Some observations of radio auroral backscatter at 140 MHz during E-region electron gas heating

Details Some observations of radio auroral backscatter at 140 MHz during E-region electron gas heating Some observations of radio auroral backscatter at 140 MHz during E-region electron gas heating

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993angeo..11..283h&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 11, no. 4, p. 283-295.

Other

4

Auroral Electrojets, Backscattering, E Region, Electron Energy, Ionospheric Drift, Coherent Radar, Ionospheric Electron Density, Plasma Waves

Scientific paper

Simultaneous incoherent (EISCAT) and coherent (STARE) scatter measurements from a common ionospheric volume in the auroral electrojet are compared during a few events of anomalous E-region electron heating. The observations used in this study show that electron heating is always accompanied by enhanced 140 MHz backscatter intensities and low electron densities, but the data alone cannot establish a cause and effect relationship. There is probably a threshold electric field for substantial electron heating to occur, well above the threshold of about 15-20 mV/m required for plasma wave generation by the modified two stream, or Farley-Buneman, instability. The data indicate that the electron heating mechanism becomes effective if electric fields become higher than 40-50 mV/m, and that the ambient plasma density plays a role in the process. The magnitude of the irregularity velocity often, but not always, increases during heating, probably because of elevations of the ion acoustic speed. On the other hand, the direction of the irregularity velocity undergoes a counterclockwise rotation relative to the E x B electron drift, i.e., increasing the angle to the electric field.

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