Observations of a rotating macrospicule associated with an X-ray jet

Kamio, S.; Curdt, W.; Teriaca, L.; Inhester, B.; Solanki, S. K.

doi:10.1051/0004-6361/200913269

Cited by 72 publications

(84 citation statements)

References 28 publications

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“…Our recent multi-instrument analysis of a "classical" X-ray jet has clearly demonstrated that X-ray jets are strongly visible in the He ii emission (Madjarska 2011). We believe that this is also the case of the event described by Kamio et al (2010). Equally, spicules are prominent in these spectral lines.…”

Section: Discussionmentioning

confidence: 68%

“…Spectral and imaging macrospicule analysis were reported in several papers (Pike & Harrison 1997;Parenti et al 2002;Pike & Mason 2002;Kamio et al 2010). In SoHO/CDS data, they were registered in spectral lines with formation temperatures from 20 000 K to 1 MK (Pike & Harrison 1997), although Pike & Mason (2002) The X-ray jet was associated with tall spicules seen in images from the Solar Optical Telescope (SOT) taken with the Ca ii H filter and identified as type II spicules.…”

Section: Introductionmentioning

confidence: 99%

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Can coronal hole spicules reach coronal temperatures?

Madjarska

Vanninathan

Doyle

2011

A&A

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Aims. The present study aims to provide observational evidence of whether coronal hole spicules reach coronal temperatures. Methods. We combine multi-instrument co-observations obtained with the SUMER/SoHO and with the EIS/SOT/XRT/Hinode. Results. The analysed three large spicules were found to be comprised of numerous thin spicules that rise, rotate, and descend simultaneously forming a bush-like feature. Their rotation resembles the untwisting of a large flux rope. They show velocities ranging from 50 to 250 km s −1 . We clearly associated the red-and blue-shifted emissions in transition region lines not only with rotating but also with rising and descending plasmas. Our main result is that these spicules although very large and dynamic, are not present in the spectral lines formed at temperatures above 300 000 K.Conclusions. In this paper we present the analysis of three Ca ii H large spicules that are composed of numerous dynamic thin spicules but appear as macrospicules in lower resolution EUV images. We found no coronal counterpart of these and smaller spicules. We believe that the identification of phenomena that have very different origins as macrospicules is due to the interpretation of the transition region emission, and especially the He ii emission, wherein both chromospheric large spicules and coronal X-ray jets are present. We suggest that the recent observation of spicules in the coronal AIA/SDO 171 Å and 211 Å channels probably comes from the existence of transition region emission there.

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Section: Discussionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Can coronal hole spicules reach coronal temperatures?

Madjarska

Vanninathan

Doyle

2011

A&A

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“…The double peak in the emission of EE1 and EE2 may also be an effect of the spinning motion if we assume the repetition of a brightness maximum after completing a full revolution after ≈200 s. Alternatively, the double-peaked lightcurve may have something to do with the occurrence of double-threaded jets that have been reported from XRT observations (Kamio et al 2010).…”

Section: Discussionmentioning

confidence: 95%

“…Tian et al (2008) found that the Doppler shift pattern of a coronal bright point (BP) gradually varies with height, suggesting that the magnetic loops associated with the BP are twisted or in helical form. Recently Kamio et al (2010) communicated the observation of an X-ray jet with helical motion at TR temperatures observed by the two spectrometers Hinode-EIS and SoHO-SUMER. Nisticó et al (2009) report in their survey of STEREO-EUVI jets that 31 out of 79 events exhibit helical motion, and furthermore mention the possibility that the others were very narrow so that it is possible that they were unable to resolve the twist.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic evidence for helicity in explosive events

Curdt

Tian

2011

A&A

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Aims. 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 but spinning narrow spicule-like structures. Methods. Our spectra of textbook explosive events with simultaneous Doppler flow of a red and a blue component are extreme cases of high spectroscopic 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 alternative interpretation of redshift and blueshift as a 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 for this. 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, which is admittedly not easily detectable by imagers. Despite of this difficulty, evidence of helicity in spicules has been reported in the literature. This led 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. Results. We arrive at a concept that supports the idea that explosive events and spicules are different manifestations of the same helicity-driven scenario. In contrast to the conventional view of explosive events as linear bidirectional jets that are triggered by a reconnection event in the transition region, this new interpretation is compatible with the observational results. Consequently, in this case a photospheric or subphotospheric trigger has to be assumed. Conclusions. We suggest that explosive events/spicules are to be compared to the unwinding of a loaded torsional spring.

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“…Kamio et al 2007Kamio et al , 2010Patsourakos et al 2008;Nisticò et al 2009;Filippov et al 2009;Liu et al 2009Liu et al , 2011Shen et al 2011;Yang et al 2011;Morton et al 2012a;Chen et al 2012) and estimates for the plasma parameters (Culhane et al 2007;Doschek et al 2010;He et al 2010a;Madjarska 2011;Nisticò et al 2011). In brief, the observations tend to show the jets as an inverted-Y shape, consisting of a collimated ejection that forms the spire Movies are available in electronic form at http://www.aanda.org and with a number of heated loop structures seen at the base.…”

Section: Introductionmentioning

confidence: 99%

The dynamical behaviour of a jet in an on-disk coronal hole observed with AIA/SDO

Chandrashekhar

Morton

Banerjee

et al. 2014

A&A

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Aims. Extreme ultraviolet (EUV) jets situated in coronal holes are thought to play an important role in supplying heated material to the corona and solar wind. The multi-wavelength capabilities and high signal-to-noise ratio of detectors on board the Solar Dynamic Observatory (SDO) allow for detailed study of these jets' evolution. We aim to exploit SDO's capabilities to reveal information on the jet dynamics and to obtain estimates for plasma properties associated with the jets. Methods. We studied the dynamics of an EUV jet with SDO at a coronal hole boundary. The details of the jet evolution are discussed and measurements of the jet's parameters, e.g. length, width, life time, and outward speed, are obtained. Furthermore, automated emission measure analysis is exploited to determine estimates for the temperature and density of the jet. A propagating transverse wave supported by the jet spire is also observed. Measurements of the wave properties are exploited for magneto-seismology and are used in conjunction with the emission measure results to estimate the magnetic field strength of the jet.Results. We present a detailed description of the jet's evolution, with new evidence of plasma flows, prior to the jet's initiation, along the loops at the base of the jet and also find further evidence that flows along the jet spire consist of multiple, quasi-periodic smallscale plasma ejection events. In addition, spectroscopic analysis reveal that the jet has temperatures of log 5.89 ± 0.08 K and electron densities of log 8.75 ± 0.05 cm −3 . Measured properties of the transverse wave provide evidence that a strong damping of the wave occurs as it propagates along the jet spire with speeds of ∼110 km s −1 . The magneto-seismological inversion of the wave parameters provides values of B = 1.21 ± 0.2 G along the jet spire, which is in line with previous estimates for open fields in coronal holes.

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Observations of a rotating macrospicule associated with an X-ray jet

Cited by 72 publications

References 28 publications

Can coronal hole spicules reach coronal temperatures?

Can coronal hole spicules reach coronal temperatures?

Spectroscopic evidence for helicity in explosive events

The dynamical behaviour of a jet in an on-disk coronal hole observed with AIA/SDO

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