And if you start believing in Scudders ideas on coronal heating through velocity filtration I've got a good deal on a bridge between Brooklyn and Manhattan I can recommend.
Too late! I already bought it.
Piet
Best wishes, Viggo
On Jul 31, 2012, at 18:57 , Petrus Martens wrote:
On 7/31/12 10:42 AM, Charles C. Kankelborg wrote:
So, Anderson concluded that the velocity filtration model needed to be redone with Coulomb collisions included. Dorelly and Scudder came back in 2003 with a paper concluding that "the electron heat flux is determined by the essentially collisionless high-energy tail" of the distribution:
http://adsabs.harvard.edu/abs/2003JGRA..108.1294D
Does that mean the coulomb collisions don't really affect prediction of energy transport? I haven't followed the trail of citations any farther...
Ah, now I remember! The mean-free-path for high energy electrons is of the order of the loop length (has to be be; if it is longer there is no coronal heating, if it is much shorter likewise). So chromospheric electrons in some energy range will contribute to coronal heating. Now the question is whether there will be enough of them.
Cheers,
Piet
Charles
On 2012 Jul 31, , at 9:27 AM, Dana Longcope wrote:
Stephen Anderson did a very thorough analysis of how Coulomb collisions affect the model.
http://adsabs.harvard.edu/abs/1994ApJ...437..860A
dana
Dana Longcope | Dept. of Physics Professor | Montana State University (406) 994-7851 | Bozeman, MT 59717 dana@solar.physics.montana.edu mailto:dana@solar.physics.montana.edu
On Jul 31, 2012, at 9:20 AM, Petrus Martens wrote:
Do you mean velocity filtration, where the corona is simply particles from the
tail of the chromospheric distribution function? That theory has been largely discredited.
That's news to me. Do you have a reference?
Piet
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