Ionospheric Hall conductivity deduced from ground-based measurements

Details Ionospheric Hall conductivity deduced from ground-based measurements Ionospheric Hall conductivity deduced from ground-based measurements

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.4125n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, May 1, 1988, p. 4125-4130. DFG-supported research.

Physics

3

Eiscat Radar System (Europe), Electric Fields, Hall Effect, Ionospheric Conductivity, Magnetometers, Atmospheric Models, Plasma Waves, Radar Scattering

Scientific paper

The ionospheric height-integrated Hall conductivity has been derived from two different techniques: (1) by combining ground-based magnetometer observations with measurements of the ionospheric electric field made by the Scandinavian Twin Auroral Radar Experiment (STARE), a coherent radar system, and (2) by combining electron density measurements made by the European incoherent scatter radar (EISCAT) with a neutral atmosphere model. For the events analyzed, EISCAT did not operate in a mode that allowed the electron and ion temperatures to be measured below 131 km. In the analysis, these temperatures are therefore assumed to be of the same magnitude. For small electric fields (25 mV/m) the two conductivity estimates were found to be in good agreement. However, for large fields 75 mV/m) the former method yields a conductivity value larger by a factor of 1.5 than the latter method. These results are interpreted as being due to an increase of the electron temperature above the ion temperature, possibly associated with the excitation of unstable short-scale plasma waves in the ionospheric E region. The combination of STARE and magnetometer data is demonstrated to lead to realistic estimates of the Hall conductivity in the eastward electrojet.

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