5:15 PM - 6:30 PM
[PEM16-P19] Effect of intrinsic magnetic field decrease on the low-to-middle latitude ionosphere-thermosphere dynamics simulated by GAIA
Keywords:thermosphere-ionosphere, low-to-middle latitude, intrinsic magnetic field dependence
The model simulation is operated with a reduced (50% and 75%) intrinsic magnetic field referring to February 2008 when the wave-4 structure is appeared and solar activity was quiet. In order to focus on the low-to-middle latitude profiles, this experiment excludes the cross-polar cap potential and auroral electron input.
The calculated parameters averaged over the 250 km shows small variations in the neutral wind velocity and electron density with magnetic field changes, while the dynamo electric field decreases and the ionospheric horizontal current increases with increasing magnetic field. In addition to the proportional dependence of the dynamo field on the magnetic field, the ionospheric conductance dependence with ~B-2~-1 due to an upward shift of the conductance shift affects the horizontal current. The decreased magnetic field provides the zonal wind enhancement and upward shift of electron peak altitude in the equatorial region. We will report the cause of these variations and their effects on the wave propagation.