Solar cycle variation of some mass dependent characteristics of upflowing beams of terrestrial ions

Details Solar cycle variation of some mass dependent characteristics of upflowing beams of terrestrial ions Solar cycle variation of some mass dependent characteristics of upflowing beams of terrestrial ions

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.4757c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, May 1, 1987, p. 4757-4762. Research supported by the Lockheed Indepen

Physics

45

Auroral Zones, Hydrogen Ions, Ion Beams, Magnetospheric Ion Density, Oxygen Ions, Solar Cycles, Energy Spectra, Extreme Ultraviolet Radiation, Solar Radiation

Scientific paper

Examination of the S3-3 and DE ion composition data spread over a solar cycle indicates that some characteristics of energetic upflowing terrestrial ion beams above the auroral zone show dependence on solar cycle. At solar maximum the different ion beam mass components have comparable mean energies, and O(+) dominates the beam composition. The ion energies are consistent with having been acquired from the potential drop below the satellite inferred from the electron loss cone distributions. At solar minimum the beam composition is dominated by H(+), but the O(+) has a higher mean energy and is hotter than the H(+) component. Also, the O(+) has more energy than it could itself have acquired from the potential drop. These observations are qualitatively consistent with the ion beams having acquired their energies from a parallel electric field and being partially thermalized through the two-stream instability between the two ion species, with this effect being modulated by the beam composition.

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