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Create an artificial surface containing a Gaussian mound:

r.surf.volcano out=gauss method=gaussian kurtosis=1

Time step

The following three images demonstrate the effects of using different step parameters.

r.sun -s elevin="gauss" glob_rad="rad.global.30minT" day=180
r.sun -s elevin="gauss" glob_rad="rad.global.15minT" day=180
r.sun -s elevin="gauss" glob_rad="rad.global.03minT" day=180

Default 30 minute time step.

15 minute time step.

3 minute time step.

The 3 minute time step takes roughly ten times as long to run as the 30 minute timestep.