|Parameter||Mean Value||5-95% Range|
|Speed (km/s)||468||320 - 710|
|density (protons/cc)||8.7||3.2 - 20|
|Alfvenic Mach No.||10.7||4.4 - 20|
|Sonic Mach No.||7.7||5.6 - 10|
||B| (nano-Tesla)||6.6||2.2 - 9.9|
|Proton Temperature (K)||120,000||10,000 - 300,000|
|Electron Temperature (K)||140,000||90,000 - 200,000|
|Alfven Speed (km/s)||50||30 - 100|
|Sound Speed (km/s)||63||41 - 91|
Other interesting facts about the solar wind:
- Consists dominantly of protons and electrons in equal numbers with a small (~5%) amount of ionized Helium and an even smaller percentage of heavier ions.
- The average solar wind takes about 4 days to travel between the corona and the Earth.
- Most of the energy transported by the solar wind is in the form of kinetic energy. The solar wind carries 1.7E27 ergs/s of kinetic energy on the average through a sphere at 1 au. (Compare this to 0.05E27 ergs/s of thermal energy and 0.025E27 ergs/s of magnetic energy.)