The altitude of type 3 auroral irregularities - Radar interferometer observations and implications

Details The altitude of type 3 auroral irregularities - Radar interferometer observations and implications The altitude of type 3 auroral irregularities - Radar interferometer observations and implications

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9617805s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Oct. 1, 1991, p. 17,805-17,811.

Physics

13

Auroral Spectroscopy, Radar Scattering, Radio Interferometers, Coherent Radar, Coherent Scattering, Ion Cyclotron Radiation, Oxygen Ions

Scientific paper

Altitude measurements are presented of type 3 auroral irregularities, acquired in northern Scandinavia in March 1989 during the second E Region Rocket Radar Instability Study campaign, that provide conclusive arguments against the electrostatic ion cyclotron instability theory. Interferometric analyses of coherent radar observations with a portable radar interferometer show that type 3 events occur at typical electrojet altitudes (100-120 km), at which the ion collision frequency is greater than the ion gyrofrequency, and no cyclotron motion is possible.

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