Study of Hα Macrospicules in Coronal Holes: Magnetic Structure and Evolution in Relation to Photospheric Magnetic Setting

Yamauchi, Y.; Wang, H; YC, Jiang; Schwadron, N. A.; Moore, R. L.

doi:10.1086/431664

Cited by 24 publications

(17 citation statements)

References 26 publications

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“…All this strongly supports a possible relationship between some blinkers and macrospicules. The results of Xia et al (2004) on Doppler shifts in macrospicules and Yamauchi et al (2004Yamauchi et al ( , 2005 on macrospicules apparent motions and evolution make us believe that EUV macrospicules have the same behaviour as seen in spicules, i.e. the macrospicules probably propagate upward and then fade away with some of the material falling back towards the solar surface.…”

Section: Resultsmentioning

confidence: 91%

“…The footpoints of the jets are located in the network and their size and duration suggest macrospicule phenomena. Yamauchi et al (2005) described the appearance of macrospicules on the disk showing a few examples from 78 identified macrospicules in images obtained at BBSO in Hα line center, Hα-0.6 Å and Ca ii K line.…”

Section: Resultsmentioning

confidence: 99%

“…The events presented here are jetlike features showing the same behaviour as Hα macrospicules. It is difficult or even impossible for us to resolve loop structures as seen in the Yamauchi et al (2005) data. Xia et al (2005) showed with SUMER data that EUV spicules and macrospicules both show blue and red-shifted emission when seen rising from the solar surface.…”

Section: Resultsmentioning

confidence: 99%

“…Following the identification of macrospicules in EUV He ii 304 Å, Moore et al (1977) reported their counterpart in the Hα line. Recently, Yamauchi et al (2004Yamauchi et al ( , 2005 revealed that Hα macrospicules show two different types of structure: spiked jet (83% of the studied events) and an eruptive loop (10%), suggesting a different formation mechanism.…”

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confidence: 99%

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Macrospicules and blinkers as seen in Shutterless EIT 304 Å

Madjarska¹,

Doyle²,

Hochedez³

et al. 2006

A&A

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Aims. Small-scale transient phenomena in the solar atmosphere are believed to play a crucial role in the coronal heating and solar wind generation. This study aims at providing new observational evidence on blinkers and macrospicules appearance in imager data and in doing so, establish the long disputed relationship between these phenomena.Methods. We analyse unique high-cadence images in the transition region He ii 304 Å line obtained in a shutterless mode of the Extreme-ultraviolet Imaging Telescope on board the Solar and Heliospheric Observatory. The data have a cadence of approximately 68 s and a pixel size of 2.62 arcsec. The events are identified through an automatic brightenings identification procedure.Features showing a jet-like structure seen in projection on the disk were selected and their light-curve further analysed. Results. The temporal evolution of the intensity in three events is shown, two of them seen on-disk as jet-like features and one above the limb. The flux increase, size and duration derived from the light-curve of the on-disk events show an identity with the blinker phenomenon. Conclusions. The light curves of these events suggest that the off-limb and on-disk features are in fact one and the same phenomenon and therefore that some blinkers are the on-disk counterparts of macrospicules.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Macrospicules and blinkers as seen in Shutterless EIT 304 Å

Madjarska¹,

Doyle²,

Hochedez³

et al. 2006

A&A

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“…Yamauchi et al (2005) have studied the eruptions of minifilaments, running nearly parallel to the neutral lines and crossing them with small angles, in a CH. A filament erupted and rose to a high level where its top was invisible.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Response of the solar atmosphere to magnetic field evolution in a coronal hole region

Yang

Zhang

Jin

et al. 2009

A&A

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Context. Coronal holes (CHs) are deemed to be the sources of the fast solar wind streams that lead to recurrent geomagnetic storms and have been intensively investigated, but not all the properties of them are well known. Aims. We study the response of the solar atmosphere to the magnetic field evolution in a CH region, such as magnetic flux emergence and cancellation for both network (NT) and intranetwork (IN) regions. Methods. We study an equatorial CH observed simultaneously by HINODE and STEREO on July 27, 2007. The HINODE/SP maps are adopted to derive the physical parameters of the photosphere and to investigate the magnetic field evolution and distribution. The G band and Ca ii H images with high tempo-spatial resolution from HINODE/BFI and the multi-wavelength data from STEREO/EUVI are utilized to study the corresponding atmospheric response of different overlying layers. Results. We explore an emerging dipole located at the CH boundary. Mini-scale arch filaments (AFs) accompanying the emerging dipole were observed with the Ca ii H line. During the separation of the dipolar footpoints, three AFs appeared and expanded in turn.The first AF divided into two segments in its late stage, while the second and third AFs erupted in their late stages. The lifetimes of these three AFs are 4, 6, 10 min, and the two intervals between the three divisions or eruptions are 18 and 12 min, respectively. We display an example of mixed-polarity flux emergence of IN fields within the CH and present the corresponding chromospheric response. With the increase of the integrated magnetic flux, the brightness of the Ca ii H images exhibits an increasing trend. We also study magnetic flux cancellations of NT fields located at the CH boundary and present the chromospheric and coronal response. We notice that the brighter regions seen in the 171 Å images are relevant to the interacting magnetic elements. By examining the magnetic NT and IN elements and the response of different atmospheric layers, we obtain close positive linear correlations between the NT magnetic flux densities and the brightness of both G band (correlation coefficient 0.85) and Ca ii H (correlation coefficient 0.58).

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Formation of a White-Light Jet Within a Quadrupolar Magnetic Configuration

Filippov¹,

Koutchmy²,

Tavabi³

2011

The PROBA2 Mission

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Abstract. We analyze multi-wavelength and multi-viewpoint observations of a large-scale event viewed on 7 April 2011 originating from an active region complex. The activity leads to a whitelight jet being formed in the outer corona. The topology and evolution of the coronal structures were imaged in high resolution using the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO). In addition, large field-of-view images of the corona were obtained using the Sun Watcher using Active Pixel System detector and Image Processing (SWAP) telescope onboard the PRoject for Onboard Autonomy (PROBA2) microsatellite, providing evidence for the connectivity of the coronal structures with outer coronal features that were imaged with the Large Angle Spectrometric Coronagraph (LASCO) C2 on Solar and Heliospheric Observatory (SOHO). The data-sets reveal an Eiffel-tower type jet configuration extending into a narrow jet in the outer corona. The event starts from the growth of a dark area in the central part of the structure. The darkening was also observed in projection on the disk by the Solar TErrestrial RElations Observatory-Ahead (STEREO-A) spacecraft from a different point of view. We assume that the dark volume in the corona descends from a coronal cavity of a flux rope that moved up higher in the corona but still failed to erupt. The quadrupolar magnetic configuration corresponds to a saddle-like shape of the dark volume and provides a possibility for the plasma to escape along the open field lines into the outer corona, forming the white-light jet.

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Study of Hα Macrospicules in Coronal Holes: Magnetic Structure and Evolution in Relation to Photospheric Magnetic Setting

Cited by 24 publications

References 26 publications

Macrospicules and blinkers as seen in Shutterless EIT 304 Å

Macrospicules and blinkers as seen in Shutterless EIT 304 Å

Response of the solar atmosphere to magnetic field evolution in a coronal hole region

Formation of a White-Light Jet Within a Quadrupolar Magnetic Configuration

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