Researchers say the novel radio emission shares characteristics with the auroral radio emissions commonly seen in planetary magnetospheres such as those around Earth, Jupiter and Saturn, as well as certain low-mass stars.
The discovery offers new insights into the origin of such intense solar radio bursts and potentially opens new avenues for understanding similar phenomena in distant stars with large starspots, according to the study’s lead author and NJIT-CSTR scientist, Sijie Yu.
“We’ve detected a peculiar type of long-lasting polarized radio bursts emanating from a sunspot, persisting for over a week,” said Yu. “This is quite unlike the typical, transient solar radio bursts typically lasting minutes or hours. It’s an exciting discovery that has the potential to alter our comprehension of stellar magnetic processes.”
Famous auroral light shows that are visible across the sky of Earth’s polar regions, like the Aurora Borealis or Aurora Australis, occur as solar activities disturb Earth’s magnetosphere, which facilitates the precipitation of charged particles to the Earth’s polar region where the magnetic field converges, and interacts with oxygen and nitrogen atoms in the high atmosphere. Accelerating toward the north and south poles, such electrons can generate intense radio emissions at frequencies around a few hundred kHz.
Yu’s team says the newly observed solar radio emissions, detected over a vast sunspot region temporarily forming where magnetic fields on the Sun’s surface are particularly strong, differ from previously known solar radio noise storms — both spectrally and temporally.
“Our spatially, temporally and spatially resolved analysis…