Energy, momentum, and mass fluxes from sun in different types of solar wind streams observed aboard Prognoz 7

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Current Sheets, Heliosphere, Satellite Observation, Solar Wind, Stellar Mass Ejection, Prognoz Satellites, Solar Corona, Solar Magnetic Field

Scientific paper

On the basis of a study of solar wind hydrodynamic parameters measured on board the Prognoz 7 satellite we selected five different types of solar wind and investigated variations of several MHD parameters, including energy, momentum, and mass fluxes, in different types of solar wind streams. It is found that higher than average ratios between thermal ion pressure and magnetic pressure are often observed in the heliospheric current sheet (HCS) and in plasma formed during coronal mass ejections. In quasi-stationary streams (i.e. in streams from regions with the magnetic field configuration of the type of streamers and coronal holes), the momentum fluxes are equal; the momentum flux increases in the streams disturbed by nonstationary solar corona events and in HCS. The thermal and kinetic ion energy flux in disturbed streams and in HCS is higher by 2-3 times than in quasi-stationary streams. Nevertheless, taking into account the duration and the appearance rate of different streams, the sun's loss of thermal and kinetic energy in streams from open coronal magnetic field regions is higher by 2-5 times than in HCS and in disturbed streams.

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