HR: 16:00h
AN: SA24A-01    [Abstracts]
TI: Ionospheric Longitude Storm Dependence Upon the Magnitude of the Earth's Magnetic Field
AU: * Sojka, J J
EM: sojka@cc.usu.edu
AF: Utah State University, Center for Atmospheric and Space Sciences 4405 Old Main Hill, Logan, UT 84322-4405, United States
AU: David, M
EM: michael.david@aggiemail.usu.edu
AF: Utah State University, Center for Atmospheric and Space Sciences 4405 Old Main Hill, Logan, UT 84322-4405, United States
AU: Schunk, R W
EM: schunk@cc.usu.edu
AF: Utah State University, Center for Atmospheric and Space Sciences 4405 Old Main Hill, Logan, UT 84322-4405, United States
AB: The Earth's magnetic field in the ionosphere is understood to be non-dipolar with significant deviations in magnitude and orientation across the globe. This study models the mid-latitude ionospheric response to a geomagnetic storm for different idealizations of the Earth's magnetic field strength. In so doing the study addresses the question whether or not a longitude dependence in ionospheric storm responses could exist due to the longitude dependence of the magnetic field [ Huang et al., 2005], and if so, how significant is the effect? The mechanism by which the magnetic field magnitude has a first order effect is through the E x B plasma drift that has a vertical components, i.e., usually described as a meridional plasma drift caused by the zonal electric field. This vertical drift is inversely proportional to the magnitude of the magnetic field. A vertical drift raises or lowers the F-region into regions of lesser or greater recombination rates respectively, hence, directly affecting the plasma density. The Utah State University (USU) Time Dependent Ionospheric Model (TDIM) uses a tilted dipole magnetic field model to represent the Earth's field. The magnitude of magnetic field is specified by the dipole moment, in fact, the magnetic field strength on the surface of the Earth at the magnetic equator. Changing this one parameter enables studies to be made under identical storm conditions of the effect of different magnetic field magnitudes. For this study the normal 0.31 Gauss surface magnetic field is replaced by 0.24 Gauss and 0.41 Gauss. These two numbers represent the magnitude of the minimum and maximum observed field strength around the Earth equatorial region. The TDIM results are shown for a storm simulation that occurred on 5-6 November 2001. For otherwise identical model conditions and drivers, the difference in magnetic field strength results in a factor of 2 difference in TEC, N_mF₂, etc. Since the magnetic field magnitude is weakest in the Atlantic (South Atlantic specifically) and largest over the central Asian continent, these simulations predict that the Atlantic storm densities would be many 10's of percent larger than those in Asia for identical electric fields. The simulated mechanism will contribute to a longitude dependence that produces larger ionospheric densities over the Atlantic sector provided an eastward electric field is present. This is very likely to be the case during major geomagnetic storms as the high-latitude convection pattern extends to mid- and low-latitudes. Huang, C.-S., J. C. Foster, L. P. Goncharenko, P. J. Erickson, W. Rideout, and A. J. Coster, (2005), A strong positive phase of ionospheric storms observed by the Millstone Hill incoherent scatter radar and global GPS network, J. Geophys. Res., 110, A06303, doi:10.1029/2004JA010865.
DE: 2400 IONOSPHERE (6929)
DE: 2443 Midlatitude ionosphere
DE: 2447 Modeling and forecasting
SC: SPA-Aeronomy [SA]
MN: 2007 Fall Meeting