Blackbody (Fire Color)

First, create a new image 200x200 pixels. Use the paintbucket tool to paint the background to black color, so your image will be black color.

Go to Filter>Render>Lens Flare, follow the options below:

Then go to Filter>Stylize>Wind, follow the options below: Method: Wind Direction: From the right

Apply the effects 5 times (or hold down CTRL+F 5 times)

Go to Image>Mode>Grayscale, click OK Then Image>Mode>Indexed Color. Then Image>Mode>Color Table. Follow the options below:

After that click OK!

Then you have this:

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