Cusp width and B(z) - Observations and a conceptual model

Details Cusp width and B(z) - Observations and a conceptual model Cusp width and B(z) - Observations and a conceptual model

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9213673n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Dec. 1, 1987, p. 13673-13678.

Mathematics

Logic

44

Electron Precipitation, Interplanetary Magnetic Fields, Low Altitude, Magnetic Storms, Particle Precipitation, Polar Cusps, Dmsp Satellites, Polar Orbits

Scientific paper

Because a southward turning of the interplanetary magnetic field B(z) enhances dayside merging, leading to an equatorward motion of the equatorward edge of the cusp, it might be supposed that the cusp latitudinal width would be larger for a southward B(z) condition. The Defense Meteorological Satellite Program F7 observations confirm two previous case studies showing that the cusp low-altitude latitudinal extent is actually narrower when B(z) is southward than when B(z) is northward. The earlier studies dealt with intense geomagnetic storms; examples presented here show that it is routine to observe a narrowing of the cusp width following a southward turning of B(z). In addition, a simple conceptual model is presented, that shows how enhanced tailward convection of the newly opened field lines during periods of southward B(z) can account for the observed narrowness.

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