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http://hdl.handle.net/2248/4856
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DC Field | Value | Language |
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dc.contributor.author | Scullion, E | - |
dc.contributor.author | Popescu, M. D | - |
dc.contributor.author | Banerjee, D | - |
dc.contributor.author | Doyle, J. G | - |
dc.contributor.author | Erdelyi, R | - |
dc.date.accessioned | 2009-10-09T17:23:39Z | - |
dc.date.available | 2009-10-09T17:23:39Z | - |
dc.date.issued | 2009-10-20 | - |
dc.identifier.citation | The Astrophysical Journal, Vol. 704, pp. 1385 - 1395 | - |
dc.identifier.other | doi:10.1088/0004-637X/704/2/1385 | - |
dc.identifier.uri | http://hdl.handle.net/2248/4856 | - |
dc.description | Open Access | en |
dc.description.abstract | Here, we explore the nature of small-scale jet-like structures and their possible relation to explosive events and other known transient features, like spicules and macrospicules, using high-resolution spectroscopy obtained with the Solar and Heliospheric Observatory/Solar Ultraviolet Measurements of Emitted Radiation instrument. We present a highly resolved spectroscopic analysis and line parameter study of time-series data for jets occurring on-disk and off-limb in both a northern and a southern coronal hole. The analysis reveals many small-scale transients which rapidly propagate between the mid-transition region (N IV 765 Å line formation: 140,000 K) and the lower corona (Ne VIII 770 Å line formation: 630,000 K). In one example, a strong jet-like event is associated with a cool feature not present in the Ne VIII 770 Å line radiance or Doppler velocity maps. Another similar event is observed, but with a hot component, which could be perceived as a blinker. Our data reveal fast, repetitive plasma outflows with blueshift velocities of ≈145 km s–1 in the lower solar atmosphere. The data suggest a strong role for smaller jets (spicules), as a precursor to macrospicule formation, which may have a common origin with explosive events. | en |
dc.language.iso | en_US | en |
dc.publisher | IOP Publishing | en |
dc.relation.uri | http://www.iop.org/EJ/abstract/0004-637X/704/2/1385 | en |
dc.rights | © The American Astronomical Society | - |
dc.subject | Line: Profiles | en |
dc.subject | Sun: Chromosphere | en |
dc.subject | Sun: Transition Region | - |
dc.subject | Sun: UV Radiation | - |
dc.subject | Techniques: Spectroscopic | - |
dc.title | Jets in polar coronal holes | en |
dc.type | Article | en |
Appears in Collections: | IIAP Publications |
Files in This Item:
File | Description | Size | Format | |
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Jets in polar coronal holes | Open Access | 1.88 MB | Adobe PDF | View/Open |
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