Heavy Ion Effects on Geomagnetic Field Line Resonance Calculations

Details Heavy Ion Effects on Geomagnetic Field Line Resonance Calculations Heavy Ion Effects on Geomagnetic Field Line Resonance Calculations

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm53a1659b&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM53A-1659

Statistics

Computation

2753 Numerical Modeling, 2772 Plasma Waves And Instabilities (2471), 2784 Solar Wind/Magnetosphere Interactions, 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

Field-aligned eigenmodes can be excited by mode conversion of compressional waves propagating across magnetospheric field lines. At low frequencies, the mode conversion occurs at the Alfven resonance, but mode conversion may also occur for higher frequencies at the ion-ion hybrid resonance when multiple ions are present. The mode-converted waves propagate along the magnetic field and set up a field-aligned eigenmode between the ionospheres. We examine the spectrum of field-aligned eigenmodes and their eigenfrequencies using numerical and analytical techniques based on an extension of the low frequency Alfvenic field-line resonance theory. For the computations, we use an a axisymmetric dipole magnetic field along with an accurate model for electron number density data between 3 and 9 Earth radii L shells. The eigenvalue problem is solved using a shooting code combined with an analytic continuation into the complex plane around the singularities at ion cyclotron resonances. We examine the dependence of the eigenmodes, which can be global or spatially localized along the field line, on the concentration of heavy ions. Some modes are also damped because of wave absorption at the cyclotron frequency. We discuss implications of the solutions for observed Pc1 pulsations and discuss the localization of eigenmodes in the equatorial magnetosphere.

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