Multi-Wavelength Observations of a Failed Filament Eruption and Associated Hovered Coronal Mass Ejection
Abstract
:1. Introduction
2. Data and Observations
3. Solar Limb Event Observed by STEREO-A
3.1. Filament Eruption in EUVI
3.2. Hovered-CME in COR1
4. Solar Disk Observations
4.1. Failed Filament Eruption Observed by SDO
4.1.1. Pre-Eruption Phase (08:42–08:47 UT)
4.1.2. Eruption Phase (08:47–08:57)
4.1.3. Decay Phase (08:57–10:20 UT)
4.2. RHESSI Observations
4.3. Magnetic Topology of the Host Region
4.3.1. Long Term Evolution
4.3.2. Non-Potential Parameters
- (1)
- Magnetic flux (Figure 10a): including positive (), unsigned negative (), and unsigned total magnetic flux (). It is the sum of all pixels where field strength is greater than 20 G. The is a quantitative measure of the effective size of active regions, which provides a physical clue as to the energy available for solar eruptions ([39]);
- (2)
- Magnetic helicity transport rate (Figure 10b): calculating by . Magnetic helicity is a quantitative measurement of the global chiral properties of the magnetic field. It can be transported across the boundary by the passage of helical field lines through the surface (the first term) or by the shuffling horizontal motion of field lines on the surface (the second term) ([40]), since the solar corona is an open volume with the photosphere as a boundary with normal flux. Ref. [41] pointed out that both terms can be calculated with the local correlation tracking method ([42]) from a time series of line-of-sight magnetograms ([43]);
- (3)
- (4)
- (5)
- (red stars in Figure 10d): obtaining from . It quantifies the energy deviation of the coronal magnetic field from its potential state and is regarded as the upper limit of the energy that is available to power the solar eruption.
4.3.3. Decay Index
5. Summary and Conclusions
- In relation to the eruption onset mechanisms is that this eruption is triggered by tether-cutting reconnection. The observational evidence is as follows: 1. even though the slow expansion of the anchored leg occurs earlier than that of the EUV brightening in the core S-shape field, the impulsive eruption is related to the EUV brightening rather than the filament expansion; 2. as the pre-eruption activity, the expansion occurs at the anchored leg, which always fixes on the solar surface during the whole eruption; and 3. the active leg remain stable at the very beginning and then suddenly erupts into the high coronal about two minutes later of the EUV brightening. The disconnection between the active leg and the solar surface means that reconnection should be occurred here; and 4. the EUV brightening first appears at the S-sharped core region which spatio-temporal with the cancellation of opposite magnetic polarities and the hard X-ray emission in the 25–50 KeV energy band, which is due to the non-thermal emission. Both are possible signatures for reconnection occurring under the filament; and 5. no significant untwisted/twisted features are recorded by both STEREO-A and AIA during the eruption. It means that kink instability is not possible to be the triggered. In summary, the above observational results indicate that the eruption is triggered by tether-cutting reconnection.
- Concerning the failure of the eruption, it was confined by the strong corresponding overlying field. The supported observational evidence is as follows: 1. In this study, the active region is an ephemeral region, which emerges in a decaying region with about 22 h before the eruption. Associated with the emergence of the active region, magnetic loops, which are connected to the main bipolar, emerge from the photosphere into the corona gradually. Two J-shaped magnetic structures, which co-spatial with the S-shaped filament, appear just under the magnetic loops; 2. As shown in Figure 5, the erupted filament always remain the arc-shape during its eruption, which presents the strong confine of overlaying magnetic field; 3. The decay index at the apex of the filament is about 0.8–1.2. It is smaller than or comparable with the critical value; 4. Free energy release during the eruption is about erg, which is large enough to power a fully eruption; 5. The maximum accelerated velocity deduced from STEREO-A observation is about 1 km s, which is about 3 times greater than the solar gravitational constant ( km s). All these observational evidences suggest that the eruption failed, possibly due to an inward magnetic tension force.
- The associated coronal counterpart which was recorded as a CME by COR1 is not a real coronal mass ejection. Both limb and disk observations show that there is no coronal plasma ejected from the low atmosphere to the high coronal and even into the interplanetary. More important, the COR1 observation shows that the moving brightening front that is identified as CME stops when it reaches the maximum height of about 2.6. These observations indicate that some CMEs, even recorded by both COR1 and COR2, are only the transient heating and disturbing of coronal rather than really CME.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Zhang, Y.; Tan, B.; Tan, C.; Huang, J.; Yan, Y. Multi-Wavelength Observations of a Failed Filament Eruption and Associated Hovered Coronal Mass Ejection. Universe 2021, 7, 405. https://doi.org/10.3390/universe7110405
Zhang Y, Tan B, Tan C, Huang J, Yan Y. Multi-Wavelength Observations of a Failed Filament Eruption and Associated Hovered Coronal Mass Ejection. Universe. 2021; 7(11):405. https://doi.org/10.3390/universe7110405
Chicago/Turabian StyleZhang, Yin, Baolin Tan, Chengmin Tan, Jing Huang, and Yihua Yan. 2021. "Multi-Wavelength Observations of a Failed Filament Eruption and Associated Hovered Coronal Mass Ejection" Universe 7, no. 11: 405. https://doi.org/10.3390/universe7110405
APA StyleZhang, Y., Tan, B., Tan, C., Huang, J., & Yan, Y. (2021). Multi-Wavelength Observations of a Failed Filament Eruption and Associated Hovered Coronal Mass Ejection. Universe, 7(11), 405. https://doi.org/10.3390/universe7110405