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Spectroscopic evidence for helicity in explosive events | | Werner Curdt
; Hui Tian
; | | Date: |
11 Jul 2011 | | Abstract: | We report spectroscopic observations in support of a novel view of transition
region explosive events, observations that lend empirical evidence that at
least in some cases explosive events may be nothing else than spinning narrow
spicule-like structures. Our spectra of textbook explosive events with
simultaneous Doppler flow of a red and of a blue component are extreme cases of
high spectro-scopic velocities that lack apparent motion, to be expected if
interpreted as a pair of collimated, linearly moving jets. The awareness of
this conflict led us to the alternate interpretation of redshift and blueshift
as spinning motion of a small plasma volume. In contrast to the bidirectional
jet scenario, a small volume of spinning plasma would be fully compatible with
the observation of flows without detectable apparent motion. We suspect that
these small volumes could be spicule-like structures and try to find evidence.
We show observations of helical motion in macrospicules and argue that these
features - if scaled down to a radius comparable to the slit size of a
spectrometer - should have a spectroscopic signature similar to that observed
in explosive events, while not easily detectable by imagers. Despite of this
difficulty, evidence of helicity in spicules has been reported in the
literature. This inspired us to the new insight that the same narrow spinning
structures may be the drivers in both cases, structures that imagers observe as
spicules and that in spectrometers cross the slit and are seen as explosive
events. We arrive at a concept that supports the idea that explosive events and
spicules are different manifestations of the same helicity driven scenario.
Consequently, in such a case, a photospheric or subphotosperic trigger has to
be assumed. | | Source: | arXiv, 1107.1969 | | Services: | Forum | Review | PDF | Favorites | |
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