Variance of the vertical ion speed measured with the European Incoherent Scatter (EISCAT) UHF radar in the polar lower ionosphere at Tromsø, Norway

Details Variance of the vertical ion speed measured with the European Incoherent Scatter (EISCAT) UHF radar in the polar lower ionosphere at Tromsø, Norway Variance of the vertical ion speed measured with the European Incoherent Scatter (EISCAT) UHF radar in the polar lower ionosphere at Tromsø, Norway

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11600k06o&link_type=abstract

Journal of Geophysical Research, Volume 116, CiteID A00K06

Other

Ionosphere: Auroral Ionosphere (2704), Ionosphere: Electric Fields (2712), Ionosphere: Ionosphere/Atmosphere Interactions (0335), Atmospheric Processes: Thermospheric Dynamics (0358), Ionosphere: Ionospheric Irregularities

Scientific paper

The vertical component of the ion velocity measured with the European Incoherent Scatter (EISCAT) Tromsø UHF radar (69.6°N, 19.2°E) in the lower ionosphere (from 95 to 130 km) was found to be characterized by notably large variances at oscillation periods of 2-8 min. Of particular interest was the geomagnetic activity dependence above ˜106 km, which showed larger variances (100-500 m2 s-2) during periods of geomagnetic disturbance than during quiet periods. Below 106 km, the variance was less sensitive to the geomagnetic activity. Height profiles of the variance during the disturbed period showed steep increases with heights above 106 km, then reaching a peak at 120 km, where the ion gyrofrequency is equal to the modeled ion-neutral collision frequency. A theoretical prediction well reproduced the height profile for the geomagnetically disturbed period by assuming oscillations in the meridional component of the electric field. The theoretical study suggested that the electric field oscillation is a possible cause of large variances of the vertical ion speed in the polar lower ionosphere. However, below 106 km, other mechanisms were necessary.

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