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The anomalous state of Uranus's magnetosphere during the Voyager 2 flyby.
Nat Astron
November 2024
NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA USA.
The Voyager 2 flyby of Uranus in 1986 revealed an unusually oblique and off-centred magnetic field. This single in situ measurement has been the basis of our interpretation of Uranus's magnetosphere as the canonical extreme magnetosphere of the solar system; with inexplicably intense electron radiation belts and a severely plasma-depleted magnetosphere. However, the role of external forcing by the solar wind has rarely been considered in explaining these observations.
View Article and Find Full Text PDFA highly magnetized long-period radio transient exhibiting unusual emission features.
Sci Adv
January 2025
Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
Long-period radio transients are a new class of astrophysical objects that exhibit periodic radio emission on timescales of tens of minutes. Their true nature remains unknown; possibilities include magnetic white dwarfs, binary systems, or long-period magnetars; the latter class is predicted to produce fast radio bursts (FRBs). Using the MeerKAT radio telescope, we conducted follow-up observations of the long-period radio transient GPM J1839-10.
View Article and Find Full Text PDFMagnetospheric origin of a fast radio burst constrained using scintillation.
Nature
January 2025
Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada.
Article Synopsis
- Fast radio bursts (FRBs) are brief bursts of radio waves from distant galaxies, and their emission mechanisms are still debated, focusing on processes near a central engine versus shocks at large distances.
- Researchers measured two scintillation scales for FRB 20221022A, one linked to the Milky Way and the other to its host galaxy, which allowed them to determine the FRB's emission region size to be less than 3 x 10 kilometers.
- This size contradicts the large-distance model and suggests that the emission likely occurs close to a central compact object, supported by an observed S-shaped polarization angle, indicating a magnetospheric emission process.
A pulsar-like polarization angle swing from a nearby fast radio burst.
Nature
January 2025
Perimeter Institute for Theoretical Physics, Waterloo, Ontario, Canada.
Article Synopsis
- Fast radio bursts (FRBs) are intense signals from deep space that last for milliseconds and share some characteristics with pulsars, suggesting they may originate from neutron stars.
- Despite similarities, FRBs like 20221022A display different patterns in their linear polarization position angle (PA), particularly a 130° rotation that aligns with pulsar behaviors, hinting at magnetospheric origins.
- This study rules out short-period pulsars as potential sources for FRB 20221022A, supporting the idea that its unique PA evolution fits the rotating vector model commonly used for pulsars.
Jets Downstream of Collisionless Shocks: Recent Discoveries and Challenges.
Space Sci Rev
December 2024
Space Research Institute, Austrian Academy of Sciences, Schmiedlstraße 6, Graz, 8042 Austria.
Plasma flows with enhanced dynamic pressure, known as magnetosheath jets, are often found downstream of collisionless shocks. As they propagate through the magnetosheath, they interact with the surrounding plasma, shaping its properties, and potentially becoming geoeffective upon reaching the magnetopause. In recent years (since 2016), new research has produced vital results that have significantly enhanced our understanding on many aspects of jets.
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