Research team reveals reconfiguration process of solar eruptions

Just lately, a analysis staff led by Prof. Gou Yanyu from the College of Science and Expertise of China (USTC) of the Chinese language Academy of Sciences (CAS) discovered that the solar outburst construction undergoes a posh reconfiguration evolution throughout the early outbursts. This is a vital development within the research of solar outburst exercise. This research was revealed in Nature Astronomy.

In classical photos, the core construction of a solar eruption is a magnetic rope consisting of spirally wound magnetic lines. When the eruption begins, the magnetic ropes across the core are reworked by magnetic reconnection into spirally wound magnetic traces, which wrap across the unique core, resulting in its fast development in a “snowball” style. Nonetheless, solely a couple of third of the solar ejecta detected by numerous near-Earth and interplanetary spacecraft in situ possessed the anticipated magnetic construction, whereas the remainder deviated considerably from classical photos.

By finding out a coronal mass ejection occasion, the researchers revealed that the pre-emergence magnetic rope construction underwent a posh collection of stripping, disintegration and reconstruction throughout the outburst. Observational proof instructed that the pre-burst S-shaped magnetic rope construction developed from small-scale “seeds.”

At the beginning of the outburst, the footpoints of the magnetic ropes are clearly outlined by a trapezoidal brilliant band within the decrease ambiance. In the course of the subsequent violent outburst, the footpoints of the outburst construction are manifested as darkened areas within the corona because of the absence of fabric.

With the extremely dynamic adjustments within the solar chromospheric flare band and the ensuing drift of the coronal darkening area, the footpoints of the eruptive construction shift dramatically, barely intersecting with the footpoints of the pre-eruptive magnetic rope. That is clearly in distinction with classical photos, which predicted that the coronal darkening area characterizing the footpoints of the eruptive construction ought to have coated the footpoints of the unique magnetic rope.

The top of the flare zone exhibits a extremely irregular sample and a back-and-forth sawing movement, revealing a posh three-dimensional magnetic reconnection inside the magnetic rope and between the magnetic rope and the encompassing area. These phenomena instructed that the three-dimensional magnetic area reconnection throughout the eruption replaces the magnetic flux of the unique magnetic rope virtually utterly.

This research reveals the small print of the method of complicated three-dimensional magnetic reconnection and its essential position within the formation of coronal mass ejections. It gives a brand new bodily rationalization for the technology of complicated ejection buildings in interplanetary space, and sheds gentle on space climate forecasting.