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About the magnetic origin of Chromospheric Spicules and CoronalJets

Published online by Cambridge University Press:  27 June 2012

S. Koutchmy
Affiliation:
Institut d’Astrophysique de Paris, UMR 7095, CNRS and UPMC, 98 Bis Bd. Arago, 75014 Paris, France
B. Filippov
Affiliation:
Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences, Troitsk, Moscow Region 142190, Russia
E. Tavabi
Affiliation:
Physics Department, Payame Noor University, 19395-3697 Tehran, I, R. of Iran, Iran
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Abstract

Observations of jet- like phenomena near the solar limb are reported for a long time,first in Hα (Secchi observations of spicules in the 1870 ies), and after,from eclipse high resolution coronal images taken in white-light (1920–1973) as spikystructures. EUV jets were reported in the 70 ies from rocket and space-borne CIVfiltergrams and finally X-EUV jets were reported from SXT observations of Yohkoh and fromEIT and CDS SoHO observations. There is now little doubt that they are of magnetic originalthough no magnetic field measurements exist for these regions and thermo-dynamicalmodels are still work out. New observations of both spicules and jets with the SOT/SXT ofHinode were subjected to an analysis showing the influence of the null point(s) of themagnetic field. The collective behavior of the H CaII SOT(Hinode) time sequences ofprocessed with the Madmax operator images of limb spicules show the torsional effectswhich were partly suggested before from the interpretation of high resolution limb spectrataken on Russian coronagraphs and the VTT at SacPeak. 100 s and shorter period waves arerecorded. We propose a reconnection process occurring at the top of an emerging twistedflux tube for explaining some peculiarities of the spicular eruptions and possibly, as aviable mechanism for explaining the SXR jet eruptions. The result of a numerical 3Dmodeling illustrates this erupting mechanism although the behavior of the magneto-plasmastructure near a null point, as shown by coronal filtergrams, does not necessary implyreconnections, especially the case of jets making a long coronal ray we observed inwhite-light with Lasco C2.

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References

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