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 |
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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 |
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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 |