Sunspots

Want to find out more about Sunspots? Also the Solar Wind, Near Earth Objects, Meteor showers, Cosmic rays?

Try viewing https://spaceweather.com – today it has information and photos about the largest sunspot seen in years. The Sun has a solar cycle, it has a minimum and maximum activity over a period of 11 years. It is caused by the Sun’s magnetic activity. I can’t explain the science properly so have a look at the site.

It also shows information about Auroras and comets among other things, and it is understandable and not too technical.

https://spaceweather.com

Green skies

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The Aurora borealis is something I’ve never seen but always wanted to. When I see photos of it I’m amazed that electrons from the suns solar wind can cause such beauty.

The electrons and other particles travel along the magnetic lines of force at the North Pole (and South – the Aurora Australis I think it’s called). As they interact with the magnetic field they glow. The different colours denote different elements. I think Green is Nitrogen and Pink is Oxygen.

The Aurora occur at the poles because they are where the magnetic field is at its weakest and drops down towards the pole. If you have seen iron filings round a bar magnet you can see how the field curves round and down.

So what is solar wind? It is the matter that pours out from the sun when there is a hole in the corona (upper atmosphere of the sun). There are coronal mass ejections where the sun spews out masses of ionised electrons which interact with Earth’s atmosphere.

There is a lot more about aurora’s but my knowledge is not good enough to explain more.

 

Aurora

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“And what is Life?—An hour-glass on the run,
A mist retreating from the morning sun,
A busy, bustling, still repeated dream;
Its length?—A minute’s pause, a moment’s thought;
And happiness?—A bubble on the stream,
That in the act of seizing shrinks to nought.”

[From ‘What is Life?’ (1820) by John Clare]

I just read this quote and thought about what I would love to see. My friend recently visited Iceland and was lucky to see the aurora borealis. I decided to try and draw it since I haven’t had the opportunity to see one. I was surprised to find out they can be colours other than green which is caused by Nitrogen ions in the atmosphere. The pink is from Oxygen.

The magnetic North Pole of the Earth is drifting towards the actual North Pole at several kilometers a year. There is speculation about what is causing this. But as the Earth’s has a molten iron core it causes a magnetic feild generated by the movement of the Iron. The earth’s magnetic feild may flip (it has before) and so the aurora may drift further south.

The magnetic feild lines emerge from the poles like a bar magnet. This is where the Earth’s magnetosphere is at its weakest and the solar wind, which is made up of charged particles, comes down the magnetic lines and causes the gases in atmosphere to glow.

I wish I had more knowledge about it and I hope one day I will see it.