Sunspots are essentially the most noticeable manifestation of solar magnetic area concentrations within the photosphere. A typical mature sunspot has an umbra and a penumbra. Mild bridges (LBs) are the strip-like vivid options, two ends of which join the penumbra and span the umbra of a sunspot.
Generally, the looks of sunshine bridges is a sign of sunspot decay or fragmentation. The evolution of sunspots is carefully associated to solar eruptions, e.g., solar flares, coronal mass ejections, and filament eruptions. Nevertheless, to this point, the formation and decay mechanisms of sunspots have been poorly understood.
Researchers led by Prof. Yan Xiaoli from Yunnan Observatories of the Chinese language Academy of Sciences (CAS) and Li Qiaoling from Yunnan College analyzed the decay strategy of a sunspot in lively area NOAA 12680 on the sun by utilizing the stray light calibrated information from the Photo voltaic Dynamics Observatory/Helioseismic and Magnetic Imaging (SDO/HMI), and mentioned the affect of the sunshine bridge on a decaying sunspot.
The outcomes have been revealed in The Astrophysical Journal on Jan. 11.
The researchers discovered that originally of sunspot decay, some elongated darkish buildings have been step by step separated from the umbra. The depth, vertical area energy and magnetic inclination of those darkish buildings have been between these of the umbra and penumbra. With the formation of a light-weight bridge, the total magnetic flux of the entire penumbra area step by step decreased, and a part of the penumbra situated on one facet of the sunshine bridge quickly disappeared.
As well as, after the looks of an outward movement of magnetic flux alongside the sunshine bridge, the decay fee of the realm and magnetic flux of the penumbral sector quickly deceased. These outcomes steered that the fast decay of the penumbral sector was correlated with the sunshine bridge.
“The darkish construction within the penumbra and the formation of sunshine bridge could also be the results of magnetic flux spreading out from the umbra, which can speed up the decay of the sunspot,” mentioned Prof. Yan.
Extra info:
Qiaoling Li et al, Fast Decay of a Penumbral Sector Related to a Robust Mild Bridge in Energetic Area NOAA 12680, The Astrophysical Journal (2023). DOI: 10.3847/1538-4357/aca667
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Chinese Academy of Sciences
Quotation:
Researchers discover potential mechanism of solar mild bridge formation and penumbra disappearance (2023, January 18)
retrieved 18 January 2023
from https://phys.org/information/2023-01-potential-mechanism-solar-bridge-formation.html
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