Frequency/Spatial Scale Alfven Wave Component Comparison Between Simultaneous Polar and FAST Observations and Simulations and Evidence for Low Latitude Alfvenic Accelerated Electrons During Major Storms

Details Frequency/Spatial Scale Alfven Wave Component Comparison Between Simultaneous Polar and FAST Observations and Simulations and Evidence for Low Latitude Alfvenic Accelerated Electrons During Major Storms Frequency/Spatial Scale Alfven Wave Component Comparison Between Simultaneous Polar and FAST Observations and Simulations and Evidence for Low Latitude Alfvenic Accelerated Electrons During Major Storms

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm11a0292d&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM11A-0292

Other

2704 Auroral Phenomena (2407), 2736 Magnetosphere/Ionosphere Interactions (2431), 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2788 Magnetic Storms And Substorms (7954), 7845 Particle Acceleration

Scientific paper

Alfven waves play a variety of roles in the propagation of energy between the magnetosphere and the ionosphere, from the establishment and maintenance of field-aligned currents to more direct effects such as auroral electron acceleration and ion outflow. These latter effects in what is commonly now called Alfvenic acceleration region and the cusp have been the topic of much recent research. We present the results of two studies: one examining low latitude acceleration and the other involving detailed analysis of various frequency components and perpendicular spatial scales of Alfven waves simultaneously observed on similar magnetic field lines at Polar (~7 Re geocentric) and FAST (~3900 km altitude) in the Alfvenic acceleration region at ~23 MLT. We will present data and simulation comparisons of the change in the various frequency/spatial scale content between the two spacecraft, and the reflection, dissipation and ionospheric coupling and transition of the components between Polar, FAST and the ionosphere. We will discuss the impact of these results on the understanding of the process of high altitude sheer Alfven wave Poynting flux conversion into auroral electron acceleration. The relationship between various components of the Alfven waves that couple through Pederson currents in the ionosphere, those that reflect, and those that accelerate electrons will also be discussed. We will also present Alfven waves events observed by FAST at low latitudes, down to 58 degrees, during major geomagnetic storms in association with broadband downgoing auroral electrons with properties similar to those commonly observed in the Alfvenic acceleration region.

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