Dependence of the polar cap structure on parameters of the interplanetary medium based on penetration deduced from solar cosmic ray electrons

Details Dependence of the polar cap structure on parameters of the interplanetary medium based on penetration deduced from solar cosmic ray electrons Dependence of the polar cap structure on parameters of the interplanetary medium based on penetration deduced from solar cosmic ray electrons

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990angeo...8..369g&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 8, May 1990, p. 369-375.

Physics

1

Interplanetary Medium, Polar Caps, Solar Cosmic Rays, Solar Electrons, Electron Precipitation, Intercosmos Satellites, Interplanetary Magnetic Fields, Solar Wind

Scientific paper

The structure of the polar cap boundaries is studied, based on the penetration of solar cosmic ray electrons measured by the low altitude satellite Intercosmos-17. The boundary location is discussed in connection with parameters of the interplanetary medium, such as the solar wind density N, the velocity V, the characteristic solar wind pressure and the interplanetary magnetic field Bz component. From the data obtained during four events, during which solar cosmic ray electrons were present in interplanetary space, it is possible to derive how the boundary of electron penetration in the dayside sector is controlled by the solar wind pressure and by Bz. In the evening-midnight-morning sector, electrons are seen in two regions: in the polar cap on field lines belonging to the geomagnetic lobe and on field lines of the plasmasheet. When a geomagnetic substorm is in progress, the boundaries of these two regions are not only controlled by parameters of the solar wind and the IMF, but also by the phase of the substorm.

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