Micha H. schrieb:
Hallo,
wie sieht es denn eigentlich mit den Coronal Holes im Minimum aus? Werden die auch weniger oder schwächer?
Space weather is influenced not only by the presence of active regions, but also by coronal holes - open magnetic field regions of the corona that have low density and brightness.
At solar minimum, the Sun generally has a coronal hole at each of its poles and none near its equator. As solar activity increases, the coronal hole at the Sun's north pole shrinks, other smaller coronal holes emerge near it, and they appear to migrate toward the solar equator and eventually to the south pole.
The same happens in reverse at the Sun's south pole.
At solar maximum, the coronal holes are found near the equator along with active regions. As the Sun spins, coronal mass ejections and high-energy atomic particles from solar flares are sprayed at the Earth like water from a twirling garden sprinkler.
As the solar cycle continues, the coronal holes complete their migration to the opposite pole, causing the Sun's magnetic poles to reverse.
The changes in the magnetic field that lead to the flipping of the Sun's magnetic poles is the major reason for long-term variations in space weather.
Der ganze Artikel hier zu finden:
http://www.spaceflightnow.com/news/n020 ... ceweather/
Gruessle
Peter