Event Title

Anomalous Resistivity in Magnetosphere-Ionosphere Current Systems: The Role of Ion Cyclotron Turbulence

Location

Yosemite National Park

Start Date

2-8-1974 9:15 AM

End Date

2-8-1974 9:45 AM

Description

Field aligned currents flowing between the auroral zone topside ionosphere and the magnetosphere excite the electrostatic ion cyclotron instability when the electron drift velocity exceeds-1/31 VTe (H+ mode). Typically, this condition is satisfied at altitudes >1000km. We have made numerical estimates of anomalous resistivity due to ion cyclotron turbulence as a function of altitude in such current systems. In order to arrive at these estimates we have assessed the role played by electron-ion collisions, spatial effects such as convection of wate energy, and various competing nonlinear saturation mechanisms (Quasi-linear plateau formation, ion resonance broadening, nonlinear ion Landau damping, etc.) in the ionosphere-magnetosphere environment.

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Feb 8th, 9:15 AM Feb 8th, 9:45 AM

Anomalous Resistivity in Magnetosphere-Ionosphere Current Systems: The Role of Ion Cyclotron Turbulence

Yosemite National Park

Field aligned currents flowing between the auroral zone topside ionosphere and the magnetosphere excite the electrostatic ion cyclotron instability when the electron drift velocity exceeds-1/31 VTe (H+ mode). Typically, this condition is satisfied at altitudes >1000km. We have made numerical estimates of anomalous resistivity due to ion cyclotron turbulence as a function of altitude in such current systems. In order to arrive at these estimates we have assessed the role played by electron-ion collisions, spatial effects such as convection of wate energy, and various competing nonlinear saturation mechanisms (Quasi-linear plateau formation, ion resonance broadening, nonlinear ion Landau damping, etc.) in the ionosphere-magnetosphere environment.