[Loops] type II spicule paper

[Serge KOUTCHMY]

Dear Jim,

I did not think that somebody seriously believes that the vast amount of 
rather cool spicular plasma launched towards the corona provides the 
material of the corona. There are 2 to 3 orders of magnitude too much of 
mass. Most of the material comes back under the action of the gravity. 
Some part goes to the sheath of spicules but this is not clear. However, 
in case of a tall spicule like the top of macro-spicules or giant 
spicules above polar regions (called before at total eclipses a spike 
and now called an EUV event in He+ and CIV), a SXR jetlet can often be 
observed in hot coronal lines, with large upwards velocities. Small 
redshifts are also observed around, at TR temperature. There is little 
doubt that they are guided and confined by the coronal magnetic field, 
extracting some free energy during the explosive phase, such that they 
participate in both the mass supply and the heating of the corona. I 
thought a general consensus exists about that, is not?

Your paper is a brilliant 1D demonstration concerning the chromospheric 
spicules. What about considering a filling factor? For cool spicules it 
is of small values and at TR temperatures, it is of very low values. At 
coronal temperature, it could be zero?

Best,

S.



Le 09/08/2012 16:06, Klimchuk, James A. (GSFC-6710) a écrit :
> Hi Giulio,
>
>       Maria Madjarska says the same thing.  And it makes me happy!  It only strengthens the case that spicules do not provide the corona with much, if any, of its hot plasma.  Keep pushing this result!!
>
> Thanks,
> Jim
>
> James A. Klimchuk
> NASA/GSFC
> James.A.Klimchuk at nasa.gov
> ________________________________________
> From: loops-bounces at solar.physics.montana.edu [loops-bounces at solar.physics.montana.edu] On Behalf Of Giulio Del Zanna [G.Del-Zanna at damtp.cam.ac.uk]
> Sent: Thursday, August 09, 2012 3:27 AM
> To: A mailing list for scientists involved in the observation and modeling of solar loop structures
> Subject: Re: [Loops] type II spicule paper
>
> Jim,
>
> interesting paper, but I still have not seen convincing evidence that
> material at chromospheric temperatures travelling upwards gets heated
> to coronal temperatures. It is clear that all the SDO AIA bands
> have significant contributions from lines formed below 1 MK (2011,A&A,535, A46)
> as we discussed at the last loop meeting.  Some residual emission above
> 1 MK might be present but there are a lot of uncertainties..
>
>
> cheers
>
> Giulio
> --
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