Auroral and sub-auroral F-layer irregularities and high plasma convection during the magnetically active periods of 17-24 September 1984

Details Auroral and sub-auroral F-layer irregularities and high plasma convection during the magnetically active periods of 17-24 September 1984 Auroral and sub-auroral F-layer irregularities and high plasma convection during the magnetically active periods of 17-24 September 1984

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991angeo...9..614a&link_type=abstract

Annales Geophysicae (ISSN 0939-4176), vol. 9, Sept. 1991, p. 614-627. Research supported by U.S. Navy and NSF.

Physics

Auroral Zones, F Region, Magnetic Storms, Nonuniform Plasmas, Ring Currents, Spread F, Electron Density (Concentration), Magnetohydrodynamic Stability

Scientific paper

Using observations of F-layer irregularities by satellite scintillation and spread-F techniques, three magnetic storm periods were studied for their adherence to instability processes. The data on irregularities taken from auroral and subauroral locations were compared with electron temperature (Te), electron density (Ne), and ion convection using observations of the Millstone Hill incoherent scatter radar during the Equinox Transition Period of September 17-24, 1984. Periods when shear convection patterns were observed were correlated with the irregularities but the most significant correlation was with high convection velocities. Gradients of Te and Ne were examined as a function of latitude and of time and the possible invocation of gradient drift and current convective instabilities assessed for particular periods. During the times of the Harang discontinuity, irregularity levels were a minimum; this corresponded to a previously-noted dip in convection velocity at higher latitudes during periods when Kp is greater than 4.

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