Astrophysics (Index)About

standard model of a flare

(description of how solar flares function)

The standard model of a flare (solar flare) is that some magnetic field lines at the surface of the Sun forming a loop up into the corona and back (often in the general region of sunspots), are opened by some means: no longer looping, but continuing out into space, or more accurately, "their turn back to the Sun is now very far away, out in the enclosing overall magnetic field". The lines reconnect, forming new loops in/out of the Sun that don't reach as far out, with the rest of the old loops forming loops separate from the Sun. This reconfiguration holds less magnetic-field energy, and the energy so-released accelerates electrons that have been traveling along the lines. Accelerated electrons reaching chromosphere heat its plasma, conductive material which heated, expands (evaporates) up into the magnetic field loops, and between them, they produce various types of electromagnetic radiations emission including black-body radiation (hotter, thus much higher frequency than normal sunshine, including much UV and higher), and synchrotron radiation from the charged plasma particles passing through the magnetic field loops.


(Sun,magnetism,theory,corona)
Further reading:
http://en.wikipedia.org/wiki/Solar_flare
https://www3.mpifr-bonn.mpg.de/staff/mmassi/c4-Model.pdf

Index