Polar cusp topology and position as a function of interplanetary magnetic field and magnetic activity - Comparison of a model with Viking and other observations

Details Polar cusp topology and position as a function of interplanetary magnetic field and magnetic activity - Comparison of a model with Viking and other observations Polar cusp topology and position as a function of interplanetary magnetic field and magnetic activity - Comparison of a model with Viking and other observations

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9615789s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Sept. 1, 1991, p. 15,789-15,800.

Mathematics

Logic

26

Atmospheric Models, Geomagnetism, Interplanetary Magnetic Fields, Magnetic Field Configurations, Polar Cusps, Annual Variations, Boundary Layers, Diurnal Variations, Earth Ionosphere, Earth Magnetosphere, Geomagnetic Tail, Magnetopause

Scientific paper

The cusp position in the ionosphere is determined and the field topology around the outer cusp is determined by using a family of quantitative magnetospheric models. It is demonstrated that the 'cusp proper' (about 1 deg x 2 hrs), observed in particle precipitation patterns, can be defined as the footprint of the magnetopause current layer with field lines connected to the interplanetary medium via a normal magnetic field component. It is suggested that the finite-sized physical cusp originates as a result of gyroviscous erosion at the magnetopause current layer that enlarges the topologically singular magnetic cusp. It is inferred that the instantaneous effect of a negative Bz component on the equatorward shift of the cusp is smaller than an indirect effect due to increased magnetic activity. Some of the model predictions are compared with cusp observations made on board the Swedish Viking satellite. Both the Viking and other observations can be quantitatively explained by the model predictions.

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