Researchers Map Solar Corona's Magnetic Field in Three Dimensions
A research team has produced the first global, three-dimensional estimates of the sun's outer magnetic field by applying a new inversion technique to existing observations from the Mauna Loa Solar Observatory. By decoding light and waves traveling through the corona, the method bypasses previous limitations in measuring the sun's full magnetic structure. While the initial maps have limitations and require further validation, the openly available technique represents a step toward more accurate models of solar activity and space weather predictions.
Geomagnetic Superstorm Accelerates Electrons Within Van Allen Belts
Researchers analyzing data from Japan's Arase space probe found that the May 2024 geomagnetic superstorm triggered the local acceleration of ultrarelativistic electrons well inside Earth's traditionally impenetrable radiation barrier. Rather than migrating inward from outer belts, these multi-megaelectronvolt electrons gained energy locally due to prolonged low-plasma density and intense chorus-wave activity following the severe space weather event. The findings highlight that near-Earth space environments can experience substantial radiation enhancements during extreme solar conditions.
Simulations Link Atmospheric Shock Waves to Exoplanet Migration
Using detailed simulations, astronomers demonstrated how giant gaseous exoplanets could migrate from distant elliptical orbits into tight, circular paths around host stars by releasing energy through supersonic shock waves in their outer atmospheres. The models showed that shallow shocks allow gas giants to retain their mass, matching the observed hot Jupiter pileup and Neptune ridge, whereas deeper shocks strip planetary envelopes and could explain barren cores or the Neptune desert. Further telescope observations are needed to test these migration predictions.
Written with AI from original reports. Source names and report dates are shown with each story.
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