Spread-F ionospheric irregularities and their relationship to stable auroral red arcs at magnetic mid-latitudes

Details Spread-F ionospheric irregularities and their relationship to stable auroral red arcs at magnetic mid-latitudes Spread-F ionospheric irregularities and their relationship to stable auroral red arcs at magnetic mid-latitudes

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46..335r&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, April 1984, p. 335-342.

Physics

14

Auroral Arcs, Ionospheric Disturbances, Ionospheric Electron Density, Red Arcs, Solar Activity Effects, Spread F, Ionograms, Irregularities, Magnetic Disturbances, Midlatitude Atmosphere, Plasma Frequencies, Statistical Correlation, Sunspot Cycle

Scientific paper

A detailed analysis of Argentine Islands ionograms has been performed, and the results are presented. A very significant increase in the occurrence of spread-F and a reduction in the maximum plasma frequency of the stable auroral red arc (SAR arc)-associated layer compared to an undisturbed layer is found. Considerable spread-F is detected in two regions associated with the SAR arc and the poleward edge of the midlatitude ionospheric trough. These regions are separated by a region associated with the midlatitude trough minimum, where comparatively little spread-F is seen. A positive correlation is observed between spread-F occurrence and magnetic activity at sunspot minimum. A weak negative correlation at sunspot maximum is found for K magnetic index of five or less, and a significant increase for K of six or more.

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