Coupling of IMF B(sub Y) variations into the polar ionospheres through interplanetary field-aligned currents

Details Coupling of IMF B(sub Y) variations into the polar ionospheres through interplanetary field-aligned currents Coupling of IMF B(sub Y) variations into the polar ionospheres through interplanetary field-aligned currents

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9917309s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A9, p. 17,309-17,322

Other

17

Earth Ionosphere, Field Aligned Currents, Interplanetary Magnetic Fields, Polar Regions, Solar Terrestrial Interactions, Solar Wind, Convection, Geomagnetism, Hall Effect, Perturbation, Topology

Scientific paper

Studies of the correlation between the geomagnetic fields recorded at high-latitude observatories and the interplanetary magnetic field (IMF) observed from the IMP 8 satellite in the solar wind have indicated that variations in the IMF B(sub Y) component may generate perturbations of similar appearance in the geomagnetic north (H) components observed in the noon sector of the dayside polar cap. During southward interplanetary field conditions (IMF B(sub Z) is less than 0) these perturbations are observed to progress poleward from the cusp region across a large fraction of the dayside polar cap, changing only slightly in shapes and amplitudes. These progressing geomagnetic variations are interpreted as the footprints of the variable IMF B(sub Y) component present in the solar wind volume which is magnetically connected to the polar cap ionosphere. It is suggested in this work that both the IMF B(sub Y) variations and the corresponding variations in the H(ground) components are related to inter- planetary field-aligned components. The 'open' magnetospheric topology, resulting from the merging of the geomagnetic field and the interplanetary field during southward interplanetary field conditions, allows these interplanetary currents to flow along the merged field lines to the northern and southern polar cap ionospheres. Here they generate the convection-related Hall currents responsible for the observed geomagnetic perturbations. The closure from one polar cap to the other can be partly in the form of ionospheric Pedersen currents and partly in the form of field-aligned currents along closed field lines in the inner magnetosphere.

Affiliated with

Also associated with

No associations

Rating

Coupling of IMF B(sub Y) variations into the polar ionospheres through interplanetary field-aligned currents does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Coupling of IMF B(sub Y) variations into the polar ionospheres through interplanetary field-aligned currents, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coupling of IMF B(sub Y) variations into the polar ionospheres through interplanetary field-aligned currents will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1791215