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Olsen 1982
Olsen, R.C. (1982). Field-aligned ion streams in the earth’s midnight region. Journal of Geophysical Research 87. doi: 10.1029/JA087iA04p02301. issn: 0148-0227.

Plasma measurements from the University of California at San Diego auroral particles experiment on the geosynchronous Applied Technology Satellite 6 in the midnight region show that the low-energy ion fluxes (1--100 eV) are field aligned and are well characterized as thermal populations (1--10 eV) with a streaming velocity of 30--100 km/s along the magnetic field line. The lowest energies are found prior to injections, on quiet days, with an increase of the streaming velocity evident when an injection occurs near the satellite. Multiple peaks in the ion distribution functions are attributed to the presence of different ion species (H+, He+, O+, O++) streaming at similar velocities, both during quiet times and as the plasma velocity increases to an injection.

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Journal of Geophysical Research
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American Geophysical Union
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