2023-11-14 17:01:23
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[EN VIDÉO] 133 days on our Sun After almost 13 years of good and loyal service, the Solar Dynamics Observatory (SDO,…
When the Northern Lights light up our sky, it is because charged particles coming from our SunSun have interacted with the atomsatoms and moleculesmolecules of our atmosphereatmosphere. It’s a little less known — and much less spectacular — but, in their precipitation, these particles can also generate intense radio emissions at frequencies of the order of a few hundred kilohertz.
Today, however, it is not in the atmosphere of our Earth that the phenomenon was recorded, but in that of our Sun, directly above a region of sunspots. A radio broadcast that persisted for more than a week and at frequencies ranging from hundreds of thousands to regarding a million kilohertz, reflecting the fact that the magneticfieldmagnetic field of a sunspotsunspot is much stronger than that of our Planet.
A radio broadcast from an intriguing sunspot
“This is totally different from typical transient solar radio bursts which usually last a few minutes or hours. This is an exciting discovery that might potentially change our understanding of stellar magnetic processes.”says Sijie Yu, researcher at New Jersey Institute of Technology (United States) and lead author of the study published in the journal Nature Astronomyin a communiqué.
According to astronomersastronomers, the phenomenon is due to a stimulated cyclotroncyclotron emission involving energetic electrons in gyratory motion (ECM). The colder, intensely magnetic areas of sunspots would provide a favorable environment for this type of emissions.
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