Interstellar scintillation of PSR J0437-4715 on two scales

Aims. We sought to determine the scale of scintillation in the interstellar plasma of PSR J0437-4715. Methods. We used the Very Long Baseline Array to obtain scintillation amplitude and phase data, from dynamic spectra at 327 MHz. Results. We observe two scales of scintillation of pulsar PSR J0437-4715, differing by more than an order of magnitude in scintillation bandwidth. The wider-bandwidth scale of scintillation that we observe indicates less scattering for this pulsar than for other nearby pulsars, other than PSR B0950+08.