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Interaction between two filaments plays a key role in sympathetic filament eruptions

Two Filaments Interact in Sympathetic Eruptions Key Role
Time–distance diagrams showing the interaction process between F1-R and F2 by using the images from NVST/Hα and SDO/AIA acquired at 304 and 171 Å wavelengths. The diagrams are obtained along the slit "AB" in Figures 3(a1), (b1), and (c1), respectively. In all the panels, the four vertical white dashed lines mark the four moments "07:32 UT," "07:37 UT," "07:47 UT," and "07:52 UT," respectively. The direction of motion of F1-R is indicated by blue lines and F2 by cyan lines. Green labels "Activated(F1-R)" and "Activated(F2)" represent the activation of F1-R and F2, respectively. Credit: The Astrophysical Journal (2023). DOI: 10.3847/1538-4357/aca9d2

Solar sympathetic filament eruptions usually involve two or more filament eruptions that occur simultaneously or successively within a relatively short time interval with a certain causal linkage. The eruption of one filament may have an effect on another one, thus resulting in the eruption of the other filament simultaneously or successively.

Researchers led by Dr. Yang Liping and Prof. Yan Xiaoli from the Yunnan Observatories of the Chinese Academy of Sciences have studied the interaction process between two nearby filaments in the active region NOAA 12866 on September 9, 2021, using data from the 1-m New Vacuum Solar Telescope (NVST) and the Solar Dynamic Observatory (SDO).

The study was published in The Astrophysical Journal on Jan. 25.

They found that the right part of the larger became active first and erupted after appearance of the brightening and bidirectional flows between the larger filament and a near smaller filament. During its process, it continuously approached the smaller filament. Then they collided with each other, and the interaction happened between them. In the following, the brightening and bidirectional flows appeared between them.

"This implies that occurred between the threads of two filaments," said Dr. Yang. The interaction resulted in a rightward motion of the smaller filament at first, and then its activation, and finally a part of it erupted. When the erupted smaller filament deflected rapidly toward the middle part of the larger filament, the left part of the larger filament erupted with its overlying magnetic fields disturbed by the smaller filament.

Furthermore, the researchers found that the two filaments had opposite signs of helicity, and when they collided with each other at a smaller contact angle of less than 45°, the magnetic reconnection between them would happen.

"These successive eruptions occurred in a relatively short time with a certain causal linkage, and their eruptions were caused by filament interaction, which can be called sympathetic eruptions," said Prof. Yan.

This study provides new clues for understanding solar sympathetic eruptions and for studying the continuous explosions of stars or other .

More information: Liping Yang et al, Sympathetic Partial Filament Eruptions Caused by the Interaction between Two Nearby Filaments, The Astrophysical Journal (2023). DOI: 10.3847/1538-4357/aca9d2

Journal information: Astrophysical Journal

Citation: Interaction between two filaments plays a key role in sympathetic filament eruptions (2023, February 3) retrieved 23 March 2023 from
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