Discovery of energetic molecular ions (NO/+/ and O 2/+/) in the storm time ring current

Details Discovery of energetic molecular ions (NO/+/ and O 2/+/) in the storm time ring current Discovery of energetic molecular ions (NO/+/ and O 2/+/) in the storm time ring current

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..632k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, July 1986, p. 632-635.

Physics

25

Energetic Particles, Magnetic Storms, Molecular Ions, Positive Ions, Ring Currents, Nitric Oxide, Oxygen, Plasma Dynamics, Space Plasmas, Time Of Flight Spectrometers

Scientific paper

A few hours after the onset of a large geomagnetic storm on September 4, 1984, energetic molecular ions in the mass range 28-32, predominantly NO(+) and O2(+), have been discovered in the outer ring current at L of about 7. The data have been obtained with the time-of-flight spectrometer SULEICA on the AMPTE/IRM spacecraft. At 160 keV/e, a mean abundance ratio of the molecular ions relative to O(+) ions of 0.031 + or - 0.004 is found. During quiet times no molecular ions are observed, the 1 sigma upper limit of the ratio derived by averaging over several quiet periods is 0.003. The observations demonstrate the injection of ionospheric plasma into the storm time ring current and the subsequent acceleration to energies of several hundred keV on a time scale of a few hours after the onset of the magnetic storm.

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