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Revision of Solar Spicule Classification View all abstracts by submitter

Yuzong Zhang   Submitted: 2012-02-20 22:11

Solar spicules are the fundamental magnetic structures in thechromosphereand considered to play a key role in channeling the chromosphere andcorona.Recently, it was suggested by De Pontieu et al. that there were twotypes ofspicules with very different dynamic properties, which were detectedby space-time plot technique in the Ca II H line (3968A) wavelength fromHinode/SOTobservations. 'Type I' spicule, with a 3-7 minute lifetime, undergoesa cycle ofupward and downward motion; in contrast, 'Type II' spicule fades awaywithindozens of seconds, without descending phase. We are motivated by thefact thatfor a spicule with complicated 3D motion, the space-time plot, whichis madethrough a slit on a fixed position, could not match the spiculebehavior all thetime and might lose its real life story. By revisiting the same datasets, weidentify and trace 105 and 102 spicules in quiet sun (QS) and coronalhole (CH),respectively, and obtain their statistical dynamic properties. First,we have notfound a single convincing example of 'Type II' spicules. Secondly,more than60% of the identified spicules in each region show a complete cycle,i.e., majorityspicules are 'Type I'. Thirdly, the lifetime of spicules in QS and CHare 148 sand 112 s, respectively, but there is no fundamental lifetimedifference betweenthe spicules in QS and CH reported earlier. Therefore, the suggestionof coronalheating by 'Type II' spicules should be taken with cautions.

Authors: Y. Z. Zhang, K. Shibata, J. X. Wang, X. J. Mao, T. Matsumoto, Y. Liu, and J. T. Su
Projects: Hinode/SOT

Publication Status: Accepted by ApJ on Feb 18, 2012
Last Modified: 2012-02-21 10:24
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