FAST Spacecraft Observation of Ion Cyclotron Waves in the Auroral Zone

Details FAST Spacecraft Observation of Ion Cyclotron Waves in the Auroral Zone FAST Spacecraft Observation of Ion Cyclotron Waves in the Auroral Zone

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm13a1655c&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM13A-1655

Physics

2704 Auroral Phenomena (2407), 2712 Electric Fields (2411), 2716 Energetic Particles: Precipitating, 2721 Field-Aligned Currents And Current Systems (2409), 2772 Plasma Waves And Instabilities (2471)

Scientific paper

Ion cyclotron waves have been observed in many regions of the Earth's magnetosphere and by many spacecraft. Observations from the FAST spacecraft during auroral zone crossings have frequently shown ion cyclotron waves in conjunction with upward going ion beams, as well as solitary waves. The types of ion cyclotron waves available depend strongly on the heavy ion concentrations. Since radiation from the Sun ionizes most of the plasma in the ionosphere, the state of the ionosphere is dependent on the solar cycle. Furthermore, due to the fact that the upwelling from the ionosphere is the source of heavy ions such as oxygen in the Earth's magnetosphere, the ion composition of the magnetosphere changes dramatically during the solar cycle, with the number densities of heavier ions being much higher during the periods of maximum solar activity. We will present preliminary results from a study of FAST spacecraft observations of ion cyclotron waves including electric and magnetic field, and ion data along with comparisons to numerical dispersion relations. In this study we plan to correlate the ion cyclotron wave to the heavy ion concentration that is observed, as well as looking for correlation with the solar cycle.

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