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#solarwind

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[On the origin of slow and fast solar winds] In late 2022 - early 2023, ESA's #SolarOrbiter probe orbited in relative proximity to the #Sun - less than 50 million kilometers away, enabling the onboard instruments to capture high-resolution images of #jets in coronal holes and make direct measurements of the solar wind.

These jets, omnipresent in the dark regions of the solar atmosphere, have been shown to be a source of both slow and fast #SolarWind: for almost a minute, they project charged particles at a speed of 100 km/sec.

Info+ : esa.int/ESA_Multimedia/Videos/

Continued thread

Earth remains under the influence of a waning high-speed #SolarWind ☀️ stream. No Earth-directed coronal mass ejections (#CMEs) were observed over the past 24 hours. Earth’s #geomagnetic field 🌐 was unsettled to active over the past day. earthsky.org/sun/sun-news-acti

EarthSky | Updates on your cosmos and world · Sun news: Sun flaring low. Auroras’ last gasp?

“Magic of the North”

Fires glow above and below in this award-winning image from photographer Josh Beames. In the foreground, lava from an Icelandic eruption spurts into the air and seeps across the landscape as it slowly cools. Above, the northern aurora ripples through the night sky, marking the dance of high-energy particles streaming into our atmosphere, guided by the lines of our magnetic field. Throw in some billowing turbulent smoke, and it’s hard to get more fluid dynamical (or beautiful!) than this. (Image credit: J. Beames/NLPOTY; via Colossal)

Switchback Patches Evolve into Microstreams via Magnetic Relaxation: iopscience.iop.org/article/10. -> When Solar Probes Align - Data Confirms the Sun’s Magnetic Field Accelerates #SolarWind: clasp.engin.umich.edu/2024/12/ - a new study led by University of Michigan researchers published in The Astrophysical Journal confirms the sun’s magnetic field accelerates solar wind as it relaxes.

iopscience.iop.orgRadware Bot Manager Captcha

Reinterpreting Uranus’s Magnetosphere

NASA launched the Voyager 2 probe nearly 50 years ago, and, to date, it’s the only spacecraft to visit icy Uranus. This ice giant is one of our oddest planets — its axis is tilted so that it rotates on its side! — but a new interpretation of Voyager 2’s data suggests it’s not quite as strange as we’ve thought. Initially, Voyager 2’s data on Uranus’s magnetosphere suggested it was a very extreme place. Unlike other planets, it had energetic energy belts but no plasma. Now researchers have explained Voyager 2’s observations differently: they think the spacecraft arrived just after an intense solar wind event compressed Uranus’s magnetosphere, warping it to an extreme state. Their estimates suggest that Uranus would experience this magnetosphere state less than 5% of the time. But since Voyager 2’s data point is, so far, our only look at the planet, we just assumed this extreme was normal. (Image credit: NASA; research credit: J. Jasinski et al.; via Gizmodo)