An injection model for type III/V bursts in solar flares
Raoult, A., A. Mangeney, and L. Vlahos, An injection model for type III/V bursts in solar flares, A&A, 233, 229-234 (1990) (ADS)
(click on the image for a larger version)
An early view of the loop-loop interaction idea, inspired by solar
radio type III and type V bursts.
This cartoon may have originated with the
Heyvaerts cartoon but
with the interesting application to radio type III bursts, which often
appear in the impulsive phase of a flare (as well as elsewhere).
The Archivist takes a dim view of appealing to loop-loop
interactions in general (what's a loop, and what's outside of it? More loop?).
Why do the field line lean towards each other at some particular
altitude?
The physics must lie in the inductive coupling of the currents embedded in
any interesting loop, since the energy principle would dictate when
reconnection would happen spontaneously.
But this does look like a very reasonable geometry.
There also seems to be a fatal flaw: the open field lines in panel (b)
were closed before the event, and could only open on an Alfvén
time scale - the electrons therefore cannot have immediate access to the upper
corona or heliosphere.
For non-helioradiophysicists, the type III bursts are
the "fast drift" phenomenon known to reflect the presence of
weakly relativistic electron beams.
Type V is an extension, like a little flag, at the long-wavelength
ends of a type III group.
An early view of the loop-loop interaction idea, inspired by solar radio type III and type V bursts. This cartoon may have originated with the Heyvaerts cartoon but with the interesting application to radio type III bursts, which often appear in the impulsive phase of a flare (as well as elsewhere). The Archivist takes a dim view of appealing to loop-loop interactions in general (what's a loop, and what's outside of it? More loop?). Why do the field line lean towards each other at some particular altitude? The physics must lie in the inductive coupling of the currents embedded in any interesting loop, since the energy principle would dictate when reconnection would happen spontaneously. But this does look like a very reasonable geometry. There also seems to be a fatal flaw: the open field lines in panel (b) were closed before the event, and could only open on an Alfvén time scale - the electrons therefore cannot have immediate access to the upper corona or heliosphere.
For non-helioradiophysicists, the type III bursts are the "fast drift" phenomenon known to reflect the presence of weakly relativistic electron beams. Type V is an extension, like a little flag, at the long-wavelength ends of a type III group.