Relationships Between Auroral and Magnetic Activity in the Polar Cusp/Cleft
Both large- and small-scale dynamics of the cusp aurora and cusp electrodynamics are discussed in connection with electric currents, electric field and ground magnetic perturbations. Sources of the field-aligned electric currents in the dayside polar cusp are most likely located within the boundary layers, both the frontside low latitude and the magnetotai1, where induction currents due to relative motion between the sheath plasma and the magnetosphere produces space charges. The importance of the magnetospheric magnetic field model in the study of the cusp phenomena, especially their magnetospheric source regions, is noted.
KeywordsSolar Wind Interplanetary Magnetic Field Sheath Plasma Polar Cusp Magnetic Impulse
Unable to display preview. Download preview PDF.
- Clauer, C. T., P. M. Banks, A. Q. Smith, T. S. Jørgensen, E. Friis- Christensen, S. Vennerstrøm, V. B. Wickwar, J. D. Kelly and J. Doupnik, Observation of interplanetary magnetic field and of iono-spheric plasma convection in the vicinity of the dayside polar cleft, Geophys. Res. Lett., 11, 891–894, 1984.ADSCrossRefGoogle Scholar
- Oguti, T., Poleward travel of electric current filament in the polar cap region, Rept. Ionosph. Space Res. Japan, 23, 175–184, 1969.Google Scholar
- Oguti, T., Questions on the dayside reconnection in connection with magnetospheric convection and open-close boundary, submitted to J. Geomagn. Geoelectr., 1989.Google Scholar
- Sandholt, P. E., B. Lybekk, A. Egeland, R. Nakamura and T. Oguti, Midday auroral breakup, J. Geomagn. Geoelectr., 41, in press, 1989.Google Scholar
- Willis, D. M., M. Lockwood, S. W. H. Cowley, A. P. van Eyken, B. J. I. Bromage, H. Rishbeth, P. R. Smith and S. R. Crothers, A survey of simultaneous observations of the high-latitude ionosphere and interplanetary magnetic field with EISCAT and AMPTE-UKS, J. Atmos. Terr. Phys., 48, 987–1008, 1986.ADSCrossRefGoogle Scholar