باد ِ قطبی
Fr.: vent polaire
1) The → solar wind occurring at high latitudes during low
→ solar activity as a fast
(around 750 km s-1) and relatively
steady flow. A remarkable feature of the polar wind is the ubiquitous presence of
an intense flow of → Alfvénic fluctuations.
2) One of the two main wind components in → B[e] stars.
The pole is hotter than the equator due to the
→ gravity darkening effect
leading to a relatively fast, low-density wind driven by Fe IV lines.
The other component is the → equatorial wind. The mechanism
put forward to explain this wind morphology is the rotationally induced
→ bistability mechanism.
3) An extremely cold wind blowing from the north or south polar regions of the Earth.
→ polar; → wind.