I have another method;
1. Render: Clouds: Scale:250 Roughness:0.
2. Duplicate layer. Blend mode: Negation
3. Add new layer.
4. Repeat steps 1 and 2. Set blend mode to Multiply.
5. Add new layer.
6. Repeat steps 1 and 2.
7. Blend mode: Normal, Opacity:145.
8. Flatten.
9. Curves.Like this:
10. Distort: Dents: Scale:110 Amount:50 Stretch: Amount:10 Angle:90.
11. Add new layer.
12. Make a gradient like this:
13. Set blend mode to Glow.
14. Flatten.
15. Blurs: Motion Blur: Angle: 90 Distance: 10
Now you should have something like this: