Radar and optical measurement of ionospheric processes associated with intense subauroral electric fields

Details Radar and optical measurement of ionospheric processes associated with intense subauroral electric fields Radar and optical measurement of ionospheric processes associated with intense subauroral electric fields

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.5350p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, May 1, 1989, p. 5350-5366.

Physics

32

Earth Ionosphere, Electric Fields, Incoherent Scatter Radar, Optical Measurement, Radar Measurement, Electron Density Profiles, Field Aligned Currents, Magnetic Storms, Plasma Density

Scientific paper

Observations of very large poleward-directed electric fields are obtained with the Millstone Hill incoherent scatter radar operated on selected evenings in a rapid azimuthal scan centered on magnetic west. On the evenings of April 20 and 21, 1985, during an intense magnetic storm (Kp greater than 8+), large ionospheric electric fields (E greater than 80 mV/m) were detected along the edge of the auroral oval. An L shell-aligned (zero order) deep trough in electron density is colocated with these large electric fields at L shells as low as L = 2.8. Elevated ion and electron temperatures in the trough are reported, and it is conjectured that these may contribute to the rapid decay. It is also shown that the associated field-aligned currents are very weak, but that it is the F region structure which dominates the conductivity gradient rather than the E region.

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