INTERBALL observations of the high-altitude cusp-like plasma: a statistical study.

Details INTERBALL observations of the high-altitude cusp-like plasma: a statistical study. INTERBALL observations of the high-altitude cusp-like plasma: a statistical study.

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999czjph..49..695m&link_type=abstract

Czech. J. Phys., Vol. 49, No. 4a, p. 695 - 709

Physics

6

Earth Magnetosphere: Solar Wind, Earth Magnetosphere: Interplanetary Magnetic Field

Scientific paper

The width of the cusp region is an indicator of the strength of the merging process and the degree of opening of the magnetosphere. The location of the cusp precipitation has been extensively studied in low altitudes during past decades. The most extensive data set has been collected by the DMSP satellites orbiting at 835 km altitude. It has been documented that the position of the cusp region strongly depends on the state of interplanetary medium, mainly on the direction of the IMF and on the magnitude of the solar wind dynamic pressure. During two years, the MAGION-4 satellite as a part of the INTERBALL project has collected a unique data set of cusp-like plasma observations in middle and high altitudes. For a comparison of high- and low-altitude cusp determination, the authors map their observations of cusp-like plasma along the magnetic field lines down to the altitude of 835 km. They use the Tsyganenko 1996 model of the magnetospheric magnetic field for the mapping, taking actual solar wind and IMF parameters from the WIND observations. The footprint positions show substantial latitudinal dependence on the dipole tilt angle. The authors fit this dependence with a linear function and subtract this function from observed cusp position. This process allows them to study both statistical width and location of the inspected region as a function of the solar wind and IMF parameters. Their processing of the MAGION-4 measurements shows that high-altitude regions occupied by the cusp-like plasma (cusp and cleft) are projected onto a much broader area (in magnetic local time as well as in a latitude) than that determined in low altitudes. The trends of the shift of the cusp position with changes of the IMF direction established by low-altitude observations have been confirmed.

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