There are actually many ways that this effect might be done. This is just one way.
Use your Brush Tool to create a few tapered strokes.
Duplicate this layer and rotate using Free Transform (Cmd/Cntrl + T). You can reposition the center pivot point by holding down the Opt/Alt key and click where you want the pivot.
Now you have two layers. Highlight the two layers and duplicate (Cmd/Cntrl + J), then hit Cmd/Cntrl + E to merge. Rotate this layer as described above.
Repeat the process until satisfied.
Once you have the layers looking like you want, you can now merge them all or make a stamp visible layer (Turn of any background, Select/highlight uppermost active layer, Shift + Opt/Alt + Cmd/Cntrl + E).
You can create a brush from this by adding back a white background layer or use it just as it is.
You can now convert the wheel into a smart object (Right click layer and choose "convert to smart object")
Add a smart filter - Gaussian Blur
Add a layer Style set to color overlay
Lower opacity
Add a layer mask and a radial gradient..
This was created very fast as a quick example, so it's not exact!!!!
I will try to post some other methods if no one else jumps in.