The solar is the only star that we can easily observe, it emitted abundance of its energy, which includes full of various activities such as solar flares, solar jets, solar winds,
filament eruption, coronal mass ejections, and large scale extreme ultraviolet (EUV)
waves. The vast majority of energy on earth comes from the solar, and solar eruptive
activities are closely related to the safe of earth. eg, High-energy particles emitted by
the solar can reach the earth to form beautiful auroras, and the eruption on the solar are
the main source of catastrophic space weather on earth. In older to forecast them accurately, it is of great importance for the earth to study the physical mechanisms of solar
activity. The eruption of the filament on the sun are the main material source of space
weather, and their eruption mechanisms have been widely studied by researchers. The
physical linkage of the sympathetic filament eruption has also attracted the researchers,
recently. It is unclear whether successive filament eruptions at different sites within a short
time interval are physically connected or not. Here, we present the observations of suc-
cessive eruptions of a small and a large filament in a tripolar magnetic field region whose
coronal magnetic field showed as a fan-spine magnetic system. By analyzing the multi-wavelength observations taken by the Solar Dynamic Observatory and the extrapolated
three-dimensional coronal magnetic field, we find that the two filaments resided respectively in the two lobes that make up the inner fan structure of the fan-spine magnetic
system. In addition, a small fan-spine system was also revealed by the squashing factor
Q map, which located in the east lobe of the fan structure of the large fan-spine system.
The eruption of the small filament was a failed filament eruption, which did not cause
any coronal mass ejection (CME) except for three flare ribbons and two post-flare-loop
systems connecting the three magnetic polarities. The eruption of the large filament not
only caused similar post-flare-loop systems and flare ribbons, as observed in the small
filament eruption, but also a large-scale CME. Based on our analysis results, we conclude that the two successive filament eruptions were physically connected, in which the topology change caused by the small filament eruption is thought to be the physical
linkage. In addition, the eruption of the small fan-spine structure further accelerated the
instability and violent eruption of the large filament. Lots of solar activities still remain unsolved. To find the answers out, we may need
hegher resolution solar telescopes and simulations.
修改评论