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originally posted by: xoenneox
originally posted by: rossacus
a reply to: stormcell
One question ....how does the sun have magnetic fields if it doesn't have heavier elements like nickel to create the magnetic fields we have on earth?
...Sun may be older, than we think...they say, there's no way, that there's iron etc..but...
The first process, called the Local Dynamo, has to do with the generation of the small-scale magnetic features on the surface. These are produced by the flows of charged particles in the convecting 'granulation' regions that pock-mark the entire solar surface and create what astronomers call a 'magnetic carpet'.
The Global Dynamo, on the other hand, involves the generation and evolution of the largest features of the sun, such as sunspots, the overall magnetic polarity of the sun, and its long-term changes over the solar activity cycle.
Recent observations of the sun with the SOHO satellite have established the profiles of the flows in the solar interior. In a remarkable study of the 'seismic' properties of the solar surface, astronomers can peer into the interior of the sun just as geologists do with Earth. Just as for Earth's atmosphere, the sun has 'jet streams' and other persistent features. More importantly, the Radiative and Convective Zones can be easily studied in detail. Amazingly enough, although surface gases rotate faster at the equator than at the poles in the Convective Zone (called differential rotation), in the Radiative Zone the gases all rotate in-step as though the sun were a solid body!