Limb Event Brightenings and Fast Ejection Using IRIS Mission Observations
The Interface Region Imaging Spectrograph (IRIS) of the NASA small explorer mission provides significantly more complete and higher resolution spectral coverage of the dynamical conditions inside the chromosphere and transition region (TR) than has heretofore been available. Near the solar limb high...
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ftdatacite:10.48550/arxiv.1507.06794 2023-05-15T18:23:14+02:00 Limb Event Brightenings and Fast Ejection Using IRIS Mission Observations Tavabi, E. Koutchmy, S. Golub, L. 2015 https://dx.doi.org/10.48550/arxiv.1507.06794 https://arxiv.org/abs/1507.06794 unknown arXiv https://dx.doi.org/10.1007/s11207-015-0771-3 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences article-journal Article ScholarlyArticle Text 2015 ftdatacite https://doi.org/10.48550/arxiv.1507.06794 https://doi.org/10.1007/s11207-015-0771-3 2022-04-01T12:09:46Z The Interface Region Imaging Spectrograph (IRIS) of the NASA small explorer mission provides significantly more complete and higher resolution spectral coverage of the dynamical conditions inside the chromosphere and transition region (TR) than has heretofore been available. Near the solar limb high temporal, spatial (0.3") and spectral resolution observations from the ultraviolet IRIS spectra reveal high-energy limb event brightenings (LEBs) at low chromospheric heights, around 1 Mm above the limb. They can be characterized as explosive events producing jets. We selected two events showing spectra of a confined eruption just off or near the quiet Sun limb, the jet part showing obvious moving material with short duration large Doppler shifts in three directions identified as macrospicules on slit-jaw (SJ) images in Si IV and He II 304 A. The events are analyzed from a sequence of very close rasters taken near the central meridian and the South pole limb. The processed SJ images and the simultaneously observed fast spectral sequences having large Doppler shifts, with a pair of red shifted elements together with a faster blue shifted element from almost the same position, are analyzed. Shifts correspond to velocities of up to 100 km/s in projection on the plane of the sky. The occurrence of erupting spicules and macrospicules from these regions is noticed from images taken before and after the spectra. The cool low first ionization potential (FIP) element simultaneous line emissions of the MgII h and k resonance lines do not clearly show a similar signature due to optical thickness effects but the Si IV broad-band SJ images do. The bidirectional plasma jets ejected from a small reconnection site are interpreted as the result of coronal loop-loop interactions leading to reconnection in nearby sites. : 24 pages, 16 figures., Accepted in Sol. Phys Text South pole DataCite Metadata Store (German National Library of Science and Technology) South Pole |
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Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences |
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Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences Tavabi, E. Koutchmy, S. Golub, L. Limb Event Brightenings and Fast Ejection Using IRIS Mission Observations |
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Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences |
description |
The Interface Region Imaging Spectrograph (IRIS) of the NASA small explorer mission provides significantly more complete and higher resolution spectral coverage of the dynamical conditions inside the chromosphere and transition region (TR) than has heretofore been available. Near the solar limb high temporal, spatial (0.3") and spectral resolution observations from the ultraviolet IRIS spectra reveal high-energy limb event brightenings (LEBs) at low chromospheric heights, around 1 Mm above the limb. They can be characterized as explosive events producing jets. We selected two events showing spectra of a confined eruption just off or near the quiet Sun limb, the jet part showing obvious moving material with short duration large Doppler shifts in three directions identified as macrospicules on slit-jaw (SJ) images in Si IV and He II 304 A. The events are analyzed from a sequence of very close rasters taken near the central meridian and the South pole limb. The processed SJ images and the simultaneously observed fast spectral sequences having large Doppler shifts, with a pair of red shifted elements together with a faster blue shifted element from almost the same position, are analyzed. Shifts correspond to velocities of up to 100 km/s in projection on the plane of the sky. The occurrence of erupting spicules and macrospicules from these regions is noticed from images taken before and after the spectra. The cool low first ionization potential (FIP) element simultaneous line emissions of the MgII h and k resonance lines do not clearly show a similar signature due to optical thickness effects but the Si IV broad-band SJ images do. The bidirectional plasma jets ejected from a small reconnection site are interpreted as the result of coronal loop-loop interactions leading to reconnection in nearby sites. : 24 pages, 16 figures., Accepted in Sol. Phys |
format |
Text |
author |
Tavabi, E. Koutchmy, S. Golub, L. |
author_facet |
Tavabi, E. Koutchmy, S. Golub, L. |
author_sort |
Tavabi, E. |
title |
Limb Event Brightenings and Fast Ejection Using IRIS Mission Observations |
title_short |
Limb Event Brightenings and Fast Ejection Using IRIS Mission Observations |
title_full |
Limb Event Brightenings and Fast Ejection Using IRIS Mission Observations |
title_fullStr |
Limb Event Brightenings and Fast Ejection Using IRIS Mission Observations |
title_full_unstemmed |
Limb Event Brightenings and Fast Ejection Using IRIS Mission Observations |
title_sort |
limb event brightenings and fast ejection using iris mission observations |
publisher |
arXiv |
publishDate |
2015 |
url |
https://dx.doi.org/10.48550/arxiv.1507.06794 https://arxiv.org/abs/1507.06794 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://dx.doi.org/10.1007/s11207-015-0771-3 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1507.06794 https://doi.org/10.1007/s11207-015-0771-3 |
_version_ |
1766202780927655936 |