DOK-2 ion fluxes upstream from the bow shock: characteristics from 4 years of Interball-1 measurements

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The spectrometer DOK-2 on Interball-1 provided energetic (˜20 ˜600 keV) ion fluxes and spectra for various geomagnetic and interplanetary conditions during the spacecraft's 5-year mission. From April to July in 1996 2000, the spacecraft's apogee lay upstream from the dayside bow shock. We present observations of the diffusive ion flux in the upstream region as a function of energy, magnetic field connection and distance to the position of a model bow shock, solar wind velocity, and geomagnetic activity for years 1996 1998 and a part of year 1999. Measurements by both ion detectors combined into 14 energy ranges are used for the analysis. Although fluxes of ions with energies up to ˜150 keV depend primarily upon the geometry of the connection to the bow shock, the dependence of fluxes on geomagnetic activity, indicating the important contribution of particles leaking the magnetosphere, increases with the energy.

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