2012
DOI: 10.4236/jmp.2012.311223
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Abstract: One of the important parameters of the ubiquitous spicules rising intermittently above the surface of the Sun is the variation of spicule spline orientation with respect to the solar coordinates, presumably reflecting the focusing of ejection by the coronal magnetic field. Here we first use a method of tracing limb spicules using a combination of second derivative operators in multiple directions around each pixel to enhance the visibility of fine linear part of spicules. Furthermore, the Hough transform is us… Show more

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Cited by 5 publications
(6 citation statements)
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“…It is tempting to make the connection with the LEB, knowing that the Doppler shift value is about 100 km s -1 and the opposite wing shift similar in two split components, without taking into account the LOS effect. These values of LOS velocities could be corrected using the mean value of spicule inclination in polar regions in case we identify these components with spicules; the average tilt angle of spicules in polar areas is of order of 30 degrees or less (Tavabi, Koutchmy, and Ajabshirizadeh 2012) such that the corrected value would increase drastically by a rather large factor. Bidirectional jets in such events are accelerated in opposite directions from the reconnection sites, the first approximation X null-point reconnection geometry could imply the involvement of magnetic loops, separatrix surfaces, and spine (see e.g.…”
Section: Discussionmentioning
confidence: 99%
“…It is tempting to make the connection with the LEB, knowing that the Doppler shift value is about 100 km s -1 and the opposite wing shift similar in two split components, without taking into account the LOS effect. These values of LOS velocities could be corrected using the mean value of spicule inclination in polar regions in case we identify these components with spicules; the average tilt angle of spicules in polar areas is of order of 30 degrees or less (Tavabi, Koutchmy, and Ajabshirizadeh 2012) such that the corrected value would increase drastically by a rather large factor. Bidirectional jets in such events are accelerated in opposite directions from the reconnection sites, the first approximation X null-point reconnection geometry could imply the involvement of magnetic loops, separatrix surfaces, and spine (see e.g.…”
Section: Discussionmentioning
confidence: 99%
“…We suggest that such spicules have a multi-component structure and are created due to the disruption of a primary loop (Tavabi, Koutchmy & Ajabshirizadeh 2011b). In the polar regions spicules are longer and less tilted (Tavabi, Koutchmy & Ajabshirizadeh 2012), so the probability of observing individual spicules increases. Also, the lower density of the background in the polar regions helps us to better see spicule foot-points.…”
Section: Discussionmentioning
confidence: 99%
“…This is obtained using the mad-max algorithm (Koutchmy & Koutchmy 1989;Tavabi et al 2012Tavabi et al , 2013); see Fig. 1 for a sample.…”
Section: Observationsmentioning
confidence: 99%
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