Image: SDO spies broad coronal hole

Image: SDO spies broad coronal hole
Credit: NASA

A broad hole in the corona was the sun's dominant feature November 7-9, 2017, as shown in this image from NASA's Solar Dynamics Observatory. The hole is easily recognizable as the dark expanse across the top of the sun and extending down in each side.

Coronal holes are magnetically open areas on the sun that allow high-speed solar wind to gush out into space.

They always appear darker in . This one was likely the source of bright aurora that shimmered for numerous observers, with some reaching down even to Nebraska.


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Image: NASA's SDO peers into huge coronal hole

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Citation: Image: SDO spies broad coronal hole (2017, November 21) retrieved 22 September 2019 from https://phys.org/news/2017-11-image-sdo-spies-broad-coronal.html
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Nov 21, 2017
Coronal holes are magnetically open areas on the sun that allow high-speed solar wind to gush out into space.

"Magnetically open" is pseudoscientific speak for electric currents "gushing" into space. Of course there is nothing "magnetically open" as all magnetic fields are closed loops of flux.

RNP
Nov 21, 2017
@cantdrive85
In this case, "open" field lines simply means that the field lines originate, but do not terminate, on the Sun. Instead they connect with magnetic fields elsewhere, often the magnetopause. I am surprised you did not know this considering your purported expertise in this field.

Nov 21, 2017
No matter how hard you guys want to claim magnetism without the causative electricity as being scientific it is still just pseudoscience. There is no "open magnetic fields", there is an electric current flowing out of the Sun at the coronal holes. Stop eith the pseudoscience already.

RNP
Nov 21, 2017
@cantdrive85
You really do not understand magnetism at all do you? Yes, magnetic fields are often (but not always) cause by electric currents, but they can exist in regions in which currents are not flowing. Didn't you realise this?

For example, ferromagnets generate magnetic fields without there being a current flowing ANYWHERE.

Nov 21, 2017
You really do not understand magnetism at all do you? Yes, magnetic fields are often (but not always) cause by electric currents, but they can exist in regions in which currents are not flowing. Didn't you realise this?
For example, ferromagnets generate magnetic fields without there being a current flowing ANYWHERE.

Let's try to stay on point, we are discussing magnetic fields innplasmas, not bar magnets. Regardless, ferromagnets are created by a spin current.
In plasmas, there must be a current or a changing electric field as plasmas are not ferromagnetic. Still, all magnetic lines of flux are closed loops per Maxwell's equations, it's a simple fact that is indisputable. Claiming the magnetic fields are "open" or connected elsewhere is pure pseudoscientific mumbo jumbo, which you along with da schnied and barakn seem to have not compunction at disseminating. There are no magnetic monpoles except in the minds of astrophysicists and morons.


RNP
Nov 22, 2017
@cantdrive85
More epic failure to understand the physics you are trying to talk about.
Let's try to stay on point, we are discussing magnetic fields innplasmas, not bar magnets.

This is irrelevant, the Suns magnetic field would be present even were it suspended in a pure vacuum.
Regardless, ferromagnets are created by a spin current.

No, they are not. You had better learn a little more physics if you do not want to embarrass yourself like this.
In plasmas, there must be a current or a changing electric field as plasmas are not ferromagnetic.

The currents generating the Suns magnetic field are *within the Sun* and produce a field very similar to that of a bar magnet.
Claiming the magnetic fields are "open" or connected elsewhere is pure pseudoscientific mumbo jumbo.

Just because you do not understand it does not make it "pseudoscientific mumbo jumbo", it just means that you lack the education needed to post anything of value on the subject.


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