On the threshold electric field for the about 1-m auroral irregularity appearance

Details On the threshold electric field for the about 1-m auroral irregularity appearance On the threshold electric field for the about 1-m auroral irregularity appearance

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9412043k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Sept. 1, 1989, p. 12043-12048.

Physics

5

Atmospheric Electricity, Auroral Electrojets, Backscattering, Auroral Echoes, Eiscat Radar System (Europe), Ionospheric Electron Density

Scientific paper

The electric field threshold for 1-m auroral electrojet irregularity excitation is studied using data from the special Finnish EISCAT experiment held on November 17, 1983. It is found that at times irregularities can arise when the ionospheric electric field is 5-15 mV/m; i.e., well below the Farley-Buneman instability threshold. The electron density fluctuations derived here are increased when the E field becomes more than 15 mV/m. As a result the dependence of electron density fluctuation amplitude on electric fields has a kind of a 'soft' E field threshold. Possible reasons for such a dependence are discussed. It is shown that unresolved ionospheric microstructure in the radar scattering volume can cause this 'threshold spreading'.

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