MAGION-4 observations of bow shock crossings.

Details MAGION-4 observations of bow shock crossings. MAGION-4 observations of bow shock crossings.

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999czjph..49..563s&link_type=abstract

Czech. J. Phys., Vol. 49, No. 4a, p. 563 - 578

Physics

4

Bow Shocks: Solar Wind, Bow Shocks: Interplanetary Magnetic Field

Scientific paper

During August 1995 to August 1997, the MAGION-4 satellite (subsatellite of INTERBALL-1) observed more than 850 bow shock crossings. The MAGION-4 data set covers a broad range of latitudes and local times. The MAGION-4 bow shock crossings were completed with solar wind and interplanetary magnetic field (IMF) observations to determine upstream conditions. These data were taken from the WIND observations. The time of propagation of the solar wind features from the WIND position to the bow shock was computed as a two-step approximation based on the measured solar wind velocity. The values of the solar wind dynamic pressure and IMF used for the comparison with models were computed as five-minute averages centered around the time of the crossing, determined as given above. As a measure of the uncertainty of the determination of the solar wind parameters relating to the particular crossing, the authors have computed the dispersion of each parameter. The solar wind dynamic pressure varied from 1 to 12 nPa and the Alfvénic Mach number from 4 to 50. The observations provide an excellent opportunity to test empirical models describing the bow shock position as a function of upstream parameters. The authors have calculated the predicted bow shock position for various models and then determined the distance between it and the observed locations. They have tested the influence of the solar wind and IMF fluctuations, solar wind aberration, Mach number (MA), and magnetic field strength on the precision of the mentioned models. The results show the uncertainty of the prediction of the bow shock position cannot be explained by errors in the determination of upstream parameters.

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