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首页> 外文期刊>Journal of geophysical research >Meridional Distribution of Middle-Energy Protons and Pressure-Driven Currents in the Nightside Inner Magnetosphere: Arase Observations
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Meridional Distribution of Middle-Energy Protons and Pressure-Driven Currents in the Nightside Inner Magnetosphere: Arase Observations

机译：Meridional Distribution of Middle-Energy Protons and Pressure-Driven Currents in the Nightside Inner Magnetosphere: Arase Observations

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abstract_textpWe examined the average meridional distribution of middle-energy protons (10-180 keV) and pressure-driven currents in the nightside (20-04 hr magnetic local time) ring current region during moderately disturbed times using the Arase satellite's data. Because the Arase satellite has a large inclination orbit of 31 degrees, it covers the magnetic latitude (MLAT) in the range of -40 degrees to 40 degrees and a radial distance of 6R(E). We found that the plasma pressure decreased significantly with increasing MLAT. The plasma pressure on the same L* shell at 30 degrees MLAT 40 degrees was similar to 10-60 of that at 0 degrees MLAT 10 degrees, and the rate of decrease was larger on lower L* shells. The pressure anisotropy, derived as the perpendicular pressure divided by the parallel pressure minus 1, decreased with radial distance and showed a weak dependence on MLAT. The magnitude of the plasma beta at 30 degrees MLAT 40 degrees was 1 or 2 orders smaller than that at 0 degrees MLAT 10 degrees. The plasma pressure normalized by the value at 0 degrees MLAT 10 degrees estimated from the magnetic strength and anisotropy was roughly consistent with the observed plasma pressure for L* = 3.5-5.5. The azimuthal pressure-gradient current derived from the plasma pressure was distributed over MLAT similar to 0-20 degrees , while the curvature current was limited within MLAT similar to 0-10 degrees . We suggest that the latitudinal dependence should be taken into account in interpretations of plasma parameters in successive orbits during magnetic storms./p/abstract_text

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