According to a new study, scientists have pinpointed a solar radio burst in the Sun's atmosphere that exhibits a signal pattern similar to that of a heartbeat. An international team of researchers has published their discovery of the source location of a radio signal emanating from a C-class sola
An illustration showing EOVSA capturing a pulsating radio burst from a solar flare. Credit: Sijie Yu of NJIT/CSTR; Yuankun Kou of NJU; NASA SDO/AIA
“The discovery is unexpected,” said Sijie Yu, the study’s corresponding author and astronomer affiliated withCenter for Solar-Terrestrial Research. “This beating pattern is important for understanding how energy is released and is dissipated in the Sun’s atmosphere during these incredibly powerful explosions on the Sun. However, the origin of these repetitive patterns, also called quasi-periodic pulsations, has long been a mystery and a source of debate among solar physicists.
EOVSA routinely observes the Sun in a wide range of microwave frequencies over 1 to 18 gigahertz and is sensitive to radio radiation emitted by high-energy electrons in the Sun’s atmosphere, which are energized in solar flares. “The signals likely originate from quasi-repetitive magnetic reconnections at the flare current sheet,” added Yu. “This is the first time a quasi-periodic radio signal located at the reconnection region has been detected. This detection can help us to determine which of the two sources caused the other one.”
Continuing their investigation, the team members combined 2.5D numerical modeling of the solar flare, led by the other corresponding author of the paper and professor of astronomy Xin Cheng at NJU, with observations of soft X-ray emission from the solar flares observed by’s GOES satellite, which measures the soft X-ray fluxes from the Sun’s atmosphere in two different energy bands.
“The appearance of magnetic islands within the long-stretched current sheet plays a key role in tweaking the energy release rate during this eruption,” explained Cheng. “Such a quasi-periodic energy release process leads to a repeating production of high-energy electrons, manifesting as QPPs in the microwave and soft X-ray wavelengths.”
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