Intercomparison of Cold Ion Density Measurements in the Plasmasphere-Magnetosphere

Details Intercomparison of Cold Ion Density Measurements in the Plasmasphere-Magnetosphere Intercomparison of Cold Ion Density Measurements in the Plasmasphere-Magnetosphere

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm51d..01f&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM51D-01

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2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2768 Plasmasphere, 2772 Plasma Waves And Instabilities (2471)

Scientific paper

Recent studies have shown that the radial plasma density profile in the plasmasphere-plasmapause region may vary considerably depending on the particle species measured and the particular satellite instrument making the measurement. For example the heavy ion relative concentrations of He+ and O+ compared with H+ ions, are not constant with increasing radial distance. Also, some satellites measure electron density, directly or indirectly, while others measure H+ and He+. IMAGE-EUV satellite results have confirmed the existence of plasma plumes in the middle magnetosphere. This paper will consider intercalibration between instruments measuring plasma density in the plasmasphere/magnetosphere and develop diagnostic techniques to compute heavy ion densities in plasma plumes. Using the spectral properties of electromagnetic ion cyclotron (EMIC) waves seen in plasma plumes in conjunction with ion density data and diagnostic techniques it is possible to almost completely describe the plasmasphere and magnetosphere cold/cool plasma composition. Particle data from the LANL geostationary satellites, EUV images from the IMAGE satellite and EMIC wave data from the GOES satellites are used in this study. Results yield ion densities ranging from over H+ = 20 - 100 cm-3 and He+ = 3 - 13 cm-3. The He+ results are compared with computed pseudo-densities of He+ determined from IMAGE-EUV data.

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