORS:
Igor Mingalev, Galina Mingaleva, Victor Mingalev
KEYWORDS:
Middle Atmosphere; Global Circulation; Numerical Simulation
JOURNAL NAME:
Atmospheric and Climate Sciences,
Vol.3 No.3A,
July
22,
2013
ABSTRACT: To investigate how geomagnetic activity
affects the formation of the
large-scale global circulation
of the middle atmosphere, the non-hydrostatic model of the global
wind system of the Earth’s atmosphere, developed earlier in the Polar Geophysical Institute, is
utilized. The model produces three-dimensional global distributions of the
zonal, meridional, and vertical components of the wind velocity and neutral gas
density in the troposphere, stratosphere, mesosphere, and lower thermosphere.
Simulations are performed for the winter period in the northern hemisphere (16
January) and for two distinct values of geomagnetic activity (Kp = 1 and Kp = 4). The
simulation results indicate that geomagnetic activity ought to influence considerably on the
formation of global wind system in the stratosphere,
mesosphere, and lower thermosphere.
The influence on the middle atmosphere
is conditioned by the vertical transport of air from the lower thermosphere to
the mesosphere and stratosphere and vice versa. This transport may be rather
distinct under different geomagnetic activity conditions.