[Loops] type II spicule paper

[Hugh S. Hudson]

Actually, my use of "Scudder" was shorthand for "plasma kinetic  
effects." I don't regard these as unrelated to "heating" in general; I  
doubt that a paper can draw general conclusions in this area without a  
discussion of that physics.

I note that your definition of evaporation is inconsistent with our  
normal usage for flares, where non-thermal particles can do the dirty  
work. But perhaps I will read on past this point!

Cheers

Hugh

On 31 Jul 2012, at 16:45, Klimchuk, James A. (GSFC-6710) wrote:

> Right, Piet.   They are totally unrelated.
>
> Jim
>
>> -----Original Message-----
>> From: loops-bounces at solar.physics.montana.edu [mailto:loops-
>> bounces at solar.physics.montana.edu] On Behalf Of Petrus Martens
>> Sent: Tuesday, July 31, 2012 10:33 AM
>> To: loops at solar.physics.montana.edu
>> Subject: Re: [Loops] type II spicule paper
>>
>> On 7/31/12 8:27 AM, Hugh S. Hudson wrote:
>>> It may be a great paper, but why is there no citation of Scudder's  
>>> work?
>>
>> Would have been useful.  I don't think Jim's results invalidate  
>> Scudder's
>> results though.
>>
>> Piet
>>
>>
>>>
>>> Hugh
>>>
>>> On 31 Jul 2012, at 16:12, Petrus Martens wrote:
>>>
>>>> Hey, great paper!  Glad that someone looked into that.
>>>>
>>>> Cheers,
>>>>
>>>> Piet
>>>>
>>>> On 7/31/12 7:47 AM, Klimchuk, James A. (GSFC-6710) wrote:
>>>>> Dear friends,
>>>>>
>>>>>      You might be interested in my recent paper on "The Role of
>>>>> Type II Spicules in the Upper Solar Atmosphere,"  which can be
>>>>> downloaded at
>>>>> http://arxiv.org/abs/1207.7048
>>>>>
>>>>> Cheers,
>>>>>
>>>>> Jim
>>>>>
>>>>> ABSTRACT:
>>>>>
>>>>> We examine the suggestion that most of the hot plasma in the Sun's
>>>>>
>>>>> corona comes from type II spicule material that is heated as it is
>>>>>
>>>>> ejected from the chromosphere.  This contrasts with the  
>>>>> traditional
>>>>>
>>>>> view that the corona is filled via chromospheric evaporation that
>>>>>
>>>>> results from coronal heating.  We explore the observational
>>>>>
>>>>> consequences of a hypothetical spicule dominated corona and  
>>>>> conclude
>>>>>
>>>>> from the large discrepancy between predicted and actual  
>>>>> observations
>>>>>
>>>>> that only a small fraction of the hot plasma can be supplied by
>>>>>
>>>>> spicules (<2% in active regions and <5% in the quiet Sun).  The
>>>>>
>>>>> red-blue asymmetries of EUV spectral lines and the ratio of lower
>>>>>
>>>>> transition region (LTR; T<0.1 MK) to coronal emission measures
>>>>>
>>>>> are both predicted to be 2 orders of magnitude larger than  
>>>>> observed.
>>>>>
>>>>> Furthermore, hot spicule material would cool dramatically by
>>>>>
>>>>> adiabatic expansion as it rises into the corona, so coronal  
>>>>> heating
>>>>>
>>>>> would be required to maintain the high temperatures that are  
>>>>> seen at
>>>>>
>>>>> all altitudes.  The necessity of coronal heating is inescapable.
>>>>>
>>>>> Traditional coronal heating models predict far too little emission
>>>>>
>>>>> from the LTR, and we suggest that this emission comes primarily  
>>>>> from
>>>>>
>>>>> the bulk of the spicule material that is heated to <0.1 MK and
>>>>>
>>>>> is visible in He II (304 A) as it falls back to the surface.
>>>>>
>>>>>
>> **************************************************************
>> ******
>>>>> ************
>>>>>
>>>>>
>>>>> James A. Klimchuk
>>>>>
>>>>> NASA Goddard Space Flight Center
>>>>>
>>>>> Solar Physics Lab, Code 671
>>>>>
>>>>> Bldg. 21, Rm. 158
>>>>>
>>>>> Greenbelt, MD  20771
>>>>>
>>>>> USA
>>>>>
>>>>> Phone:  1-301-286-9060
>>>>>
>>>>> Fax:      1-301-286-7194
>>>>>
>>>>> E-mail: James.A.Klimchuk at nasa.gov
>> <mailto:James.A.Klimchuk at nasa.gov>
>>>>>
>>>>> Homepage:
>>>>>
>> https://sedupdate.gsfc.nasa.gov/sed/index.cfm?fuseAction=people.jump
>>>>> Bio&&iPhonebookId=15844
>>>>>
>>>>>
>>>>> No endorsement by NASA is implied for any correspondence related  
>>>>> to
>>>>> my role as an officer of professional organizations (American
>>>>> Geophysical Union, International Astronomical Union, American
>> Astronomical Society).
>>>>>
>>>>>
>> **************************************************************
>> ******
>>>>> ************
>>>>>
>>>>>
>>>>>
>>>>>
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>>>>>
>>>>
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