[Loops] type II spicule paper

[Hugh S. Hudson]

This is probably one of those bridges with a troll underneath, please  
be careful.

On 31 Jul 2012, at 18:27, Petrus Martens wrote:

>
>> 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 at solar.physics.montana.edu <mailto: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
>>>>>>
>>>>>>
>>>>>>
>>>>>> <martens.vcf>_______________________________________________
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>>>>>
>>>>> _______________________________________________
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>>>>> >
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>>>>
>>>> ________________________________________________________________________
>>>> Charles Kankelborg AC7NY |
>>>> 260C EPS Building        | "If Christ is risen, nothing else  
>>>> matters.
>>>> Physics Department       |  And if Christ is not risen ---  
>>>> nothing else
>>>> Montana State University |  matters."
>>>> Bozeman, MT 59717        |
>>>> Phone: 406-994-7853      |                 --Jaroslav Pelikan
>>>> FAX:   406-994-4452      |
>>>> http://solar.physics.montana.edu/kankel/
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>
>> ========================================================
>> Viggo H. Hansteen http://www.astro.uio.no/~viggoh
>> Institutt for teoretisk astrofysikk               tel: +47-22856120
>> PB 1029, Blindern                                    fax:  
>> +47-22856505
>> N-0315 Oslo, Norway Viggo.Hansteen at astro.uio.no
>> <mailto:Viggo.Hansteen at astro.uio.no>
>> ========================================================
>>
>
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