Title page for ETD etd-04232008-144243


Type of Document Master's Thesis
Author Wilder, Frederick Durand
Author's Email Address fwilder@vt.edu
URN etd-04232008-144243
Title Reverse Convection Potential Saturation in the Polar Ionosphere
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Clauer, C. Robert Committee Chair
Bailey, Scott M. Committee Member
Scales, Wayne A. Committee Member
Keywords
  • Ionosphere
  • Magnetosphere
  • Electromagnetics
  • HF Radar
  • Plasma Physics
Date of Defense 2008-04-17
Availability unrestricted
Abstract
The results of an investigation of the reverse convection potentials in the day side high latitude ionosphere during periods of steady northward interplanetary magnetic field (IMF) are reported. While it has been shown that the polar cap potential in the ionosphere exhibits non-linear saturation behavior when the IMF becomes increasingly southward, it has yet to be shown whether the high latitude reverse convection cells in response to increasingly northward IMF exhibit similar behavior. Solar wind data from the ACE satellite from 1998 to 2005 was used to search for events in the solar wind when the IMF is northward and the interplanetary electric field is stable for more than 40 minutes. Bin-averaged SuperDARN convection data was used with a spherical harmonic fit applied to calculate the average potential pattern for each northward IMF bin. Results show that the reverse convection cells do, in fact, exhibit non-linear saturation behavior. The saturation potential is approximately 20 kV and is achieved when the electric coupling function reaches between 18 and 30 kV/RE.
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