Tag

Dynamo

All articles tagged with #dynamo

science4 days ago•61 min saved

Sun's Magnetic Field Wobbles in Midlife, Puzzles Scientists

New observations and simulations suggest that sun‑like stars, including our Sun, undergo a magnetic‑crisis in mid‑life: their global magnetic field weakens as dynamos slow and may shift from complex to simpler configurations before possibly reviving later. This impacts how stars spin, the space weather they produce, and the habitability of surrounding planets; researchers debate whether the field is truly collapsing or entering a temporary minimum, with implications for interpreting exoplanet biosignatures as NASA's Habitable Worlds Observatory searches for life‑bearing worlds.

via Yahoo|

#dynamo #gyrochronology #science

science1 month ago•12 min saved

Mars's Lost Dynamo: From a Wetter World to a Frozen Desert

Mars once had a global magnetic field strong enough to shield its atmosphere from the solar wind, but when the dynamo faded around four billion years ago the atmosphere and surface water were gradually stripped away by solar wind over hundreds of millions to billions of years, turning Mars from a possibly habitable world into the current cold desert; the loss was slow and interlinked with interior cooling and crustal water sequestration, with MAVEN confirming ongoing atmospheric loss today.

via Space Daily|

#atmosphere #dynamo #magnetic-field

space-and-spaceflight3 months ago•17 min saved

Ganymede’s Forming Core Sparks a New Dynamo Theory

A Science Advances study suggests Ganymede’s metallic core is still forming today, and that ongoing convection in this migrating, hot iron core powers its long-unique magnetic field via a ‘cold-start’ dynamo; the results don’t fully overturn older theories, but they offer a new mechanism to explain why Ganymede’s dynamo persists while Callisto shows no obvious one, with implications for Europa and future data from Europa Clipper and Juice.

via Gizmodo|

#core #dynamo #ganymede

space3 months ago•58 min saved

Ganymede’s hidden heat may power a late-forming magnetic dynamo

New Science Advances study suggests Jupiter’s moon Ganymede could have formed a metal core later than previously thought and still sustain a magnetic field via a warming-driven dynamo powered by protracted core formation, radioactive heating, and tidal forces. This challenges the idea that dynamos always originate early and cool over time, and implies Ganymede’s magnetism—potentially active today—arises from a “warm start” process that could influence how we think about magnetic fields on other worlds, including exoplanets.

via Live Science|

#dynamo #ganymede #jupiter