Abstract
The paper is concerned with the variations of solar wind kinetic energy, ion thermal energy, ion flux and momentum as observed by near-Earth spacecraft over time scales from seconds to several days. The mean values of these fluxes and characteristics of their variability are discussed. The average variations of kinetic energy and momentum flux are about 10% of the mean values over a one-hour interval. Consideration is given to the differences in the energy and momentum flux for low-velocity and high-velocity solar wind streams. The discussion is extended with an analysis of very intense disturbances of energy and momentum due to the arrival of an interplanetary shock wave at Earth.
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