[Loops] type II spicule paper

Klimchuk, James A. (GSFC-6710) james.a.klimchuk at nasa.gov
Tue Jul 31 08:44:39 MDT 2012


Hi Hugh,

    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.  But how does it apply to my paper anyway?  I have addressed the suggestion that the corona is due to spicule material that is heated as it is ejected.  This is completely different, no?

Thanks,
Jim

> -----Original Message-----
> From: loops-bounces at solar.physics.montana.edu [mailto:loops-
> bounces at solar.physics.montana.edu] On Behalf Of Hugh S. Hudson
> Sent: Tuesday, July 31, 2012 10:27 AM
> To: A mailing list for scientists involved in the observation and modeling of
> solar loop structures
> Subject: Re: [Loops] type II spicule paper
> 
> It may be a great paper, but why is there no citation of Scudder's work?
> 
> 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.jumpB
> >> io&&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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