EXOS D (Akebono) observations of molecular NO(+) and N2(+) upflowing ions in the high-altitude auroral ionosphere

Details EXOS D (Akebono) observations of molecular NO(+) and N2(+) upflowing ions in the high-altitude auroral ionosphere EXOS D (Akebono) observations of molecular NO(+) and N2(+) upflowing ions in the high-altitude auroral ionosphere

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9811205y&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A7, p. 11,205-11,224.

Computer Science

Sound

24

Auroral Zones, Exos-D Satellite, Ionospheric Ion Density, Molecular Ions, Nitrogen Ions, Nitrogen Oxides, Ionospheric Sounding, Mass Spectrometers

Scientific paper

Observations of molecular upflowing ions in the high-altitude auroral ionosphere by the EXOS D (Akebono) suprathermal mass spectrometer (SMS) are reported. At Akebono altitude, the occurrence of molecular upflowing ions was rare and was often confined in latitudinal extent, in both the dayside and the nightside. The observed NO(+)/N2(+) ratio ranged from 0.3 to 1.3; the observed O2(+)/N2(+) ratio was 0.1 or less. Data from about 440 Akebono passes in the 7-mo period from November 1989 to May 1990 were surveyed for their occurrence. Molecular ions were found in 14 passes. In most but not all cases, the Kp index was 4 or higher at the time of their observation and in the preceding several hours, suggesting that they typically occur in periods of sustained auroral activity.

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