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Solar Orbiter has made the first ever remote sensing observation of a magnetic phenomenon called a solar ‘switchback’, proving their origin in the solar surface and pointing to a mechanism that might help accelerate the solar wind.
The central image shows the Sun as seen by the ESA/NASA Solar Orbiter spacecraft’s Extreme Ultraviolet Imager (EUI) instrument on 25 March 2022. An active region on the Sun is indicated, which is thought to be the source of the observed ‘switchback’ identified in the solar corona by the Metis instrument.
An analysis of the outflow velocity in the corona shows that the switchback corresponds to very slow-moving plasma (image at right). This links it to the active region as such slow speeds would be expected above an active region that has yet to release its stored energy.
The magnetic field line sketches show the chain of events that are thought to be taking place in the magnetic field lines to generate the switchback. Active regions on the Sun can feature open and closed magnetic field lines. The closed lines arch up into the solar atmosphere before curving round back into the Sun. The open field lines connect with the interplanetary magnetic field of the Solar System. When an open magnetic region interacts with a closed region, the magnetic field lines can reconnect, creating an approximately S-shape field line and producing a burst of energy. As the field line responds to the reconnection and the release of energy, a kink is set propagating outwards. This is the switchback. A similar switchback is also sent in the opposite direction, down the field line and into the Sun.
This is the first ever remote sensing observation of a switchback, and may provide a mechanism that might help accelerate the solar wind.
Credits: ESA & NASA/Solar Orbiter/EUI & Metis Teams and D. Telloni et al. (2022); Zank et al. (2020)
There are more of these Zen Brush paintings on my website at sites.google.com/site/dickpountainspages/home/zen-brush-p...
Here's another one of those aurora shots from the plane when flying home from Iceland.
When charged particles from the sun (solar wind) strike atoms in Earth's atmosphere, they cause electrons in the atoms to move to a higher-energy state. When the electrons drop back to a lower energy state, they release a photon: light. This process creates the beautiful aurora, or northern lights.
Earth has a magnetic field which stretches out for thousands of kilometres into space. It's this magnetic field that deflects harmful solar wind towards the poles. Without this deflective magnetic field the solar wind would simply strip the atmosphere from our planet, killing all life on Earth. It's a natural defence mechanism protecting us from the devastating effects of our Sun.
To sit there and witness this from this point of view was really fucking awesome. A dream come true.
Location: Malaysia
Size: 3 cm
Defense mechanism of this frog is not to jump/hop away when you touch it, it just curled up and fake death. How cute & colorful.
Our Ae 3/6 I looks slowly good on the ventilation side. Side walls are mounted. Doors and closing mechanism back in position and working.
The oil cooling pipes are still missing paint.
You might see at the backside the emergency ladder to reach the roof being folded out.
When the appointment ends, my therapist's office is always littered with paper cranes that I've folded from post-it notes.
I wonder if she knows I'm not listening.
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Pressing this button operates the mechanism to uncouple a selected model railroad train car. From my childhood, it is over 60 years old. Size: 1 5/8 by 2 5/8 inches.
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See more pics of the lago di garda on my blog.
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