Dipole tilt angle effects on the latitude of the cusp and cleft/low-latitude boundary layer

Details Dipole tilt angle effects on the latitude of the cusp and cleft/low-latitude boundary layer Dipole tilt angle effects on the latitude of the cusp and cleft/low-latitude boundary layer

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.6949n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, June 1, 1989, p. 6949-6953.

Mathematics

Logic

77

Atmospheric Boundary Layer, Dmsp Satellites, Geomagnetism, Solar Wind, Attitude (Inclination), Cusps, Noaa Satellites, Polar Caps, Solstices, Tropical Regions

Scientific paper

A large data set of approximately 12,000 Defense Meteorological Satellite Program satellite F7 crossings of the cusp or the cleft (i.e., the dayside magnetospheric boundary layer) over a 3-year period is studied for seasonal dependence in latitudinal position. A carefully tested algorithm is used to distinguish the various dayside particle precipitation regions and boundaries. It is found that in the 1100-1300 MLT sector, the cusp proper exhibits about -0.06 deg magnetic latitude shift for each degree increase in dipole tilt angle. Thus, the difference between the average summer and winter cusp positions is close to 4 deg magnetic latitude, approximately symmetric about equinox. For the cleft (magnetospheric boundary layer), the variation is smaller.

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