The color bar indicates green for low, yellow for moderate, and red for high solar wind speed. The arrow moves to indicate speed similar to a car's speedometer. The scale is log 10 over the full range. If the density or speed data are missing, the arrow will not appear. The arrow will move to the location on the scale corresponding to the actual value of the latest 15 minute average of the Dynamic Pressure P of the solar wind.
Dynamic Pressure is a function of speed and density.
The color bar indicates green for low, yellow for moderate, and red for high dynamic pressure. In this definition, P is the momentum flux of the solar wind. This definition has is origin the flow equations that describe conservation of momentum. In this definition, P is the kinetic energy per unit volume in the wind. UTC in five minute intervals.