I found this picture of colorful aurora in my friend's social media account. I think that this picture will be a good alternative for your desktop background. Furthermore, the picture was edited in order to get the best aspect ratio. Currently, the picture has a resolution of 1920x1080 pixels. This resolution also known as Full HD or HD. HD pictures will be exactly suitable for widescreen monitors. So, for best result, you can download this picture in original size.
There are two types of Aurora: The Aurora Borealis (Northern Lights) and Aurora Australis (Southern Lights). Both of them are the result of electrons colliding with the upper reaches of Earth's atmosphere. The colors most often associated with the Aurora Borealis are pink, green, yellow, blue, violet, orange and white. Commonly, when the particles collide with oxygen, the colors are yellow and green. While interactions with nitrogen produce red, violet, and occasionally blue colors. The Aurora Australis takes the shape of a curtain of light, or a sheet, or a diffuse glow; it most often is green, sometimes red.
I hope that this wallpaper will be one of your choice to customize your desktop background. Furthermore, you can also browse for more pictures of Aurora on this site by visiting the gallery below: