NO(+) enhancement in the auroral F-region during ion frictional heating events, found in EISCAT-CP1-data

Details NO(+) enhancement in the auroral F-region during ion frictional heating events, found in EISCAT-CP1-data NO(+) enhancement in the auroral F-region during ion frictional heating events, found in EISCAT-CP1-data

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jatp...55.1417g&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 55, no. 10, p. 1417-1432.

Physics

2

Atmospheric Chemistry, Eiscat Radar System (Europe), F Region, Ionospheric Ion Density, Molecular Ions, Nitric Oxide, Ionospheric Heating, Oxygen Ions, Radar Data

Scientific paper

Experimental evidence is given for an increase of the molecular ion content in the height range 180-300 km during several 'ion frictional heating events': height profiles of the ion temperature, found in EISCAT-CP1 data, show minima of several 100 K between 210 and 260 km, as compared to the lower and upper F-region. These minima are shown to be mainly due to an enhancement of the NO(+) concentration, which is interpreted as a low ion temperature by the standard EISCAT fit. Following this assumption, the O(+) molecular ion ratio is calculated from the difference between measured and theoretical height profiles of the ion temperature parallel to the magnetic field. Further, the O(+), NO(+), and O2 content is calculated from the chemical reaction equations, considering the temperature dependence of the reaction rates. As a common result of the difference methods of calculation, the NO(+) content below 300 km increases considerably during the analyzed ion heating events. At 200 km, the O(+) content decreases from 50 percent by 5-20 percent and the transition zone from molecular ion to O(+) dominance can rise from 200 up to 260 km.

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