Polar Spacecraft Observations of Ion Cyclotron Waves

Details Polar Spacecraft Observations of Ion Cyclotron Waves Polar Spacecraft Observations of Ion Cyclotron Waves

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm43b..09c&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM43B-09

Other

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 are often seen near regions containing ion beams. Of the many types of waves present in the magnetosphere, ion cyclotron waves in the auroral acceleration region are of interest largely because of their ability to heat ions and their tendency to exist at the same time as other interesting phenomena such as solitary waves. The types of ion cyclotron waves available depends 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 dependant 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 Polar spacecraft observations of ion cyclotron waves including electric and magnetic field data, as well as ion data. 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. The Polar spacecraft makes a good platform for this study because its orbit cuts through many regions of the magnetosphere and data is available for almost an entire solar cycle.

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