Limb Event Brightenings and Fast Ejection Using IRIS Mission Observations
International audience The Interface Region Imaging Spectrograph (IRIS) of the recently commissioned 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 been a...
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ftinsu:oai:HAL:insu-03644709v1 2024-04-14T08:19:49+00:00 Limb Event Brightenings and Fast Ejection Using IRIS Mission Observations Tavabi, E. Koutchmy, S. Golub, L. Institut d'Astrophysique de Paris (IAP) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) 2015 https://insu.hal.science/insu-03644709 https://doi.org/10.1007/s11207-015-0771-3 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/arxiv/1507.06794 info:eu-repo/semantics/altIdentifier/doi/10.1007/s11207-015-0771-3 insu-03644709 https://insu.hal.science/insu-03644709 ARXIV: 1507.06794 BIBCODE: 2015SoPh.290.2871T doi:10.1007/s11207-015-0771-3 SOLAR PHYSICS https://insu.hal.science/insu-03644709 SOLAR PHYSICS, 2015, 290, pp.2871-2887. ⟨10.1007/s11207-015-0771-3⟩ Explosive event Macrospicule Jet Magnetic reconnection Multi-directional ejection Astrophysics - Solar and Stellar Astrophysics [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2015 ftinsu https://doi.org/10.1007/s11207-015-0771-3 2024-03-21T17:16:00Z International audience The Interface Region Imaging Spectrograph (IRIS) of the recently commissioned 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 been available ever before. High temporal, spatial (0.3'') and spectral resolution observations from the ultraviolet IRIS spectra near the solar limb reveal high-energy limb event brightenings (LEBs) at low chromospheric heights at about 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 that were identified as macrospicules on slit-jaw (SJ) images in Si iv and He ii 304 Å. The events were analyzed from a sequence of very close rasters taken near the central meridian and the South Pole limb. We analyzed the processed SJ images and the simultaneously observed fast spectral sequences, which have large Doppler shifts, with a pair of redshifted elements together with a faster blueshifted element from almost the same position. Shifts correspond to velocities of up to 100 km s^{-1} in projection on the plane of the sky. Erupting spicules and macrospicules from these regions are visible in images taken before and after the spectra. The cool low first ionization potential (FIP) element simultaneous line emissions of the Mg ii h and k resonance lines do not clearly show a similar signature because of optical thickness effects, but the Si iv broadband SJ images do. The bidirectional plasma jets ejected from a small reconnection site are interpreted to be the result of coronal loop-loop interactions that lead to reconnection in nearby sites. Article in Journal/Newspaper South pole Institut national des sciences de l'Univers: HAL-INSU South Pole Solar Physics 290 10 2871 2887 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Explosive event Macrospicule Jet Magnetic reconnection Multi-directional ejection Astrophysics - Solar and Stellar Astrophysics [SDU]Sciences of the Universe [physics] |
spellingShingle |
Explosive event Macrospicule Jet Magnetic reconnection Multi-directional ejection Astrophysics - Solar and Stellar Astrophysics [SDU]Sciences of the Universe [physics] Tavabi, E. Koutchmy, S. Golub, L. Limb Event Brightenings and Fast Ejection Using IRIS Mission Observations |
topic_facet |
Explosive event Macrospicule Jet Magnetic reconnection Multi-directional ejection Astrophysics - Solar and Stellar Astrophysics [SDU]Sciences of the Universe [physics] |
description |
International audience The Interface Region Imaging Spectrograph (IRIS) of the recently commissioned 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 been available ever before. High temporal, spatial (0.3'') and spectral resolution observations from the ultraviolet IRIS spectra near the solar limb reveal high-energy limb event brightenings (LEBs) at low chromospheric heights at about 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 that were identified as macrospicules on slit-jaw (SJ) images in Si iv and He ii 304 Å. The events were analyzed from a sequence of very close rasters taken near the central meridian and the South Pole limb. We analyzed the processed SJ images and the simultaneously observed fast spectral sequences, which have large Doppler shifts, with a pair of redshifted elements together with a faster blueshifted element from almost the same position. Shifts correspond to velocities of up to 100 km s^{-1} in projection on the plane of the sky. Erupting spicules and macrospicules from these regions are visible in images taken before and after the spectra. The cool low first ionization potential (FIP) element simultaneous line emissions of the Mg ii h and k resonance lines do not clearly show a similar signature because of optical thickness effects, but the Si iv broadband SJ images do. The bidirectional plasma jets ejected from a small reconnection site are interpreted to be the result of coronal loop-loop interactions that lead to reconnection in nearby sites. |
author2 |
Institut d'Astrophysique de Paris (IAP) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
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 |
HAL CCSD |
publishDate |
2015 |
url |
https://insu.hal.science/insu-03644709 https://doi.org/10.1007/s11207-015-0771-3 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
SOLAR PHYSICS https://insu.hal.science/insu-03644709 SOLAR PHYSICS, 2015, 290, pp.2871-2887. ⟨10.1007/s11207-015-0771-3⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/arxiv/1507.06794 info:eu-repo/semantics/altIdentifier/doi/10.1007/s11207-015-0771-3 insu-03644709 https://insu.hal.science/insu-03644709 ARXIV: 1507.06794 BIBCODE: 2015SoPh.290.2871T doi:10.1007/s11207-015-0771-3 |
op_doi |
https://doi.org/10.1007/s11207-015-0771-3 |
container_title |
Solar Physics |
container_volume |
290 |
container_issue |
10 |
container_start_page |
2871 |
op_container_end_page |
2887 |
_version_ |
1796297925271224320 |