Distribution of upflowing ionospheric ions in the high-altitude polar cap and auroral ionosphere

Physics

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Auroral Zones, Ion Motion, Ionospheric Ion Density, Polar Caps, Vertical Motion, Hydrogen Ions, Latitude, Oxygen Ions, Positive Ions, Vertical Distribution

Scientific paper

The frequency of occurrence and characteristics of upflowing ions (UFI) in the polar cap and auroral ionosphere are examined statistically using data from the Atmospheric Dynamics Explorer I. A total of 43,000 measurements of the UFI were made from 1981-83, and covered both masses and energies of the ions. The data indicated that many UFI observed at high altitudes originated as low altitude conical or perpendicular ions. The peak source of the ions was below 23,000 km and was latitude and time dependent. The frequency of O+ conics decreased with altitude relative to the H+ conics. The O+ and H+ conics distributions both, however, displayed dawn-dusk asymmetries that favored the dusk sector.

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