[Loops] type II spicule paper

[Petrus Martens]

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 at 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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>
> ________________________________________________________________________
> Charles Kankelborg AC7NY |
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>
>
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>
>
>
>

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