A sexual pervert who exposed himself to a female jogger in Melbourne's north may find his own identity exposed after the quick-thinking woman whipped out her mobile phone and snapped a photograph of him.

The image, which reveals the face of the flasher, has been released by police in a bid to track down the offender who is believed to have targeted another woman in similar circumstances on the same day.

Say cheese .... The woman snapped this picture after being flashed. Credit:Victoria Police

Police said the 38-year-old woman, from Coburg, was jogging along the Merri Creek Trail at the rear of the CERES Community Environment Park when she stopped to stretch about 1.35pm on Sunday.

A man rode past her on a red bicycle, before he turned around and rode past her a second time.