Solar Ultraviolet Bursts in the Joint Footpoints of Multiple Transition Region Loops
Solar Ultraviolet bursts (UBs) associated with flux emergence are expected to help understand the physical processes of the flux emergence itself. In the present study, we analyse imaging and spectroscopic observations of a special group of UBs (including twelve of them) occurring in the joint footp...
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MDPI AG
2021-07-01
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| Series: | Symmetry |
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| Online Access: | https://www.mdpi.com/2073-8994/13/8/1390 |
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| author | Zhenyong Hou Zhenghua Huang Lidong Xia Hui Fu Youqian Qi Dayang Liu Ning Tang |
| author_facet | Zhenyong Hou Zhenghua Huang Lidong Xia Hui Fu Youqian Qi Dayang Liu Ning Tang |
| author_sort | Zhenyong Hou |
| collection | DOAJ |
| description | Solar Ultraviolet bursts (UBs) associated with flux emergence are expected to help understand the physical processes of the flux emergence itself. In the present study, we analyse imaging and spectroscopic observations of a special group of UBs (including twelve of them) occurring in the joint footpoint regions of multiple transition region loops above the flux emerging regions. Consistent with previous studies of common UBs, we found that the spectral characteristics of this group of UBs are varied. Our results show that the responses of UBs in Ni <span style="font-variant: small-caps;">ii</span>, NUV continuum, Mg <span style="font-variant: small-caps;">ii</span> h and O <span style="font-variant: small-caps;">i</span> are originated from locations differ from that emits Si <span style="font-variant: small-caps;">iv</span>. The imaging data show that UBs have connections with the dynamics in the transition region loops. Brightenings starting from UB-regions and propagating along loops can be seen in SJ 1400/1330 Å and AIA 304 Å images and the corresponding time-space images. The apparent velocities are tens of kilometers per second in AIA 304 Å. For symmetry, the brightenings can propagate from the UB-regions towards opposite directions with similar apparent velocities in some cases. Given that these UBs are magnetic reconnection phenomena, we suggest that the propagating brightenings are the signals of the plasma flows resulted from heatings in the UB-regions. |
| first_indexed | 2024-03-10T08:20:47Z |
| format | Article |
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| institution | Directory Open Access Journal |
| issn | 2073-8994 |
| language | English |
| last_indexed | 2024-03-10T08:20:47Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Symmetry |
| spelling | doaj.art-b7bb8f0be7e8466a84caec30ae474c042023-11-22T10:00:39ZengMDPI AGSymmetry2073-89942021-07-01138139010.3390/sym13081390Solar Ultraviolet Bursts in the Joint Footpoints of Multiple Transition Region LoopsZhenyong Hou0Zhenghua Huang1Lidong Xia2Hui Fu3Youqian Qi4Dayang Liu5Ning Tang6Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, ChinaShandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, ChinaShandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, ChinaShandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, ChinaShandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, ChinaShandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, ChinaShandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, ChinaSolar Ultraviolet bursts (UBs) associated with flux emergence are expected to help understand the physical processes of the flux emergence itself. In the present study, we analyse imaging and spectroscopic observations of a special group of UBs (including twelve of them) occurring in the joint footpoint regions of multiple transition region loops above the flux emerging regions. Consistent with previous studies of common UBs, we found that the spectral characteristics of this group of UBs are varied. Our results show that the responses of UBs in Ni <span style="font-variant: small-caps;">ii</span>, NUV continuum, Mg <span style="font-variant: small-caps;">ii</span> h and O <span style="font-variant: small-caps;">i</span> are originated from locations differ from that emits Si <span style="font-variant: small-caps;">iv</span>. The imaging data show that UBs have connections with the dynamics in the transition region loops. Brightenings starting from UB-regions and propagating along loops can be seen in SJ 1400/1330 Å and AIA 304 Å images and the corresponding time-space images. The apparent velocities are tens of kilometers per second in AIA 304 Å. For symmetry, the brightenings can propagate from the UB-regions towards opposite directions with similar apparent velocities in some cases. Given that these UBs are magnetic reconnection phenomena, we suggest that the propagating brightenings are the signals of the plasma flows resulted from heatings in the UB-regions.https://www.mdpi.com/2073-8994/13/8/1390sun: atmospheresun: chromospheresun: transition regionsun: uv radiationmethods: observational |
| spellingShingle | Zhenyong Hou Zhenghua Huang Lidong Xia Hui Fu Youqian Qi Dayang Liu Ning Tang Solar Ultraviolet Bursts in the Joint Footpoints of Multiple Transition Region Loops Symmetry sun: atmosphere sun: chromosphere sun: transition region sun: uv radiation methods: observational |
| title | Solar Ultraviolet Bursts in the Joint Footpoints of Multiple Transition Region Loops |
| title_full | Solar Ultraviolet Bursts in the Joint Footpoints of Multiple Transition Region Loops |
| title_fullStr | Solar Ultraviolet Bursts in the Joint Footpoints of Multiple Transition Region Loops |
| title_full_unstemmed | Solar Ultraviolet Bursts in the Joint Footpoints of Multiple Transition Region Loops |
| title_short | Solar Ultraviolet Bursts in the Joint Footpoints of Multiple Transition Region Loops |
| title_sort | solar ultraviolet bursts in the joint footpoints of multiple transition region loops |
| topic | sun: atmosphere sun: chromosphere sun: transition region sun: uv radiation methods: observational |
| url | https://www.mdpi.com/2073-8994/13/8/1390 |
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